This patch fix the following warnings from sparse,
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_module.c:222:25: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_module.c:222:25: expected restricted __le16 [usertype] data_cport drivers/staging/greybus/audio_module.c:222:25: got unsigned short [usertype] intf_cport_id drivers/staging/greybus/audio_topology.c:460:40: warning: restricted __le32 degrades to integer drivers/staging/greybus/audio_topology.c:691:41: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:691:41: expected unsigned int access drivers/staging/greybus/audio_topology.c:691:41: got restricted __le32 [usertype] access drivers/staging/greybus/audio_topology.c:746:44: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:746:44: expected unsigned int drivers/staging/greybus/audio_topology.c:746:44: got restricted __le32 drivers/staging/greybus/audio_topology.c:748:52: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:748:52: expected unsigned int drivers/staging/greybus/audio_topology.c:748:52: got restricted __le32 drivers/staging/greybus/audio_topology.c:802:42: warning: restricted __le32 degrades to integer drivers/staging/greybus/audio_topology.c:805:50: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:805:50: expected restricted __le32 drivers/staging/greybus/audio_topology.c:805:50: got unsigned int drivers/staging/greybus/audio_topology.c:814:50: warning: restricted __le32 degrades to integer drivers/staging/greybus/audio_topology.c:817:58: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:817:58: expected restricted __le32 drivers/staging/greybus/audio_topology.c:817:58: got unsigned int drivers/staging/greybus/audio_topology.c:889:25: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_topology.c:889:25: expected unsigned int access drivers/staging/greybus/audio_topology.c:889:25: got restricted __le32 [usertype] access
Suggested-by: Dan Carpenter dan.carpenter@oracle.com Reviewed-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Coiby Xu coiby.xu@gmail.com --- drivers/staging/greybus/audio_module.c | 6 +++--- drivers/staging/greybus/audio_topology.c | 18 +++++++++--------- 2 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/greybus/audio_module.c b/drivers/staging/greybus/audio_module.c index 16f60256adb2..c52c4f361b90 100644 --- a/drivers/staging/greybus/audio_module.c +++ b/drivers/staging/greybus/audio_module.c @@ -219,7 +219,7 @@ static int gb_audio_add_data_connection(struct gbaudio_module_info *gbmodule,
greybus_set_drvdata(bundle, gbmodule); dai->id = 0; - dai->data_cport = connection->intf_cport_id; + dai->data_cport = cpu_to_le16(connection->intf_cport_id); dai->connection = connection; list_add(&dai->list, &gbmodule->data_list);
@@ -329,7 +329,7 @@ static int gb_audio_probe(struct gb_bundle *bundle, if (ret) { dev_err(dev, "%d:Error while enabling %d:data connection\n", - ret, dai->data_cport); + ret, le16_to_cpu(dai->data_cport)); goto disable_data_connection; } } @@ -451,7 +451,7 @@ static int gb_audio_resume(struct device *dev) if (ret) { dev_err(dev, "%d:Error while enabling %d:data connection\n", - ret, dai->data_cport); + ret, le16_to_cpu(dai->data_cport)); return ret; } } diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 83b38ae8908c..56bf1a4f95ad 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -466,7 +466,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol, goto exit;
/* update ucontrol */ - if (gbvalue.value.integer_value[0] != val) { + if (gbvalue.value.integer_value[0] != cpu_to_le32(val)) { for (wi = 0; wi < wlist->num_widgets; wi++) { widget = wlist->widgets[wi]; snd_soc_dapm_mixer_update_power(widget->dapm, kcontrol, @@ -689,7 +689,7 @@ static int gbaudio_tplg_create_kcontrol(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport); - ctldata->access = ctl->access; + ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new) @@ -744,10 +744,10 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol, return ret; }
- ucontrol->value.enumerated.item[0] = gbvalue.value.enumerated_item[0]; + ucontrol->value.enumerated.item[0] = le32_to_cpu(gbvalue.value.enumerated_item[0]); if (e->shift_l != e->shift_r) ucontrol->value.enumerated.item[1] = - gbvalue.value.enumerated_item[1]; + le32_to_cpu(gbvalue.value.enumerated_item[1]);
return 0; } @@ -801,10 +801,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, mask = e->mask << e->shift_l;
if (gbvalue.value.enumerated_item[0] != - ucontrol->value.enumerated.item[0]) { + cpu_to_le32(ucontrol->value.enumerated.item[0])) { change = 1; gbvalue.value.enumerated_item[0] = - ucontrol->value.enumerated.item[0]; + cpu_to_le32(ucontrol->value.enumerated.item[0]); }
if (e->shift_l != e->shift_r) { @@ -813,10 +813,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, val |= ucontrol->value.enumerated.item[1] << e->shift_r; mask |= e->mask << e->shift_r; if (gbvalue.value.enumerated_item[1] != - ucontrol->value.enumerated.item[1]) { + cpu_to_le32(ucontrol->value.enumerated.item[1])) { change = 1; gbvalue.value.enumerated_item[1] = - ucontrol->value.enumerated.item[1]; + cpu_to_le32(ucontrol->value.enumerated.item[1]); } }
@@ -887,7 +887,7 @@ static int gbaudio_tplg_create_mixer_ctl(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport); - ctldata->access = ctl->access; + ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new)
snd_soc_pcm_stream.formats should use the bitmask SNDRV_PCM_FMTBIT_* instead of the sequential integers SNDRV_PCM_FORMAT_* as explained by commit e712bfca1ac1f63f622f87c2f33b57608f2a4d19 ("ASoC: codecs: use SNDRV_PCM_FMTBIT_* for format bitmask").
Found by sparse,
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_codec.c:691:36: warning: incorrect type in initializer (different base types) drivers/staging/greybus/audio_codec.c:691:36: expected unsigned long long [usertype] formats drivers/staging/greybus/audio_codec.c:691:36: got restricted snd_pcm_format_t [usertype] drivers/staging/greybus/audio_codec.c:701:36: warning: incorrect type in initializer (different base types) drivers/staging/greybus/audio_codec.c:701:36: expected unsigned long long [usertype] formats drivers/staging/greybus/audio_codec.c:701:36: got restricted snd_pcm_format_t [usertype]
Signed-off-by: Coiby Xu coiby.xu@gmail.com --- drivers/staging/greybus/audio_codec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c index 74538f8c5fa4..494aa823e998 100644 --- a/drivers/staging/greybus/audio_codec.c +++ b/drivers/staging/greybus/audio_codec.c @@ -688,7 +688,7 @@ static struct snd_soc_dai_driver gbaudio_dai[] = { .playback = { .stream_name = "I2S 0 Playback", .rates = SNDRV_PCM_RATE_48000, - .formats = SNDRV_PCM_FORMAT_S16_LE, + .formats = SNDRV_PCM_FMTBIT_S16_LE, .rate_max = 48000, .rate_min = 48000, .channels_min = 1, @@ -698,7 +698,7 @@ static struct snd_soc_dai_driver gbaudio_dai[] = { .capture = { .stream_name = "I2S 0 Capture", .rates = SNDRV_PCM_RATE_48000, - .formats = SNDRV_PCM_FORMAT_S16_LE, + .formats = SNDRV_PCM_FMTBIT_S16_LE, .rate_max = 48000, .rate_min = 48000, .channels_min = 1,
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t drivers/staging/greybus/audio_topology.c:679:14: warning: restricted snd_ctl_elem_iface_t degrades to integer drivers/staging/greybus/audio_topology.c:906:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
Signed-off-by: Coiby Xu coiby.xu@gmail.com --- drivers/staging/greybus/audio_topology.c | 2 +- include/uapi/sound/asound.h | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 56bf1a4f95ad..f6023ff390c2 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol, /* update uinfo */ uinfo->access = data->access; uinfo->count = data->vcount; - uinfo->type = (snd_ctl_elem_type_t)info->type; + uinfo->type = info->type;
switch (info->type) { case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN: diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64
-typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
From: Coiby Xu
Sent: 24 September 2020 11:21 Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
...
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
WTF is all that about anyway?? What is wrong with: #define SNDRV_CTL_ELEM_TYPE_NONE 0u /* invalid */
David
- Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
On Thu, Sep 24, 2020 at 06:20:39PM +0800, Coiby Xu wrote:
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t drivers/staging/greybus/audio_topology.c:679:14: warning: restricted snd_ctl_elem_iface_t degrades to integer drivers/staging/greybus/audio_topology.c:906:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
Signed-off-by: Coiby Xu coiby.xu@gmail.com
drivers/staging/greybus/audio_topology.c | 2 +- include/uapi/sound/asound.h | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 56bf1a4f95ad..f6023ff390c2 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol, /* update uinfo */ uinfo->access = data->access; uinfo->count = data->vcount;
- uinfo->type = (snd_ctl_elem_type_t)info->type;
- uinfo->type = info->type;
switch (info->type) { case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN: diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ }; -typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64 -typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
I can't take a uapi sound header file patch along with a driver change, these need to be independant.
And this is a userspace api, you just changed the size of an externally facing variable, are you _SURE_ that is ok to do?
thanks,
greg k-h
On 9/24/20 5:20 AM, Coiby Xu wrote:
This patch fix the following warnings from sparse,
You need to address Greg's comment.
But in general this looks good. I have one comment below, which you can address in v2. If you (or others) disagree with it, I'm fine with your code as-is. Either way, you can add this:
Reviewed-by: Alex Elder elder@linaro.org
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_module.c:222:25: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_module.c:222:25: expected restricted __le16 [usertype] data_cport drivers/staging/greybus/audio_module.c:222:25: got unsigned short [usertype] intf_cport_id drivers/staging/greybus/audio_topology.c:460:40: warning: restricted __le32 degrades to integer drivers/staging/greybus/audio_topology.c:691:41: warning: incorrect type in assignment (different base types)
. . .
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 83b38ae8908c..56bf1a4f95ad 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -466,7 +466,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol, goto exit; /* update ucontrol */
- if (gbvalue.value.integer_value[0] != val) {
- if (gbvalue.value.integer_value[0] != cpu_to_le32(val)) {
It's equivalent, but I have a small preference to convert the value from gbvalue into CPU byte order rather than what you have here.
for (wi = 0; wi < wlist->num_widgets; wi++) { widget = wlist->widgets[wi]; snd_soc_dapm_mixer_update_power(widget->dapm, kcontrol,@@ -689,7 +689,7 @@ static int gbaudio_tplg_create_kcontrol(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport);
ctldata->access = ctl->access;
ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new)@@ -744,10 +744,10 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol, return ret; }
- ucontrol->value.enumerated.item[0] = gbvalue.value.enumerated_item[0];
- ucontrol->value.enumerated.item[0] = le32_to_cpu(gbvalue.value.enumerated_item[0]); if (e->shift_l != e->shift_r) ucontrol->value.enumerated.item[1] =
gbvalue.value.enumerated_item[1];
le32_to_cpu(gbvalue.value.enumerated_item[1]);return 0; } @@ -801,10 +801,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, mask = e->mask << e->shift_l; if (gbvalue.value.enumerated_item[0] !=
ucontrol->value.enumerated.item[0]) {
cpu_to_le32(ucontrol->value.enumerated.item[0])) {
ucontrol->value.enumerated.item[0];
cpu_to_le32(ucontrol->value.enumerated.item[0]);if (e->shift_l != e->shift_r) { @@ -813,10 +813,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, val |= ucontrol->value.enumerated.item[1] << e->shift_r; mask |= e->mask << e->shift_r; if (gbvalue.value.enumerated_item[1] !=
ucontrol->value.enumerated.item[1]) {
cpu_to_le32(ucontrol->value.enumerated.item[1])) { change = 1; gbvalue.value.enumerated_item[1] =
ucontrol->value.enumerated.item[1];
cpu_to_le32(ucontrol->value.enumerated.item[1]);@@ -887,7 +887,7 @@ static int gbaudio_tplg_create_mixer_ctl(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport);
- ctldata->access = ctl->access;
- ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new)
On 9/24/20 5:20 AM, Coiby Xu wrote:
snd_soc_pcm_stream.formats should use the bitmask SNDRV_PCM_FMTBIT_* instead of the sequential integers SNDRV_PCM_FORMAT_* as explained by commit e712bfca1ac1f63f622f87c2f33b57608f2a4d19 ("ASoC: codecs: use SNDRV_PCM_FMTBIT_* for format bitmask").
Found by sparse,
Looks good.
Reviewed-by: Alex Elder elder@linaro.org
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_codec.c:691:36: warning: incorrect type in initializer (different base types) drivers/staging/greybus/audio_codec.c:691:36: expected unsigned long long [usertype] formats drivers/staging/greybus/audio_codec.c:691:36: got restricted snd_pcm_format_t [usertype] drivers/staging/greybus/audio_codec.c:701:36: warning: incorrect type in initializer (different base types) drivers/staging/greybus/audio_codec.c:701:36: expected unsigned long long [usertype] formats drivers/staging/greybus/audio_codec.c:701:36: got restricted snd_pcm_format_t [usertype]
Signed-off-by: Coiby Xu coiby.xu@gmail.com
drivers/staging/greybus/audio_codec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c index 74538f8c5fa4..494aa823e998 100644 --- a/drivers/staging/greybus/audio_codec.c +++ b/drivers/staging/greybus/audio_codec.c @@ -688,7 +688,7 @@ static struct snd_soc_dai_driver gbaudio_dai[] = { .playback = { .stream_name = "I2S 0 Playback", .rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FORMAT_S16_LE,
.formats = SNDRV_PCM_FMTBIT_S16_LE, .rate_max = 48000, .rate_min = 48000, .channels_min = 1,@@ -698,7 +698,7 @@ static struct snd_soc_dai_driver gbaudio_dai[] = { .capture = { .stream_name = "I2S 0 Capture", .rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FORMAT_S16_LE,
.formats = SNDRV_PCM_FMTBIT_S16_LE, .rate_max = 48000, .rate_min = 48000, .channels_min = 1,
On 9/24/20 5:20 AM, Coiby Xu wrote:
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
Greg's right, don't change the public header.
You could try this in the Greybus code to eliminate the warning, but I haven't tried it (and for all I know it's not a good idea):
uinfo->type = (__force snd_ctl_elem_type_t)info->type;
-Alex
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t drivers/staging/greybus/audio_topology.c:679:14: warning: restricted snd_ctl_elem_iface_t degrades to integer drivers/staging/greybus/audio_topology.c:906:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
Signed-off-by: Coiby Xu coiby.xu@gmail.com
drivers/staging/greybus/audio_topology.c | 2 +- include/uapi/sound/asound.h | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 56bf1a4f95ad..f6023ff390c2 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol, /* update uinfo */ uinfo->access = data->access; uinfo->count = data->vcount;
- uinfo->type = (snd_ctl_elem_type_t)info->type;
- uinfo->type = info->type;
switch (info->type) { case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN: diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ }; -typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64 -typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
On Thu, Sep 24, 2020 at 01:00:57PM +0200, Greg Kroah-Hartman wrote:
On Thu, Sep 24, 2020 at 06:20:39PM +0800, Coiby Xu wrote:
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_topology.c:185:24: warning: cast to restricted snd_ctl_elem_type_t drivers/staging/greybus/audio_topology.c:679:14: warning: restricted snd_ctl_elem_iface_t degrades to integer drivers/staging/greybus/audio_topology.c:906:14: warning: restricted snd_ctl_elem_iface_t degrades to integer
Signed-off-by: Coiby Xu coiby.xu@gmail.com
drivers/staging/greybus/audio_topology.c | 2 +- include/uapi/sound/asound.h | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 56bf1a4f95ad..f6023ff390c2 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -182,7 +182,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol, /* update uinfo */ uinfo->access = data->access; uinfo->count = data->vcount;
- uinfo->type = (snd_ctl_elem_type_t)info->type;
uinfo->type = info->type;
switch (info->type) { case GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN:
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64
-typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
I can't take a uapi sound header file patch along with a driver change, these need to be independant.
Thank you and Alex for reminding me this is a change of public header!
And this is a userspace api, you just changed the size of an externally facing variable, are you _SURE_ that is ok to do?
The reasons I make this change are, 1) using int to represent 7 enumeration values seems to be overkill; 2) using one type could avoid worries about byte order.
I examine one userspace example (libalsa-intf/alsa_mixer.c [1]). This change won't cause compiling breakage. But I don't the experience to imagine any other bad consequence.
Another way to avoid userspace API change is to let "struct gb_audio_ctl_elem_info" use snd_ctl_elem_iface_t type which may be more elegant than using "__force" as suggested by Alex,
$ git diff diff --git a/include/linux/greybus/greybus_protocols.h b/include/linux/greybus/greybus_protocols.h index aeb8f9243545..7f6753ec7ef7 100644 --- a/include/linux/greybus/greybus_protocols.h +++ b/include/linux/greybus/greybus_protocols.h @@ -8,6 +8,7 @@ #define __GREYBUS_PROTOCOLS_H
#include <linux/types.h> +#include <sound/asound.h>
/* Fixed IDs for control/svc protocols */
@@ -1997,7 +1998,7 @@ struct gb_audio_enumerated { } __packed;
struct gb_audio_ctl_elem_info { /* See snd_ctl_elem_info in Linux source */ - __u8 type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ + snd_ctl_elem_type_t type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ __le16 dimen[4]; union { struct gb_audio_integer integer
My only concern is if greybus authors have any special reason to not include sound/asound.h in the first place and re-define things like SNDRV_CTL_ELEM_TYPE_*,
/* See SNDRV_CTL_ELEM_TYPE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN 0x01 #define GB_AUDIO_CTL_ELEM_TYPE_INTEGER 0x02
/* See SNDRV_CTL_ELEM_IFACE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_IFACE_CARD 0x00 ...
/* SNDRV_CTL_ELEM_ACCESS_* in Linux source */ #define GB_AUDIO_ACCESS_READ BIT(0) ...
[1] https://gitlab.com/Codeaurora/platform_hardware_qcom_audio/-/blob/aee6032826... alsa_mixer.c
thanks,
greg k-h
-- Best regards, Coiby
On Thu, Sep 24, 2020 at 07:50:57AM -0500, Alex Elder wrote:
On 9/24/20 5:20 AM, Coiby Xu wrote:
This patch fix the following warnings from sparse,
You need to address Greg's comment.
But in general this looks good. I have one comment below, which you can address in v2. If you (or others) disagree with it, I'm fine with your code as-is. Either way, you can add this:
Reviewed-by: Alex Elder elder@linaro.org
Thank you fore reviewing this patch!
$ make C=2 drivers/staging/greybus/ drivers/staging/greybus/audio_module.c:222:25: warning: incorrect type in assignment (different base types) drivers/staging/greybus/audio_module.c:222:25: expected restricted __le16 [usertype] data_cport drivers/staging/greybus/audio_module.c:222:25: got unsigned short [usertype] intf_cport_id drivers/staging/greybus/audio_topology.c:460:40: warning: restricted __le32 degrades to integer drivers/staging/greybus/audio_topology.c:691:41: warning: incorrect type in assignment (different base types)
. . .
diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c index 83b38ae8908c..56bf1a4f95ad 100644 --- a/drivers/staging/greybus/audio_topology.c +++ b/drivers/staging/greybus/audio_topology.c @@ -466,7 +466,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol, goto exit;
/* update ucontrol */
- if (gbvalue.value.integer_value[0] != val) {
- if (gbvalue.value.integer_value[0] != cpu_to_le32(val)) {
It's equivalent, but I have a small preference to convert the value from gbvalue into CPU byte order rather than what you have here.
Thank you for the suggestion! I'll use CPU byte order when submitting next version.
for (wi = 0; wi < wlist->num_widgets; wi++) { widget = wlist->widgets[wi]; snd_soc_dapm_mixer_update_power(widget->dapm, kcontrol,@@ -689,7 +689,7 @@ static int gbaudio_tplg_create_kcontrol(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport);
ctldata->access = ctl->access;
ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new)@@ -744,10 +744,10 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol, return ret; }
- ucontrol->value.enumerated.item[0] = gbvalue.value.enumerated_item[0];
- ucontrol->value.enumerated.item[0] = le32_to_cpu(gbvalue.value.enumerated_item[0]); if (e->shift_l != e->shift_r) ucontrol->value.enumerated.item[1] =
gbvalue.value.enumerated_item[1];
le32_to_cpu(gbvalue.value.enumerated_item[1]);return 0;
} @@ -801,10 +801,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, mask = e->mask << e->shift_l;
if (gbvalue.value.enumerated_item[0] !=
ucontrol->value.enumerated.item[0]) {
cpu_to_le32(ucontrol->value.enumerated.item[0])) {
ucontrol->value.enumerated.item[0];
cpu_to_le32(ucontrol->value.enumerated.item[0]);}
if (e->shift_l != e->shift_r) {
@@ -813,10 +813,10 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol, val |= ucontrol->value.enumerated.item[1] << e->shift_r; mask |= e->mask << e->shift_r; if (gbvalue.value.enumerated_item[1] !=
ucontrol->value.enumerated.item[1]) {
cpu_to_le32(ucontrol->value.enumerated.item[1])) { change = 1; gbvalue.value.enumerated_item[1] =
ucontrol->value.enumerated.item[1];
cpu_to_le32(ucontrol->value.enumerated.item[1]);@@ -887,7 +887,7 @@ static int gbaudio_tplg_create_mixer_ctl(struct gbaudio_module_info *gb, return -ENOMEM; ctldata->ctl_id = ctl->id; ctldata->data_cport = le16_to_cpu(ctl->data_cport);
- ctldata->access = ctl->access;
- ctldata->access = le32_to_cpu(ctl->access); ctldata->vcount = ctl->count_values; ctldata->info = &ctl->info; *kctl = (struct snd_kcontrol_new)
-- Best regards, Coiby
On Thu, Sep 24, 2020 at 10:54:50AM +0000, David Laight wrote:
From: Coiby Xu
Sent: 24 September 2020 11:21 Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
...
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
WTF is all that about anyway?? What is wrong with: #define SNDRV_CTL_ELEM_TYPE_NONE 0u /* invalid */
I'm sorry I don't quite understand you. Are you suggesting SNDRV_CTL_ELEM_TYPE_NONE isn't needed in the first place?
David
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
-- Best regards, Coiby
On 9/25/20 9:07 AM, Coiby Xu wrote:
On Thu, Sep 24, 2020 at 01:00:57PM +0200, Greg Kroah-Hartman wrote:
On Thu, Sep 24, 2020 at 06:20:39PM +0800, Coiby Xu wrote:
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
. . .
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64
-typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
I can't take a uapi sound header file patch along with a driver change, these need to be independant.
Thank you and Alex for reminding me this is a change of public header!
And this is a userspace api, you just changed the size of an externally facing variable, are you _SURE_ that is ok to do?
The reasons I make this change are, 1) using int to represent 7 enumeration values seems to be overkill; 2) using one type could avoid worries about byte order.
(1) might be a valid suggestion, but the file you suggest changing is part of the Linux user space API, which you basically can't change.
I'm fairly certain the user space API is defined to have CPU-local byte order (unless specified explicitly otherwise) so that is not a concern.
I examine one userspace example (libalsa-intf/alsa_mixer.c [1]). This change won't cause compiling breakage. But I don't the experience to imagine any other bad consequence.
As a rule, once the user space API has been established, it stays with us forever. You can add to it, but modifying (or removing) an existing interface is essentially forbidden.
Another way to avoid userspace API change is to let "struct gb_audio_ctl_elem_info" use snd_ctl_elem_iface_t type which may be more elegant than using "__force" as suggested by Alex,
The Greybus definitions were explicitly defined to be operating system independent. For that reason there are (admittedly cumbersome) definitions of certain types and values that essentially mimic those defined by Linux exactly That way Linux (or another system using Greybus) can change its internal values without changing the Greybus API definition. (This addresses the concern you mention below.)
What you are suggesting is not consistent with that principle.
-Alex
$ git diff diff --git a/include/linux/greybus/greybus_protocols.h b/include/linux/greybus/greybus_protocols.h index aeb8f9243545..7f6753ec7ef7 100644 --- a/include/linux/greybus/greybus_protocols.h +++ b/include/linux/greybus/greybus_protocols.h @@ -8,6 +8,7 @@ #define __GREYBUS_PROTOCOLS_H
#include <linux/types.h> +#include <sound/asound.h>
/* Fixed IDs for control/svc protocols */
@@ -1997,7 +1998,7 @@ struct gb_audio_enumerated { } __packed;
struct gb_audio_ctl_elem_info { /* See snd_ctl_elem_info in Linux source */ - __u8 type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ + snd_ctl_elem_type_t type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ __le16 dimen[4]; union { struct gb_audio_integer integer
My only concern is if greybus authors have any special reason to not include sound/asound.h in the first place and re-define things like SNDRV_CTL_ELEM_TYPE_*,
/* See SNDRV_CTL_ELEM_TYPE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN 0x01 #define GB_AUDIO_CTL_ELEM_TYPE_INTEGER 0x02
/* See SNDRV_CTL_ELEM_IFACE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_IFACE_CARD 0x00 ...
/* SNDRV_CTL_ELEM_ACCESS_* in Linux source */ #define GB_AUDIO_ACCESS_READ BIT(0) ...
[1] https://gitlab.com/Codeaurora/platform_hardware_qcom_audio/-/blob/aee6032826...
alsa_mixer.c
thanks,
greg k-h
-- Best regards, Coiby
On 9/25/20 9:11 AM, Coiby Xu wrote:
On Thu, Sep 24, 2020 at 10:54:50AM +0000, David Laight wrote:
From: Coiby Xu
Sent: 24 September 2020 11:21 Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
...
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
WTF is all that about anyway?? What is wrong with: #define SNDRV_CTL_ELEM_TYPE_NONE 0u /* invalid */
I'm sorry I don't quite understand you. Are you suggesting SNDRV_CTL_ELEM_TYPE_NONE isn't needed in the first place?
I think David is asking why it's defined the way it is, and I'd guess it's to have the compiler issue an error if you attempt to assign one of these values to a variable or field of the wrong type.
No, you should not attempt to change this.
-Alex
David
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
-- Best regards, Coiby _______________________________________________ greybus-dev mailing list greybus-dev@lists.linaro.org https://lists.linaro.org/mailman/listinfo/greybus-dev
On Fri, Sep 25, 2020 at 11:02:23AM -0500, Alex Elder wrote:
On 9/25/20 9:11 AM, Coiby Xu wrote:
On Thu, Sep 24, 2020 at 10:54:50AM +0000, David Laight wrote:
From: Coiby Xu
Sent: 24 September 2020 11:21 Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
...
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
WTF is all that about anyway?? What is wrong with: #define SNDRV_CTL_ELEM_TYPE_NONE 0u /* invalid */
I'm sorry I don't quite understand you. Are you suggesting SNDRV_CTL_ELEM_TYPE_NONE isn't needed in the first place?
I think David is asking why it's defined the way it is, and I'd guess it's to have the compiler issue an error if you attempt to assign one of these values to a variable or field of the wrong type.
No, you should not attempt to change this.
Thank you for the explanation!
-AlexDavid
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
-- Best regards, Coiby _______________________________________________ greybus-dev mailing list greybus-dev@lists.linaro.org https://lists.linaro.org/mailman/listinfo/greybus-dev
-- Best regards, Coiby
On Fri, Sep 25, 2020 at 10:57:27AM -0500, Alex Elder wrote:
On 9/25/20 9:07 AM, Coiby Xu wrote:
On Thu, Sep 24, 2020 at 01:00:57PM +0200, Greg Kroah-Hartman wrote:
On Thu, Sep 24, 2020 at 06:20:39PM +0800, Coiby Xu wrote:
Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
. . .
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */ @@ -960,7 +960,7 @@ typedef int __bitwise snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_INTEGER64 ((__force snd_ctl_elem_type_t) 6) /* 64-bit integer type */ #define SNDRV_CTL_ELEM_TYPE_LAST SNDRV_CTL_ELEM_TYPE_INTEGER64
-typedef int __bitwise snd_ctl_elem_iface_t; +typedef __u8 snd_ctl_elem_iface_t; #define SNDRV_CTL_ELEM_IFACE_CARD ((__force snd_ctl_elem_iface_t) 0) /* global control */ #define SNDRV_CTL_ELEM_IFACE_HWDEP ((__force snd_ctl_elem_iface_t) 1) /* hardware dependent device */ #define SNDRV_CTL_ELEM_IFACE_MIXER ((__force snd_ctl_elem_iface_t) 2) /* virtual mixer device */
I can't take a uapi sound header file patch along with a driver change, these need to be independant.
Thank you and Alex for reminding me this is a change of public header!
And this is a userspace api, you just changed the size of an externally facing variable, are you _SURE_ that is ok to do?
The reasons I make this change are, 1) using int to represent 7 enumeration values seems to be overkill; 2) using one type could avoid worries about byte order.
(1) might be a valid suggestion, but the file you suggest changing is part of the Linux user space API, which you basically can't change.
I'm fairly certain the user space API is defined to have CPU-local byte order (unless specified explicitly otherwise) so that is not a concern.
Thank you for sharing me about the byte order of user space API which prompts me to examine where "info->type" comes from,
uinfo->type = (snd_ctl_elem_type_t)info->type;
Eventually it comes from the parsed topology data which is obtained via gb_audio_gb_get_topology(gbmodule->mgmt_connection, &topology). But since (struct gb_audio_ctl_elem_info*)->type has __u8 type, there is no endianness concern. Then based on the principles of userspace API shouldn't be modified and greybus is operating system independent, your previous suggestion to use __force which means "I know what I'm doing" is actually a good idea,
uinfo->type = (__force snd_ctl_elem_type_t)info->type;
I examine one userspace example (libalsa-intf/alsa_mixer.c [1]). This change won't cause compiling breakage. But I don't the experience to imagine any other bad consequence.
As a rule, once the user space API has been established, it stays with us forever. You can add to it, but modifying (or removing) an existing interface is essentially forbidden.
Another way to avoid userspace API change is to let "struct gb_audio_ctl_elem_info" use snd_ctl_elem_iface_t type which may be more elegant than using "__force" as suggested by Alex,
The Greybus definitions were explicitly defined to be operating system independent. For that reason there are (admittedly cumbersome) definitions of certain types and values that essentially mimic those defined by Linux exactly That way Linux (or another system using Greybus) can change its internal values without changing the Greybus API definition. (This addresses the concern you mention below.)
What you are suggesting is not consistent with that principle.
-Alex$ git diff diff --git a/include/linux/greybus/greybus_protocols.h b/include/linux/greybus/greybus_protocols.h index aeb8f9243545..7f6753ec7ef7 100644 --- a/include/linux/greybus/greybus_protocols.h +++ b/include/linux/greybus/greybus_protocols.h @@ -8,6 +8,7 @@ #define __GREYBUS_PROTOCOLS_H
#include <linux/types.h> +#include <sound/asound.h>
/* Fixed IDs for control/svc protocols */
@@ -1997,7 +1998,7 @@ struct gb_audio_enumerated { } __packed;
struct gb_audio_ctl_elem_info { /* See snd_ctl_elem_info in Linux source */ - __u8 type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ + snd_ctl_elem_type_t type; /* GB_AUDIO_CTL_ELEM_TYPE_* */ __le16 dimen[4]; union { struct gb_audio_integer integer
My only concern is if greybus authors have any special reason to not include sound/asound.h in the first place and re-define things like SNDRV_CTL_ELEM_TYPE_*,
/* See SNDRV_CTL_ELEM_TYPE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_TYPE_BOOLEAN 0x01 #define GB_AUDIO_CTL_ELEM_TYPE_INTEGER 0x02
/* See SNDRV_CTL_ELEM_IFACE_* in Linux source */ #define GB_AUDIO_CTL_ELEM_IFACE_CARD 0x00 ...
/* SNDRV_CTL_ELEM_ACCESS_* in Linux source */ #define GB_AUDIO_ACCESS_READ BIT(0) ...
[1] https://gitlab.com/Codeaurora/platform_hardware_qcom_audio/-/blob/aee6032826...
alsa_mixer.c
thanks,
greg k-h
-- Best regards, Coiby
-- Best regards, Coiby
From: Coiby Xu
Sent: 25 September 2020 15:11
On Thu, Sep 24, 2020 at 10:54:50AM +0000, David Laight wrote:
From: Coiby Xu
Sent: 24 September 2020 11:21 Use __8 to replace int and remove the unnecessary __bitwise type attribute.
Found by sparse,
...
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 535a7229e1d9..8e71a95644ab 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -950,7 +950,7 @@ struct snd_ctl_card_info { unsigned char components[128]; /* card components / fine identification, delimited with one space (AC97 etc..) */ };
-typedef int __bitwise snd_ctl_elem_type_t; +typedef __u8 snd_ctl_elem_type_t; #define SNDRV_CTL_ELEM_TYPE_NONE ((__force snd_ctl_elem_type_t) 0) /* invalid */ #define SNDRV_CTL_ELEM_TYPE_BOOLEAN ((__force snd_ctl_elem_type_t) 1) /* boolean type */ #define SNDRV_CTL_ELEM_TYPE_INTEGER ((__force snd_ctl_elem_type_t) 2) /* integer type */
WTF is all that about anyway?? What is wrong with: #define SNDRV_CTL_ELEM_TYPE_NONE 0u /* invalid */
I'm sorry I don't quite understand you. Are you suggesting SNDRV_CTL_ELEM_TYPE_NONE isn't needed in the first place?
No, just remove all the casts from the constants. Are the types even used anywhere else?
David
- Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
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Alex Elder -
Coiby Xu -
David Laight -
Greg Kroah-Hartman