From 4f7c39dc557cabdbc932ae83432cc225c480133c Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Mon, 21 May 2012 11:59:57 +0200
Subject: 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>
---
sound/core/pcm_native.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 3fe99e644eb..53b5ada8f7c 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -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)
{
- 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;
}
@@ -1379,6 +1386,9 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
case SNDRV_PCM_STATE_RUNNING:
runtime->status->state = SNDRV_PCM_STATE_DRAINING;
break;
+ case SNDRV_PCM_STATE_XRUN:
+ runtime->status->state = SNDRV_PCM_STATE_SETUP;
+ break;
default:
break;
}
--
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