July 2022 - Linux-stable-mirror

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 5.18-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

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FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 5.15-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

1
0
0 0

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 5.10-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

1
0
0 0

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

1
0
0 0

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

1
0
0 0

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

1
0
0 0

FAILED: patch "[PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct" failed to apply to 4.9-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From b5d281f6c16dd432b618bdfd36ddba1a58d5b603 Mon Sep 17 00:00:00 2001 From: Christian Marangi <ansuelsmth(a)gmail.com> Date: Mon, 20 Jun 2022 00:03:51 +0200 Subject: [PATCH] PM / devfreq: Rework freq_table to be local to devfreq struct On a devfreq PROBE_DEFER, the freq_table in the driver profile struct, is never reset and may be leaved in an undefined state. This comes from the fact that we store the freq_table in the driver profile struct that is commonly defined as static and not reset on PROBE_DEFER. We currently skip the reinit of the freq_table if we found it's already defined since a driver may declare his own freq_table. This logic is flawed in the case devfreq core generate a freq_table, set it in the profile struct and then PROBE_DEFER, freeing the freq_table. In this case devfreq will found a NOT NULL freq_table that has been freed, skip the freq_table generation and probe the driver based on the wrong table. To fix this and correctly handle PROBE_DEFER, use a local freq_table and max_state in the devfreq struct and never modify the freq_table present in the profile struct if it does provide it. Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device") Cc: stable(a)vger.kernel.org Signed-off-by: Christian Marangi <ansuelsmth(a)gmail.com> Signed-off-by: Chanwoo Choi <cw00.choi(a)samsung.com> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 80a1235ef8fb..9602141bb8ec 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -123,7 +123,7 @@ void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq, unsigned long *max_freq) { - unsigned long *freq_table = devfreq->profile->freq_table; + unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; lockdep_assert_held(&devfreq->lock); @@ -133,11 +133,11 @@ void devfreq_get_freq_range(struct devfreq *devfreq, * The devfreq drivers can initialize this in either ascending or * descending order and devfreq core supports both. */ - if (freq_table[0] < freq_table[devfreq->profile->max_state - 1]) { + if (freq_table[0] < freq_table[devfreq->max_state - 1]) { *min_freq = freq_table[0]; - *max_freq = freq_table[devfreq->profile->max_state - 1]; + *max_freq = freq_table[devfreq->max_state - 1]; } else { - *min_freq = freq_table[devfreq->profile->max_state - 1]; + *min_freq = freq_table[devfreq->max_state - 1]; *max_freq = freq_table[0]; } @@ -169,8 +169,8 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) { int lev; - for (lev = 0; lev < devfreq->profile->max_state; lev++) - if (freq == devfreq->profile->freq_table[lev]) + for (lev = 0; lev < devfreq->max_state; lev++) + if (freq == devfreq->freq_table[lev]) return lev; return -EINVAL; @@ -178,7 +178,6 @@ static int devfreq_get_freq_level(struct devfreq *devfreq, unsigned long freq) static int set_freq_table(struct devfreq *devfreq) { - struct devfreq_dev_profile *profile = devfreq->profile; struct dev_pm_opp *opp; unsigned long freq; int i, count; @@ -188,25 +187,22 @@ static int set_freq_table(struct devfreq *devfreq) if (count <= 0) return -EINVAL; - profile->max_state = count; - profile->freq_table = devm_kcalloc(devfreq->dev.parent, - profile->max_state, - sizeof(*profile->freq_table), - GFP_KERNEL); - if (!profile->freq_table) { - profile->max_state = 0; + devfreq->max_state = count; + devfreq->freq_table = devm_kcalloc(devfreq->dev.parent, + devfreq->max_state, + sizeof(*devfreq->freq_table), + GFP_KERNEL); + if (!devfreq->freq_table) return -ENOMEM; - } - for (i = 0, freq = 0; i < profile->max_state; i++, freq++) { + for (i = 0, freq = 0; i < devfreq->max_state; i++, freq++) { opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &freq); if (IS_ERR(opp)) { - devm_kfree(devfreq->dev.parent, profile->freq_table); - profile->max_state = 0; + devm_kfree(devfreq->dev.parent, devfreq->freq_table); return PTR_ERR(opp); } dev_pm_opp_put(opp); - profile->freq_table[i] = freq; + devfreq->freq_table[i] = freq; } return 0; @@ -246,7 +242,7 @@ int devfreq_update_status(struct devfreq *devfreq, unsigned long freq) if (lev != prev_lev) { devfreq->stats.trans_table[ - (prev_lev * devfreq->profile->max_state) + lev]++; + (prev_lev * devfreq->max_state) + lev]++; devfreq->stats.total_trans++; } @@ -835,6 +831,9 @@ struct devfreq *devfreq_add_device(struct device *dev, if (err < 0) goto err_dev; mutex_lock(&devfreq->lock); + } else { + devfreq->freq_table = devfreq->profile->freq_table; + devfreq->max_state = devfreq->profile->max_state; } devfreq->scaling_min_freq = find_available_min_freq(devfreq); @@ -870,8 +869,8 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->stats.trans_table = devm_kzalloc(&devfreq->dev, array3_size(sizeof(unsigned int), - devfreq->profile->max_state, - devfreq->profile->max_state), + devfreq->max_state, + devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { mutex_unlock(&devfreq->lock); @@ -880,7 +879,7 @@ struct devfreq *devfreq_add_device(struct device *dev, } devfreq->stats.time_in_state = devm_kcalloc(&devfreq->dev, - devfreq->profile->max_state, + devfreq->max_state, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { @@ -1666,9 +1665,9 @@ static ssize_t available_frequencies_show(struct device *d, mutex_lock(&df->lock); - for (i = 0; i < df->profile->max_state; i++) + for (i = 0; i < df->max_state; i++) count += scnprintf(&buf[count], (PAGE_SIZE - count - 2), - "%lu ", df->profile->freq_table[i]); + "%lu ", df->freq_table[i]); mutex_unlock(&df->lock); /* Truncate the trailing space */ @@ -1691,7 +1690,7 @@ static ssize_t trans_stat_show(struct device *dev, if (!df->profile) return -EINVAL; - max_state = df->profile->max_state; + max_state = df->max_state; if (max_state == 0) return sprintf(buf, "Not Supported.\n"); @@ -1708,19 +1707,17 @@ static ssize_t trans_stat_show(struct device *dev, len += sprintf(buf + len, " :"); for (i = 0; i < max_state; i++) len += sprintf(buf + len, "%10lu", - df->profile->freq_table[i]); + df->freq_table[i]); len += sprintf(buf + len, " time(ms)\n"); for (i = 0; i < max_state; i++) { - if (df->profile->freq_table[i] - == df->previous_freq) { + if (df->freq_table[i] == df->previous_freq) len += sprintf(buf + len, "*"); - } else { + else len += sprintf(buf + len, " "); - } - len += sprintf(buf + len, "%10lu:", - df->profile->freq_table[i]); + + len += sprintf(buf + len, "%10lu:", df->freq_table[i]); for (j = 0; j < max_state; j++) len += sprintf(buf + len, "%10u", df->stats.trans_table[(i * max_state) + j]); @@ -1744,7 +1741,7 @@ static ssize_t trans_stat_store(struct device *dev, if (!df->profile) return -EINVAL; - if (df->profile->max_state == 0) + if (df->max_state == 0) return count; err = kstrtoint(buf, 10, &value); @@ -1752,11 +1749,11 @@ static ssize_t trans_stat_store(struct device *dev, return -EINVAL; mutex_lock(&df->lock); - memset(df->stats.time_in_state, 0, (df->profile->max_state * + memset(df->stats.time_in_state, 0, (df->max_state * sizeof(*df->stats.time_in_state))); memset(df->stats.trans_table, 0, array3_size(sizeof(unsigned int), - df->profile->max_state, - df->profile->max_state)); + df->max_state, + df->max_state)); df->stats.total_trans = 0; df->stats.last_update = get_jiffies_64(); mutex_unlock(&df->lock); diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 69e06725d92b..406ef79c0c46 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -144,18 +144,18 @@ static int get_target_freq_with_devfreq(struct devfreq *devfreq, goto out; /* Use interpolation if required opps is not available */ - for (i = 0; i < parent_devfreq->profile->max_state; i++) - if (parent_devfreq->profile->freq_table[i] == *freq) + for (i = 0; i < parent_devfreq->max_state; i++) + if (parent_devfreq->freq_table[i] == *freq) break; - if (i == parent_devfreq->profile->max_state) + if (i == parent_devfreq->max_state) return -EINVAL; - if (i < devfreq->profile->max_state) { - child_freq = devfreq->profile->freq_table[i]; + if (i < devfreq->max_state) { + child_freq = devfreq->freq_table[i]; } else { - count = devfreq->profile->max_state; - child_freq = devfreq->profile->freq_table[count - 1]; + count = devfreq->max_state; + child_freq = devfreq->freq_table[count - 1]; } out: diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index dc10bee75a72..34aab4dd336c 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -148,6 +148,8 @@ struct devfreq_stats { * reevaluate operable frequencies. Devfreq users may use * devfreq.nb to the corresponding register notifier call chain. * @work: delayed work for load monitoring. + * @freq_table: current frequency table used by the devfreq driver. + * @max_state: count of entry present in the frequency table. * @previous_freq: previously configured frequency value. * @last_status: devfreq user device info, performance statistics * @data: Private data of the governor. The devfreq framework does not @@ -185,6 +187,9 @@ struct devfreq { struct notifier_block nb; struct delayed_work work; + unsigned long *freq_table; + unsigned int max_state; + unsigned long previous_freq; struct devfreq_dev_status last_status;

2 years, 6 months

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FAILED: patch "[PATCH] net: phy: Don't trigger state machine while in suspend" failed to apply to 5.4-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 1758bde2e4aa5ff188d53e7d9d388bbb7e12eebb Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas(a)wunner.de> Date: Tue, 28 Jun 2022 12:15:08 +0200 Subject: [PATCH] net: phy: Don't trigger state machine while in suspend Upon system sleep, mdio_bus_phy_suspend() stops the phy_state_machine(), but subsequent interrupts may retrigger it: They may have been left enabled to facilitate wakeup and are not quiesced until the ->suspend_noirq() phase. Unwanted interrupts may hence occur between mdio_bus_phy_suspend() and dpm_suspend_noirq(), as well as between dpm_resume_noirq() and mdio_bus_phy_resume(). Retriggering the phy_state_machine() through an interrupt is not only undesirable for the reason given in mdio_bus_phy_suspend() (freezing it midway with phydev->lock held), but also because the PHY may be inaccessible after it's suspended: Accesses to USB-attached PHYs are blocked once usb_suspend_both() clears the can_submit flag and PHYs on PCI network cards may become inaccessible upon suspend as well. Amend phy_interrupt() to avoid triggering the state machine if the PHY is suspended. Signal wakeup instead if the attached net_device or its parent has been configured as a wakeup source. (Those conditions are identical to mdio_bus_phy_may_suspend().) Postpone handling of the interrupt until the PHY has resumed. Before stopping the phy_state_machine() in mdio_bus_phy_suspend(), wait for a concurrent phy_interrupt() to run to completion. That is necessary because phy_interrupt() may have checked the PHY's suspend status before the system sleep transition commenced and it may thus retrigger the state machine after it was stopped. Likewise, after re-enabling interrupt handling in mdio_bus_phy_resume(), wait for a concurrent phy_interrupt() to complete to ensure that interrupts which it postponed are properly rerun. The issue was exposed by commit 1ce8b37241ed ("usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling"), but has existed since forever. Fixes: 541cd3ee00a4 ("phylib: Fix deadlock on resume") Link: https://lore.kernel.org/netdev/a5315a8a-32c2-962f-f696-de9a26d30091@samsung… Reported-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Tested-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Signed-off-by: Lukas Wunner <lukas(a)wunner.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Cc: stable(a)vger.kernel.org # v2.6.33+ Reviewed-by: Andrew Lunn <andrew(a)lunn.ch> Link: https://lore.kernel.org/r/b7f386d04e9b5b0e2738f0125743e30676f309ef.16564108… Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index ef62f357b76d..8d3ee3a6495b 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -31,6 +31,7 @@ #include <linux/io.h> #include <linux/uaccess.h> #include <linux/atomic.h> +#include <linux/suspend.h> #include <net/netlink.h> #include <net/genetlink.h> #include <net/sock.h> @@ -976,6 +977,28 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat) struct phy_driver *drv = phydev->drv; irqreturn_t ret; + /* Wakeup interrupts may occur during a system sleep transition. + * Postpone handling until the PHY has resumed. + */ + if (IS_ENABLED(CONFIG_PM_SLEEP) && phydev->irq_suspended) { + struct net_device *netdev = phydev->attached_dev; + + if (netdev) { + struct device *parent = netdev->dev.parent; + + if (netdev->wol_enabled) + pm_system_wakeup(); + else if (device_may_wakeup(&netdev->dev)) + pm_wakeup_dev_event(&netdev->dev, 0, true); + else if (parent && device_may_wakeup(parent)) + pm_wakeup_dev_event(parent, 0, true); + } + + phydev->irq_rerun = 1; + disable_irq_nosync(irq); + return IRQ_HANDLED; + } + mutex_lock(&phydev->lock); ret = drv->handle_interrupt(phydev); mutex_unlock(&phydev->lock); diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 431a8719c635..46acddd865a7 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -278,6 +278,15 @@ static __maybe_unused int mdio_bus_phy_suspend(struct device *dev) if (phydev->mac_managed_pm) return 0; + /* Wakeup interrupts may occur during the system sleep transition when + * the PHY is inaccessible. Set flag to postpone handling until the PHY + * has resumed. Wait for concurrent interrupt handler to complete. + */ + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 1; + synchronize_irq(phydev->irq); + } + /* We must stop the state machine manually, otherwise it stops out of * control, possibly with the phydev->lock held. Upon resume, netdev * may call phy routines that try to grab the same lock, and that may @@ -315,6 +324,20 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev) if (ret < 0) return ret; no_resume: + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 0; + synchronize_irq(phydev->irq); + + /* Rerun interrupts which were postponed by phy_interrupt() + * because they occurred during the system sleep transition. + */ + if (phydev->irq_rerun) { + phydev->irq_rerun = 0; + enable_irq(phydev->irq); + irq_wake_thread(phydev->irq, phydev); + } + } + if (phydev->attached_dev && phydev->adjust_link) phy_start_machine(phydev); diff --git a/include/linux/phy.h b/include/linux/phy.h index 508f1149665b..b09f7d36cff2 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -572,6 +572,10 @@ struct macsec_ops; * @mdix_ctrl: User setting of crossover * @pma_extable: Cached value of PMA/PMD Extended Abilities Register * @interrupts: Flag interrupts have been enabled + * @irq_suspended: Flag indicating PHY is suspended and therefore interrupt + * handling shall be postponed until PHY has resumed + * @irq_rerun: Flag indicating interrupts occurred while PHY was suspended, + * requiring a rerun of the interrupt handler after resume * @interface: enum phy_interface_t value * @skb: Netlink message for cable diagnostics * @nest: Netlink nest used for cable diagnostics @@ -626,6 +630,8 @@ struct phy_device { /* Interrupts are enabled */ unsigned interrupts:1; + unsigned irq_suspended:1; + unsigned irq_rerun:1; enum phy_state state;

2 years, 6 months

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FAILED: patch "[PATCH] net: phy: Don't trigger state machine while in suspend" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 1758bde2e4aa5ff188d53e7d9d388bbb7e12eebb Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas(a)wunner.de> Date: Tue, 28 Jun 2022 12:15:08 +0200 Subject: [PATCH] net: phy: Don't trigger state machine while in suspend Upon system sleep, mdio_bus_phy_suspend() stops the phy_state_machine(), but subsequent interrupts may retrigger it: They may have been left enabled to facilitate wakeup and are not quiesced until the ->suspend_noirq() phase. Unwanted interrupts may hence occur between mdio_bus_phy_suspend() and dpm_suspend_noirq(), as well as between dpm_resume_noirq() and mdio_bus_phy_resume(). Retriggering the phy_state_machine() through an interrupt is not only undesirable for the reason given in mdio_bus_phy_suspend() (freezing it midway with phydev->lock held), but also because the PHY may be inaccessible after it's suspended: Accesses to USB-attached PHYs are blocked once usb_suspend_both() clears the can_submit flag and PHYs on PCI network cards may become inaccessible upon suspend as well. Amend phy_interrupt() to avoid triggering the state machine if the PHY is suspended. Signal wakeup instead if the attached net_device or its parent has been configured as a wakeup source. (Those conditions are identical to mdio_bus_phy_may_suspend().) Postpone handling of the interrupt until the PHY has resumed. Before stopping the phy_state_machine() in mdio_bus_phy_suspend(), wait for a concurrent phy_interrupt() to run to completion. That is necessary because phy_interrupt() may have checked the PHY's suspend status before the system sleep transition commenced and it may thus retrigger the state machine after it was stopped. Likewise, after re-enabling interrupt handling in mdio_bus_phy_resume(), wait for a concurrent phy_interrupt() to complete to ensure that interrupts which it postponed are properly rerun. The issue was exposed by commit 1ce8b37241ed ("usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling"), but has existed since forever. Fixes: 541cd3ee00a4 ("phylib: Fix deadlock on resume") Link: https://lore.kernel.org/netdev/a5315a8a-32c2-962f-f696-de9a26d30091@samsung… Reported-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Tested-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Signed-off-by: Lukas Wunner <lukas(a)wunner.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Cc: stable(a)vger.kernel.org # v2.6.33+ Reviewed-by: Andrew Lunn <andrew(a)lunn.ch> Link: https://lore.kernel.org/r/b7f386d04e9b5b0e2738f0125743e30676f309ef.16564108… Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index ef62f357b76d..8d3ee3a6495b 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -31,6 +31,7 @@ #include <linux/io.h> #include <linux/uaccess.h> #include <linux/atomic.h> +#include <linux/suspend.h> #include <net/netlink.h> #include <net/genetlink.h> #include <net/sock.h> @@ -976,6 +977,28 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat) struct phy_driver *drv = phydev->drv; irqreturn_t ret; + /* Wakeup interrupts may occur during a system sleep transition. + * Postpone handling until the PHY has resumed. + */ + if (IS_ENABLED(CONFIG_PM_SLEEP) && phydev->irq_suspended) { + struct net_device *netdev = phydev->attached_dev; + + if (netdev) { + struct device *parent = netdev->dev.parent; + + if (netdev->wol_enabled) + pm_system_wakeup(); + else if (device_may_wakeup(&netdev->dev)) + pm_wakeup_dev_event(&netdev->dev, 0, true); + else if (parent && device_may_wakeup(parent)) + pm_wakeup_dev_event(parent, 0, true); + } + + phydev->irq_rerun = 1; + disable_irq_nosync(irq); + return IRQ_HANDLED; + } + mutex_lock(&phydev->lock); ret = drv->handle_interrupt(phydev); mutex_unlock(&phydev->lock); diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 431a8719c635..46acddd865a7 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -278,6 +278,15 @@ static __maybe_unused int mdio_bus_phy_suspend(struct device *dev) if (phydev->mac_managed_pm) return 0; + /* Wakeup interrupts may occur during the system sleep transition when + * the PHY is inaccessible. Set flag to postpone handling until the PHY + * has resumed. Wait for concurrent interrupt handler to complete. + */ + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 1; + synchronize_irq(phydev->irq); + } + /* We must stop the state machine manually, otherwise it stops out of * control, possibly with the phydev->lock held. Upon resume, netdev * may call phy routines that try to grab the same lock, and that may @@ -315,6 +324,20 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev) if (ret < 0) return ret; no_resume: + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 0; + synchronize_irq(phydev->irq); + + /* Rerun interrupts which were postponed by phy_interrupt() + * because they occurred during the system sleep transition. + */ + if (phydev->irq_rerun) { + phydev->irq_rerun = 0; + enable_irq(phydev->irq); + irq_wake_thread(phydev->irq, phydev); + } + } + if (phydev->attached_dev && phydev->adjust_link) phy_start_machine(phydev); diff --git a/include/linux/phy.h b/include/linux/phy.h index 508f1149665b..b09f7d36cff2 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -572,6 +572,10 @@ struct macsec_ops; * @mdix_ctrl: User setting of crossover * @pma_extable: Cached value of PMA/PMD Extended Abilities Register * @interrupts: Flag interrupts have been enabled + * @irq_suspended: Flag indicating PHY is suspended and therefore interrupt + * handling shall be postponed until PHY has resumed + * @irq_rerun: Flag indicating interrupts occurred while PHY was suspended, + * requiring a rerun of the interrupt handler after resume * @interface: enum phy_interface_t value * @skb: Netlink message for cable diagnostics * @nest: Netlink nest used for cable diagnostics @@ -626,6 +630,8 @@ struct phy_device { /* Interrupts are enabled */ unsigned interrupts:1; + unsigned irq_suspended:1; + unsigned irq_rerun:1; enum phy_state state;

2 years, 6 months

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FAILED: patch "[PATCH] net: phy: Don't trigger state machine while in suspend" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 1758bde2e4aa5ff188d53e7d9d388bbb7e12eebb Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas(a)wunner.de> Date: Tue, 28 Jun 2022 12:15:08 +0200 Subject: [PATCH] net: phy: Don't trigger state machine while in suspend Upon system sleep, mdio_bus_phy_suspend() stops the phy_state_machine(), but subsequent interrupts may retrigger it: They may have been left enabled to facilitate wakeup and are not quiesced until the ->suspend_noirq() phase. Unwanted interrupts may hence occur between mdio_bus_phy_suspend() and dpm_suspend_noirq(), as well as between dpm_resume_noirq() and mdio_bus_phy_resume(). Retriggering the phy_state_machine() through an interrupt is not only undesirable for the reason given in mdio_bus_phy_suspend() (freezing it midway with phydev->lock held), but also because the PHY may be inaccessible after it's suspended: Accesses to USB-attached PHYs are blocked once usb_suspend_both() clears the can_submit flag and PHYs on PCI network cards may become inaccessible upon suspend as well. Amend phy_interrupt() to avoid triggering the state machine if the PHY is suspended. Signal wakeup instead if the attached net_device or its parent has been configured as a wakeup source. (Those conditions are identical to mdio_bus_phy_may_suspend().) Postpone handling of the interrupt until the PHY has resumed. Before stopping the phy_state_machine() in mdio_bus_phy_suspend(), wait for a concurrent phy_interrupt() to run to completion. That is necessary because phy_interrupt() may have checked the PHY's suspend status before the system sleep transition commenced and it may thus retrigger the state machine after it was stopped. Likewise, after re-enabling interrupt handling in mdio_bus_phy_resume(), wait for a concurrent phy_interrupt() to complete to ensure that interrupts which it postponed are properly rerun. The issue was exposed by commit 1ce8b37241ed ("usbnet: smsc95xx: Forward PHY interrupts to PHY driver to avoid polling"), but has existed since forever. Fixes: 541cd3ee00a4 ("phylib: Fix deadlock on resume") Link: https://lore.kernel.org/netdev/a5315a8a-32c2-962f-f696-de9a26d30091@samsung… Reported-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Tested-by: Marek Szyprowski <m.szyprowski(a)samsung.com> Signed-off-by: Lukas Wunner <lukas(a)wunner.de> Acked-by: Rafael J. Wysocki <rafael.j.wysocki(a)intel.com> Cc: stable(a)vger.kernel.org # v2.6.33+ Reviewed-by: Andrew Lunn <andrew(a)lunn.ch> Link: https://lore.kernel.org/r/b7f386d04e9b5b0e2738f0125743e30676f309ef.16564108… Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index ef62f357b76d..8d3ee3a6495b 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -31,6 +31,7 @@ #include <linux/io.h> #include <linux/uaccess.h> #include <linux/atomic.h> +#include <linux/suspend.h> #include <net/netlink.h> #include <net/genetlink.h> #include <net/sock.h> @@ -976,6 +977,28 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat) struct phy_driver *drv = phydev->drv; irqreturn_t ret; + /* Wakeup interrupts may occur during a system sleep transition. + * Postpone handling until the PHY has resumed. + */ + if (IS_ENABLED(CONFIG_PM_SLEEP) && phydev->irq_suspended) { + struct net_device *netdev = phydev->attached_dev; + + if (netdev) { + struct device *parent = netdev->dev.parent; + + if (netdev->wol_enabled) + pm_system_wakeup(); + else if (device_may_wakeup(&netdev->dev)) + pm_wakeup_dev_event(&netdev->dev, 0, true); + else if (parent && device_may_wakeup(parent)) + pm_wakeup_dev_event(parent, 0, true); + } + + phydev->irq_rerun = 1; + disable_irq_nosync(irq); + return IRQ_HANDLED; + } + mutex_lock(&phydev->lock); ret = drv->handle_interrupt(phydev); mutex_unlock(&phydev->lock); diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c index 431a8719c635..46acddd865a7 100644 --- a/drivers/net/phy/phy_device.c +++ b/drivers/net/phy/phy_device.c @@ -278,6 +278,15 @@ static __maybe_unused int mdio_bus_phy_suspend(struct device *dev) if (phydev->mac_managed_pm) return 0; + /* Wakeup interrupts may occur during the system sleep transition when + * the PHY is inaccessible. Set flag to postpone handling until the PHY + * has resumed. Wait for concurrent interrupt handler to complete. + */ + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 1; + synchronize_irq(phydev->irq); + } + /* We must stop the state machine manually, otherwise it stops out of * control, possibly with the phydev->lock held. Upon resume, netdev * may call phy routines that try to grab the same lock, and that may @@ -315,6 +324,20 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev) if (ret < 0) return ret; no_resume: + if (phy_interrupt_is_valid(phydev)) { + phydev->irq_suspended = 0; + synchronize_irq(phydev->irq); + + /* Rerun interrupts which were postponed by phy_interrupt() + * because they occurred during the system sleep transition. + */ + if (phydev->irq_rerun) { + phydev->irq_rerun = 0; + enable_irq(phydev->irq); + irq_wake_thread(phydev->irq, phydev); + } + } + if (phydev->attached_dev && phydev->adjust_link) phy_start_machine(phydev); diff --git a/include/linux/phy.h b/include/linux/phy.h index 508f1149665b..b09f7d36cff2 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -572,6 +572,10 @@ struct macsec_ops; * @mdix_ctrl: User setting of crossover * @pma_extable: Cached value of PMA/PMD Extended Abilities Register * @interrupts: Flag interrupts have been enabled + * @irq_suspended: Flag indicating PHY is suspended and therefore interrupt + * handling shall be postponed until PHY has resumed + * @irq_rerun: Flag indicating interrupts occurred while PHY was suspended, + * requiring a rerun of the interrupt handler after resume * @interface: enum phy_interface_t value * @skb: Netlink message for cable diagnostics * @nest: Netlink nest used for cable diagnostics @@ -626,6 +630,8 @@ struct phy_device { /* Interrupts are enabled */ unsigned interrupts:1; + unsigned irq_suspended:1; + unsigned irq_rerun:1; enum phy_state state;

2 years, 6 months

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