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ALSA: pcm: Update the state properly before notification 

Some state changes (e.g. snd_pcm_stop()) sets the runtime state after
calling snd_timer_notify().  This is basically racy, since the
notification may wakes up the user even before the state change.
Although the possibility is low, we should set the state before the
notifications.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-11-06 12:15:25 +01:00
Родитель 19566b0bd9
Коммит 9bc889b4ba
1 изменённых файлов: 4 добавлений и 4 удалений
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8
sound/core/pcm_native.c
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@ -1052,10 +1052,10 @@ static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
struct snd_pcm_runtime *runtime = substream->runtime;
if (runtime->status->state != state) {
snd_pcm_trigger_tstamp(substream);
runtime->status->state = state;
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
&runtime->trigger_tstamp);
runtime->status->state = state;
}
wake_up(&runtime->sleep);
wake_up(&runtime->tsleep);
@ -1204,11 +1204,11 @@ static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->status->suspended_state = runtime->status->state;
runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
&runtime->trigger_tstamp);
runtime->status->suspended_state = runtime->status->state;
runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
wake_up(&runtime->sleep);
wake_up(&runtime->tsleep);
}
@ -1311,10 +1311,10 @@ static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
{
struct snd_pcm_runtime *runtime = substream->runtime;
snd_pcm_trigger_tstamp(substream);
runtime->status->state = runtime->status->suspended_state;
if (substream->timer)
snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
&runtime->trigger_tstamp);
runtime->status->state = runtime->status->suspended_state;
}
static struct action_ops snd_pcm_action_resume = {