[alsa-devel] [PATCH 3/6] ALSA: bebob: change the range of critical section for stream data in PCM.hw_free callback

[Takashi Sakamoto]

The operation of duplex streams should be in critical section.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 sound/firewire/bebob/bebob_pcm.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/sound/firewire/bebob/bebob_pcm.c b/sound/firewire/bebob/bebob_pcm.c
index 530db7a7844c..e21de44deaa9 100644
--- a/sound/firewire/bebob/bebob_pcm.c
+++ b/sound/firewire/bebob/bebob_pcm.c
@@ -213,14 +213,15 @@ static int pcm_hw_free(struct snd_pcm_substream *substream)
 {
 	struct snd_bebob *bebob = substream->private_data;
 
-	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) {
-		mutex_lock(&bebob->mutex);
+	mutex_lock(&bebob->mutex);
+
+	if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
 		bebob->substreams_counter--;
-		mutex_unlock(&bebob->mutex);
-	}
 
 	snd_bebob_stream_stop_duplex(bebob);
 
+	mutex_unlock(&bebob->mutex);
+
 	return snd_pcm_lib_free_vmalloc_buffer(substream);
 }
 
-- 
2.20.1