linux-kernel - [PATCH 5.11 020/775] ALSA: pcm: Assure sync with the pending stop operation at suspend

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Date:   Mon,  1 Mar 2021 17:03:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.11 020/775] ALSA: pcm: Assure sync with the pending stop operation at suspend

From: Takashi Iwai <tiwai@...e.de>

commit 2c87c1a49c9d113a9f3e8e951d7d64be5ff50ac1 upstream.

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@...r.kernel.org>
Link: https://lore.kernel.org/r/20210206203656.15959-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/core/pcm_native.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1615,6 +1615,7 @@ static int snd_pcm_do_suspend(struct snd
 	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 *
 				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 s
 	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 = {