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ALSA: pcm: Apply power lock globally to common ioctls 

All PCM common ioctls should run only in the powered up state, but
currently only a few ioctls do the proper snd_power_lock() and
snd_power_wait() invocations.  Instead of adding to each place, do it
commonly in the caller side, so that all these ioctls are assured to
be operated at the power up state.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
hifive-unleashed-5.1
Takashi Iwai 2016-05-24 15:07:39 +02:00
parent 34bcc44abb
commit 68b4acd322
1 changed files with 19 additions and 37 deletions
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56
sound/core/pcm_native.c
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@ -1540,14 +1540,7 @@ static const struct action_ops snd_pcm_action_resume = {
static int snd_pcm_resume(struct snd_pcm_substream *substream)
{
struct snd_card *card = substream->pcm->card;
int res;
snd_power_lock(card);
if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
snd_power_unlock(card);
return res;
return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
}
#else
@ -1566,17 +1559,9 @@ static int snd_pcm_resume(struct snd_pcm_substream *substream)
*/
static int snd_pcm_xrun(struct snd_pcm_substream *substream)
{
struct snd_card *card = substream->pcm->card;
struct snd_pcm_runtime *runtime = substream->runtime;
int result;
snd_power_lock(card);
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (result < 0)
goto _unlock;
}
snd_pcm_stream_lock_irq(substream);
switch (runtime->status->state) {
case SNDRV_PCM_STATE_XRUN:
@ -1589,8 +1574,6 @@ static int snd_pcm_xrun(struct snd_pcm_substream *substream)
result = -EBADFD;
}
snd_pcm_stream_unlock_irq(substream);
_unlock:
snd_power_unlock(card);
return result;
}
@ -1694,8 +1677,6 @@ static const struct action_ops snd_pcm_action_prepare = {
static int snd_pcm_prepare(struct snd_pcm_substream *substream,
struct file *file)
{
int res;
struct snd_card *card = substream->pcm->card;
int f_flags;
if (file)
@ -1703,12 +1684,8 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream,
else
f_flags = substream->f_flags;
snd_power_lock(card);
if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
substream, f_flags);
snd_power_unlock(card);
return res;
return snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
substream, f_flags);
}
/*
@ -1805,15 +1782,6 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
return -EBADFD;
snd_power_lock(card);
if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (result < 0) {
snd_power_unlock(card);
return result;
}
}
if (file) {
if (file->f_flags & O_NONBLOCK)
nonblock = 1;
@ -1896,7 +1864,6 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
unlock:
snd_pcm_stream_unlock_irq(substream);
up_read(&snd_pcm_link_rwsem);
snd_power_unlock(card);
return result;
}
@ -2798,7 +2765,7 @@ static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
return 0;
}
static int snd_pcm_common_ioctl1(struct file *file,
static int snd_pcm_common_ioctl(struct file *file,
struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
@ -2873,6 +2840,21 @@ static int snd_pcm_common_ioctl1(struct file *file,
return -ENOTTY;
}
static int snd_pcm_common_ioctl1(struct file *file,
struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)
{
struct snd_card *card = substream->pcm->card;
int res;
snd_power_lock(card);
res = snd_power_wait(card, SNDRV_CTL_POWER_D0);
if (res >= 0)
res = snd_pcm_common_ioctl(file, substream, cmd, arg);
snd_power_unlock(card);
return res;
}
static int snd_pcm_playback_ioctl1(struct file *file,
struct snd_pcm_substream *substream,
unsigned int cmd, void __user *arg)