[ALSA] pcsp: locking fix

pcsp: locking fix.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/drivers/pcsp/pcsp_lib.c b/sound/drivers/pcsp/pcsp_lib.c
index a302756eac7c..54253e9b4b02 100644
--- a/sound/drivers/pcsp/pcsp_lib.c
+++ b/sound/drivers/pcsp/pcsp_lib.c
@@ -305,7 +305,9 @@ static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
                 return -EBUSY;
         }
         runtime->hw = snd_pcsp_playback;
+        spin_lock_irq(&chip->substream_lock);
         chip->playback_substream = substream;
+        spin_unlock_irq(&chip->substream_lock);
         return 0;
 }