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[PATCH netdev] net: stmmac: dwmac-rk: Provide FIFO sizes for DWMAC 1000

by Chen-Yu Tsai

From: Chen-Yu Tsai <wens(a)csie.org> The DWMAC 1000 DMA capabilities register does not provide actual FIFO sizes, nor does the driver really care. If they are not provided via some other means, the driver will work fine, only disallowing changing the MTU setting. The recent commit 8865d22656b4 ("net: stmmac: Specify hardware capability value when FIFO size isn't specified") changed this by requiring the FIFO sizes to be provided, breaking devices that were working just fine. Provide the FIFO sizes through the driver's platform data, to not only fix the breakage, but also enable MTU changes. The FIFO sizes are confirmed to be the same across RK3288, RK3328, RK3399 and PX30, based on their respective manuals. It is likely that Rockchip synthesized their DWMAC 1000 with the same parameters on all their chips that have it. Fixes: eaf4fac47807 ("net: stmmac: Do not accept invalid MTU values") Fixes: 8865d22656b4 ("net: stmmac: Specify hardware capability value when FIFO size isn't specified") Cc: <stable(a)vger.kernel.org> Signed-off-by: Chen-Yu Tsai <wens(a)csie.org> --- The reason for stable inclusion is not to fix the device breakage (which only broke in v6.14-rc1), but to provide the values so that MTU changes can work in older kernels. Since a fix for stmmac in general has already been sent [1] and a revert was also proposed [2], I'll refrain from sending mine. [1] https://lore.kernel.org/all/20250203093419.25804-1-steven.price@arm.com/ [2] https://lore.kernel.org/all/Z6Clkh44QgdNJu_O@shell.armlinux.org.uk/ drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c index a4dc89e23a68..71a4c4967467 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c @@ -1966,8 +1966,11 @@ static int rk_gmac_probe(struct platform_device *pdev) /* If the stmmac is not already selected as gmac4, * then make sure we fallback to gmac. */ - if (!plat_dat->has_gmac4) + if (!plat_dat->has_gmac4) { plat_dat->has_gmac = true; + plat_dat->rx_fifo_size = 4096; + plat_dat->tx_fifo_size = 2048; + } plat_dat->fix_mac_speed = rk_fix_speed; plat_dat->bsp_priv = rk_gmac_setup(pdev, plat_dat, data); -- 2.39.5

9 months, 1 week

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[PATCH v2] Documentation/no_hz: Remove description that states boot CPU cannot be nohz_full

by Krishanth Jagaduri via B4 Relay

From: Oleg Nesterov <oleg(a)redhat.com> sched/isolation: Prevent boot crash when the boot CPU is nohz_full [ Upstream commit 5097cbcb38e6e0d2627c9dde1985e91d2c9f880e ] Documentation/timers/no_hz.rst states that the "nohz_full=" mask must not include the boot CPU, which is no longer true after: commit 08ae95f4fd3b ("nohz_full: Allow the boot CPU to be nohz_full"). However after: aae17ebb53cd ("workqueue: Avoid using isolated cpus' timers on queue_delayed_work") the kernel will crash at boot time in this case; housekeeping_any_cpu() returns an invalid CPU number until smp_init() brings the first housekeeping CPU up. Change housekeeping_any_cpu() to check the result of cpumask_any_and() and return smp_processor_id() in this case. This is just the simple and backportable workaround which fixes the symptom, but smp_processor_id() at boot time should be safe at least for type == HK_TYPE_TIMER, this more or less matches the tick_do_timer_boot_cpu logic. There is no worry about cpu_down(); tick_nohz_cpu_down() will not allow to offline tick_do_timer_cpu (the 1st online housekeeping CPU). [ Apply only documentation changes as commit which causes boot crash when boot CPU is nohz_full is not backported to stable kernels - Krishanth ] Fixes: aae17ebb53cd ("workqueue: Avoid using isolated cpus' timers on queue_delayed_work") Reported-by: Chris von Recklinghausen <crecklin(a)redhat.com> Signed-off-by: Oleg Nesterov <oleg(a)redhat.com> Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de> Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Reviewed-by: Phil Auld <pauld(a)redhat.com> Acked-by: Frederic Weisbecker <frederic(a)kernel.org> Link: https://lore.kernel.org/r/20240411143905.GA19288@redhat.com Closes: https://lore.kernel.org/all/20240402105847.GA24832@redhat.com/ Cc: stable(a)vger.kernel.org # 5.4+ Signed-off-by: Krishanth Jagaduri <Krishanth.Jagaduri(a)sony.com> --- Hi, Before kernel 6.9, Documentation/timers/no_hz.rst states that "nohz_full=" mask must not include the boot CPU, which is no longer true after commit 08ae95f4fd3b ("nohz_full: Allow the boot CPU to be nohz_full"). When trying LTS kernels between 5.4 and 6.6, we noticed we could use boot CPU as nohz_full but the information in the document was misleading. This was fixed upstream by commit 5097cbcb38e6 ("sched/isolation: Prevent boot crash when the boot CPU is nohz_full"). While it fixes the document description, it also fixes issue introduced by another commit aae17ebb53cd ("workqueue: Avoid using isolated cpus' timers on queue_delayed_work"). It is unlikely that upstream commit as a whole will be backported to stable kernels which does not contain the commit that introduced the issue of boot crash when boot CPU is nohz_full. Could we fix only the document portion in stable kernels 5.4+ that mentions boot CPU cannot be nohz_full? --- Changes in v2: - Add original changelog and trailers to commit message. - Add backport note for why only document portion is modified. - Link to v1: https://lore.kernel.org/r/20250205-send-oss-20250129-v1-1-d404921e6d7e@sony… --- Documentation/timers/no_hz.rst | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/Documentation/timers/no_hz.rst b/Documentation/timers/no_hz.rst index 065db217cb04fc252bbf6a05991296e7f1d3a4c5..16bda468423e88090c0dc467ca7a5c7f3fd2bf02 100644 --- a/Documentation/timers/no_hz.rst +++ b/Documentation/timers/no_hz.rst @@ -129,11 +129,8 @@ adaptive-tick CPUs: At least one non-adaptive-tick CPU must remain online to handle timekeeping tasks in order to ensure that system calls like gettimeofday() returns accurate values on adaptive-tick CPUs. (This is not an issue for CONFIG_NO_HZ_IDLE=y because there are no running -user processes to observe slight drifts in clock rate.) Therefore, the -boot CPU is prohibited from entering adaptive-ticks mode. Specifying a -"nohz_full=" mask that includes the boot CPU will result in a boot-time -error message, and the boot CPU will be removed from the mask. Note that -this means that your system must have at least two CPUs in order for +user processes to observe slight drifts in clock rate.) Note that this +means that your system must have at least two CPUs in order for CONFIG_NO_HZ_FULL=y to do anything for you. Finally, adaptive-ticks CPUs must have their RCU callbacks offloaded. --- base-commit: 219d54332a09e8d8741c1e1982f5eae56099de85 change-id: 20250129-send-oss-20250129-3c42dcf463eb Best regards, -- Krishanth Jagaduri <Krishanth.Jagaduri(a)sony.com>

9 months, 1 week

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[PATCH v2] ftrace: Avoid potential division by zero in function_stat_show()

by Nikolay Kuratov

Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier. Cc: stable(a)vger.kernel.org Fixes: e31f7939c1c27 ("ftrace: Avoid potential division by zero in function profiler") Signed-off-by: Nikolay Kuratov <kniv(a)yandex-team.ru> --- v2: Instead of splitting the division into two store denominator into separate variable and zero-check it kernel/trace/ftrace.c | 27 ++++++++++++--------------- 1 file changed, 12 insertions(+), 15 deletions(-) diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 728ecda6e8d4..9ea6609588cf 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -540,6 +540,7 @@ static int function_stat_show(struct seq_file *m, void *v) static struct trace_seq s; unsigned long long avg; unsigned long long stddev; + unsigned long long stddev_denom; #endif guard(mutex)(&ftrace_profile_lock); @@ -559,23 +560,19 @@ static int function_stat_show(struct seq_file *m, void *v) #ifdef CONFIG_FUNCTION_GRAPH_TRACER seq_puts(m, " "); - /* Sample standard deviation (s^2) */ - if (rec->counter <= 1) - stddev = 0; - else { - /* - * Apply Welford's method: - * s^2 = 1 / (n * (n-1)) * (n * \Sum (x_i)^2 - (\Sum x_i)^2) - */ + /* + * Variance formula: + * s^2 = 1 / (n * (n-1)) * (n * \Sum (x_i)^2 - (\Sum x_i)^2) + * Maybe Welford's method is better here? + * Divide only by 1000 for ns^2 -> us^2 conversion. + * trace_print_graph_duration will divide by 1000 again. + */ + stddev = 0; + stddev_denom = rec->counter * (rec->counter - 1) * 1000; + if (stddev_denom) { stddev = rec->counter * rec->time_squared - rec->time * rec->time; - - /* - * Divide only 1000 for ns^2 -> us^2 conversion. - * trace_print_graph_duration will divide 1000 again. - */ - stddev = div64_ul(stddev, - rec->counter * (rec->counter - 1) * 1000); + stddev = div64_ul(stddev, stddev_denom); } trace_seq_init(&s); -- 2.34.1

9 months, 1 week

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[PATCH] net: stmmac: dwmac-loongson: Set correct {tx,rx}_fifo_size

by Huacai Chen

Now for dwmac-loongson {tx,rx}_fifo_size are uninitialised, which means zero. This means dwmac-loongson doesn't support changing MTU, so set the correct tx_fifo_size and rx_fifo_size for it (16KB multiplied by channel counts). Note: the Fixes tag is not exactly right, but it is a key commit of the dwmac-loongson series. Cc: stable(a)vger.kernel.org Fixes: ad72f783de06827a1f ("net: stmmac: Add multi-channel support") Signed-off-by: Chong Qiao <qiaochong(a)loongson.cn> Signed-off-by: Huacai Chen <chenhuacai(a)loongson.cn> --- drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c index bfe6e2d631bd..79acdf38c525 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c @@ -574,6 +574,9 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id if (ret) goto err_disable_device; + plat->tx_fifo_size = SZ_16K * plat->tx_queues_to_use; + plat->rx_fifo_size = SZ_16K * plat->rx_queues_to_use; + if (dev_of_node(&pdev->dev)) ret = loongson_dwmac_dt_config(pdev, plat, &res); else -- 2.47.1

9 months, 1 week

5
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[PATCH 2/2] scsi: qedf: Add check for bdt_info

by Jiasheng Jiang

Add a check for "bdt_info". Otherwise, if one of the allocations for "cmgr->io_bdt_pool[i]" fails, "bdt_info->bd_tbl" will cause a NULL pointer dereference. Fixes: 61d8658b4a43 ("scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework.") Cc: <stable(a)vger.kernel.org> # v5.10+ Signed-off-by: Jiasheng Jiang <jiashengjiangcool(a)gmail.com> --- drivers/scsi/qedf/qedf_io.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c index d52057b97a4f..1ed0ee4f8dde 100644 --- a/drivers/scsi/qedf/qedf_io.c +++ b/drivers/scsi/qedf/qedf_io.c @@ -125,7 +125,7 @@ void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr) bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge); for (i = 0; i < num_ios; i++) { bdt_info = cmgr->io_bdt_pool[i]; - if (bdt_info->bd_tbl) { + if (bdt_info && bdt_info->bd_tbl) { dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz, bdt_info->bd_tbl, bdt_info->bd_tbl_dma); bdt_info->bd_tbl = NULL; -- 2.25.1

9 months, 1 week

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[PATCH net] selftests: mptcp: connect: -f: no reconnect

by Matthieu Baerts (NGI0)

The '-f' parameter is there to force the kernel to emit MPTCP FASTCLOSE by closing the connection with unread bytes in the receive queue. The xdisconnect() helper was used to stop the connection, but it does more than that: it will shut it down, then wait before reconnecting to the same address. This causes the mptcp_join's "fastclose test" to fail all the time. This failure is due to a recent change, with commit 218cc166321f ("selftests: mptcp: avoid spurious errors on disconnect"), but that went unnoticed because the test is currently ignored. The recent modification only shown an existing issue: xdisconnect() doesn't need to be used here, only the shutdown() part is needed. Fixes: 6bf41020b72b ("selftests: mptcp: update and extend fastclose test-cases") Cc: stable(a)vger.kernel.org Reviewed-by: Mat Martineau <martineau(a)kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe(a)kernel.org> --- Notes: - The failure was not clearly visible on NIPA, because the results for the two impacted sub-tests are currently ignored (unstable). Still, it looks important to fix that, as this will help when the tests will be improved not to be unstable any more. --- tools/testing/selftests/net/mptcp/mptcp_connect.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c index 414addef9a4514c489ecd09249143fe0ce2af649..d240d02fa443a1cd802f0e705ab36db5c22063a8 100644 --- a/tools/testing/selftests/net/mptcp/mptcp_connect.c +++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c @@ -1302,7 +1302,7 @@ int main_loop(void) return ret; if (cfg_truncate > 0) { - xdisconnect(fd); + shutdown(fd, SHUT_WR); } else if (--cfg_repeat > 0) { xdisconnect(fd); --- base-commit: 4241a702e0d0c2ca9364cfac08dbf134264962de change-id: 20250204-net-mptcp-sft-conn-f-d1c14274ba66 Best regards, -- Matthieu Baerts (NGI0) <matttbe(a)kernel.org>

9 months, 1 week

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[PATCH 6.6 0/6] md/md-bitmap: move bitmap_{start, end}write to md upper layer

by Yu Kuai

From: Yu Kuai <yukuai3(a)huawei.com> This set fix reported problem: https://lore.kernel.org/all/CAJpMwyjmHQLvm6zg1cmQErttNNQPDAAXPKM3xgTjMhbfts… https://lore.kernel.org/all/ADF7D720-5764-4AF3-B68E-1845988737AA@flyingcirc… See details in patch 6. Benjamin Marzinski (1): md/raid5: recheck if reshape has finished with device_lock held Yu Kuai (5): md/md-bitmap: factor behind write counters out from bitmap_{start/end}write() md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() md: add a new callback pers->bitmap_sector() md/raid5: implement pers->bitmap_sector() md/md-bitmap: move bitmap_{start, end}write to md upper layer drivers/md/md-bitmap.c | 75 ++++++++++------- drivers/md/md-bitmap.h | 6 +- drivers/md/md.c | 26 ++++++ drivers/md/md.h | 5 ++ drivers/md/raid1.c | 35 ++------ drivers/md/raid1.h | 1 - drivers/md/raid10.c | 26 +----- drivers/md/raid10.h | 1 - drivers/md/raid5-cache.c | 4 - drivers/md/raid5.c | 174 ++++++++++++++++++++++----------------- drivers/md/raid5.h | 4 - 11 files changed, 185 insertions(+), 172 deletions(-) -- 2.39.2

9 months, 1 week

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[PATCH 6.13 0/5] md/md-bitmap: move bitmap_{start, end}write to md upper layer

by Yu Kuai

This set fix reported problem: https://lore.kernel.org/all/CAJpMwyjmHQLvm6zg1cmQErttNNQPDAAXPKM3xgTjMhbfts… https://lore.kernel.org/all/ADF7D720-5764-4AF3-B68E-1845988737AA@flyingcirc… See details in patch 5. Yu Kuai (5): md/md-bitmap: factor behind write counters out from bitmap_{start/end}write() md/md-bitmap: remove the last parameter for bimtap_ops->endwrite() md: add a new callback pers->bitmap_sector() md/raid5: implement pers->bitmap_sector() md/md-bitmap: move bitmap_{start, end}write to md upper layer drivers/md/md-bitmap.c | 74 ++++++++++++++++---------- drivers/md/md-bitmap.h | 7 ++- drivers/md/md.c | 29 ++++++++++ drivers/md/md.h | 5 ++ drivers/md/raid1.c | 34 +++--------- drivers/md/raid1.h | 1 - drivers/md/raid10.c | 26 +-------- drivers/md/raid10.h | 1 - drivers/md/raid5-cache.c | 4 -- drivers/md/raid5.c | 111 ++++++++++++++++++++------------------- drivers/md/raid5.h | 4 -- 11 files changed, 149 insertions(+), 147 deletions(-) -- 2.39.2

9 months, 1 week

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[PATCH] drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl

by Haoyu Li

In the "pmcmd_ioctl" function, three memory objects allocated by kmalloc are initialized by "hcall_get_cpu_state", which are then copied to user space. The initializer is indeed implemented in "acrn_hypercall2" (arch/x86/include/asm/acrn.h). There is a risk of information leakage due to uninitialized bytes. Fixes: 3d679d5aec64 ("virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor") Signed-off-by: Haoyu Li <lihaoyu499(a)gmail.com> Cc: stable(a)vger.kernel.org --- drivers/virt/acrn/hsm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c index c24036c4e51e..e4e196abdaac 100644 --- a/drivers/virt/acrn/hsm.c +++ b/drivers/virt/acrn/hsm.c @@ -49,7 +49,7 @@ static int pmcmd_ioctl(u64 cmd, void __user *uptr) switch (cmd & PMCMD_TYPE_MASK) { case ACRN_PMCMD_GET_PX_CNT: case ACRN_PMCMD_GET_CX_CNT: - pm_info = kmalloc(sizeof(u64), GFP_KERNEL); + pm_info = kzalloc(sizeof(u64), GFP_KERNEL); if (!pm_info) return -ENOMEM; @@ -64,7 +64,7 @@ static int pmcmd_ioctl(u64 cmd, void __user *uptr) kfree(pm_info); break; case ACRN_PMCMD_GET_PX_DATA: - px_data = kmalloc(sizeof(*px_data), GFP_KERNEL); + px_data = kzalloc(sizeof(*px_data), GFP_KERNEL); if (!px_data) return -ENOMEM; @@ -79,7 +79,7 @@ static int pmcmd_ioctl(u64 cmd, void __user *uptr) kfree(px_data); break; case ACRN_PMCMD_GET_CX_DATA: - cx_data = kmalloc(sizeof(*cx_data), GFP_KERNEL); + cx_data = kzalloc(sizeof(*cx_data), GFP_KERNEL); if (!cx_data) return -ENOMEM; -- 2.34.1

9 months, 1 week

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[PATCH] usb: roles: cache usb roles received during switch registration

by Elson Roy Serrao

The role switch registration and set_role() can happen in parallel as they are invoked independent of each other. There is a possibility that a driver might spend significant amount of time in usb_role_switch_register() API due to the presence of time intensive operations like component_add() which operate under common mutex. This leads to a time window after allocating the switch and before setting the registered flag where the set role notifications are dropped. Below timeline summarizes this behavior Thread1 | Thread2 usb_role_switch_register() | | | ---> allocate switch | | | ---> component_add() | usb_role_switch_set_role() | | | | | --> Drop role notifications | | since sw->registered | | flag is not set. | | --->Set registered flag.| To avoid this, cache the last role received and set it once the switch registration is complete. Since we are now caching the roles based on registered flag, protect this flag with the switch mutex. Fixes: b787a3e78175 ("usb: roles: don't get/set_role() when usb_role_switch is unregistered") cc: stable(a)vger.kernel.org Signed-off-by: Elson Roy Serrao <quic_eserrao(a)quicinc.com> --- drivers/usb/roles/class.c | 45 ++++++++++++++++++++++++++++++++------- 1 file changed, 37 insertions(+), 8 deletions(-) diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index c58a12c147f4..c0149c31c01b 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -26,6 +26,8 @@ struct usb_role_switch { struct mutex lock; /* device lock*/ struct module *module; /* the module this device depends on */ enum usb_role role; + enum usb_role cached_role; + bool cached; bool registered; /* From descriptor */ @@ -65,6 +67,20 @@ static const struct component_ops connector_ops = { .unbind = connector_unbind, }; +static int __usb_role_switch_set_role(struct usb_role_switch *sw, + enum usb_role role) +{ + int ret; + + ret = sw->set(sw, role); + if (!ret) { + sw->role = role; + kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); + } + + return ret; +} + /** * usb_role_switch_set_role - Set USB role for a switch * @sw: USB role switch @@ -79,17 +95,21 @@ int usb_role_switch_set_role(struct usb_role_switch *sw, enum usb_role role) if (IS_ERR_OR_NULL(sw)) return 0; - if (!sw->registered) - return -EOPNOTSUPP; - + /* + * Since we have a valid sw struct here, role switch registration might + * be in progress. Hence cache the role here and send it out once + * registration is complete. + */ mutex_lock(&sw->lock); - - ret = sw->set(sw, role); - if (!ret) { - sw->role = role; - kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE); + if (!sw->registered) { + sw->cached = true; + sw->cached_role = role; + mutex_unlock(&sw->lock); + return 0; } + ret = __usb_role_switch_set_role(sw, role); + mutex_unlock(&sw->lock); return ret; @@ -399,8 +419,14 @@ usb_role_switch_register(struct device *parent, dev_warn(&sw->dev, "failed to add component\n"); } + mutex_lock(&sw->lock); sw->registered = true; + if (sw->cached) + __usb_role_switch_set_role(sw, sw->cached_role); + + mutex_unlock(&sw->lock); + /* TODO: Symlinks for the host port and the device controller. */ return sw; @@ -417,7 +443,10 @@ void usb_role_switch_unregister(struct usb_role_switch *sw) { if (IS_ERR_OR_NULL(sw)) return; + mutex_lock(&sw->lock); sw->registered = false; + sw->cached = false; + mutex_unlock(&sw->lock); if (dev_fwnode(&sw->dev)) component_del(&sw->dev, &connector_ops); device_unregister(&sw->dev); -- 2.17.1

9 months, 1 week

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