[PATCH 3.4 049/172] ALSA: pcm: Don't leave PREPARED state after draining

From: lizf
Date: Tue Jun 16 2015 - 05:29:42 EST

From: Takashi Iwai <tiwai@xxxxxxx>

3.4.108-rc1 review patch. If anyone has any objections, please let me know.


commit 70372a7566b5e552dbe48abdac08c275081d8558 upstream.

When a PCM draining is performed to an empty stream that has been
already in PREPARED state, the current code just ignores and leaves as
it is, although the drain is supposed to set all such streams to SETUP
state. This patch covers that overlooked case.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
sound/core/pcm_native.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 3a90793..65195a1 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1382,6 +1382,8 @@ static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
if (! snd_pcm_playback_empty(substream)) {
snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
+ } else {
+ runtime->status->state = SNDRV_PCM_STATE_SETUP;

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