[3.13.y-ckt stable] Patch "ALSA: pcm: Don't leave PREPARED state after draining" has been added to staging queue

Kamal Mostafa kamal at canonical.com
Tue Mar 31 18:46:56 UTC 2015

This is a note to let you know that I have just added a patch titled

    ALSA: pcm: Don't leave PREPARED state after draining

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.13.11-ckt18.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see



>From 45338288736ab94d862ba9edce7e5605308b56c3 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai at suse.de>
Date: Thu, 18 Dec 2014 10:02:41 +0100
Subject: ALSA: pcm: Don't leave PREPARED state after draining

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 at suse.de>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
 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 566b0f6..ee24057 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1404,6 +1404,8 @@ 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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