[PATCH 2/4] ALSA: pcm: Assure sync with the pending stop operation at suspend

[Takashi Iwai]

The current PCM code calls the sync_stop at the resume action due to
the analogy to the PCM prepare call pattern.  But, it makes little
sense, as the sync should have been done rather at the suspend time,
not at the resume time.

This patch corrects the sync_stop call at suspend/resume to assure the
sync before finishing the suspend.

Fixes: 1e850beea278 ("ALSA: pcm: Add the support for sync-stop operation")
Cc: <stable at vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 sound/core/pcm_native.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 1f5acf08cdcd..cbbdb75c66ea 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1615,6 +1615,7 @@ static int snd_pcm_do_suspend(struct snd_pcm_substream *substream,
 	if (! snd_pcm_running(substream))
 		return 0;
 	substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
+	runtime->stop_operating = true;
 	return 0; /* suspend unconditionally */
 }
 
@@ -1691,6 +1692,12 @@ int snd_pcm_suspend_all(struct snd_pcm *pcm)
 				return err;
 		}
 	}
+
+	for (stream = 0; stream < 2; stream++)
+		for (substream = pcm->streams[stream].substream;
+		     substream; substream = substream->next)
+			snd_pcm_sync_stop(substream, false);
+
 	return 0;
 }
 EXPORT_SYMBOL(snd_pcm_suspend_all);
@@ -1736,7 +1743,6 @@ static void snd_pcm_post_resume(struct snd_pcm_substream *substream,
 	snd_pcm_trigger_tstamp(substream);
 	runtime->status->state = runtime->status->suspended_state;
 	snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
-	snd_pcm_sync_stop(substream, true);
 }
 
 static const struct action_ops snd_pcm_action_resume = {
-- 
2.26.2