[PATCH 5.11 021/775] ALSA: pcm: Dont call sync_stop if it hasnt been stopped

[Greg Kroah-Hartman]

From: Takashi Iwai <ti...@suse.de>

commit 700cb70730777c159a988e01daa93f20a1ae9b58 upstream.

The PCM stop operation sets the stop_operating flag for indicating the
sync_stop post-process.  This flag is, however, set unconditionally
even if the PCM trigger weren't issued.  This may lead to
inconsistency in the driver side.

Correct the code to set stop_operating flag only after the trigger
STOP is actually called.

Fixes: 1e850beea278 ("ALSA: pcm: Add the support for sync-stop operation")
Cc: <sta...@vger.kernel.org>
Link: https://lore.kernel.org/r/20210206203656.15959-4-ti...@suse.de
Signed-off-by: Takashi Iwai <ti...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 sound/core/pcm_native.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1421,8 +1421,10 @@ static int snd_pcm_do_stop(struct snd_pc
                           snd_pcm_state_t state)
 {
        if (substream->runtime->trigger_master == substream &&
-           snd_pcm_running(substream))
+           snd_pcm_running(substream)) {
                substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+               substream->runtime->stop_operating = true;
+       }
        return 0; /* unconditonally stop all substreams */
 }
 
@@ -1435,7 +1437,6 @@ static void snd_pcm_post_stop(struct snd
                runtime->status->state = state;
                snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
        }
-       runtime->stop_operating = true;
        wake_up(&runtime->sleep);
        wake_up(&runtime->tsleep);
 }