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ALSA: pcm: Allow dropping stream directly after resume

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So far, the PCM core refuses DROP ioctl when the stream in the
suspended state.  This was basically to avoid the invalid state change
*during* the suspend.  But since we protect the power change globally
in the common PCM ioctl caller side, it's guaranteed that
snd_pcm_drop() is called at the right power state.  So we can assume
that the drop of stream is safe immediately after SUSPENDED state.

Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-05-24 15:08:31 +02:00
parent 68b4acd322
commit 4b95ff781e
1 changed files with 1 additions and 2 deletions
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3
sound/core/pcm_native.c
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@ -1883,8 +1883,7 @@ static int snd_pcm_drop(struct snd_pcm_substream *substream)
runtime = substream->runtime;
if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
return -EBADFD;
snd_pcm_stream_lock_irq(substream);