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ALSA: pcm - Add proper state checks to snd_pcm_drain() 

The handling for some PCM states is missing for snd_pcm_drain().
At least, XRUN streams should be simply dropped to SETUP, and a few
initial invalid states should be rejected.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2012-05-21 11:59:57 +02:00
parent d4c6983859
commit 4f7c39dc55
1 changed files with 11 additions and 1 deletions
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12
sound/core/pcm_native.c
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@ -1360,7 +1360,14 @@ static int snd_pcm_prepare(struct snd_pcm_substream *substream,
static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
{ {
substream->runtime->trigger_master = substream; struct snd_pcm_runtime *runtime = substream->runtime;
switch (runtime->status->state) {
case SNDRV_PCM_STATE_OPEN:
case SNDRV_PCM_STATE_DISCONNECTED:
case SNDRV_PCM_STATE_SUSPENDED:
return -EBADFD;
}
runtime->trigger_master = substream;
return 0; return 0;
} }
@ -1379,6 +1386,9 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_RUNNING:
runtime->status->state = SNDRV_PCM_STATE_DRAINING; runtime->status->state = SNDRV_PCM_STATE_DRAINING;
break; break;
case SNDRV_PCM_STATE_XRUN:
runtime->status->state = SNDRV_PCM_STATE_SETUP;
break;
default: default:
break; break;
} }