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ALSA: pcm: Fix avail to return error if stream is suspended 

When the stream is in suspended state some applications wait
on "Stream Pipe Error" in response to snd_pcm_avail call to
resume the stream.

In the current implementation snd_pcm_avail() returns zero
when the stream is in suspended state. This causes application
to enter in infinite loop for frames to be available.

"Stream pipe Error" code is getting returned for read/write
call when the stream is in suspended state. Similarly update
snd_pcm_avail to return -ESTRPIPE.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jeeja KP 2016-09-02 21:49:44 +05:30 committed by Takashi Iwai
parent 8c91d7d09e
commit f3f6c61452
1 changed files with 3 additions and 1 deletions
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4
sound/core/pcm_native.c
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@ -2637,9 +2637,11 @@ static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
break; break;
/* Fall through */ /* Fall through */
case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PREPARED:
case SNDRV_PCM_STATE_SUSPENDED:
err = 0; err = 0;
break; break;
case SNDRV_PCM_STATE_SUSPENDED:
err = -ESTRPIPE;
break;
case SNDRV_PCM_STATE_XRUN: case SNDRV_PCM_STATE_XRUN:
err = -EPIPE; err = -EPIPE;
break; break;