V4L/DVB (7164): em28xx-alsa: Add a missing mutex

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 2c7343d3139..8c67f678266 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -269,8 +269,11 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
         dprintk("opening device and trying to acquire exclusive lock\n");
 
         /* Sets volume, mute, etc */
+
         dev->mute = 0;
+        mutex_lock(&dev->lock);
         ret = em28xx_audio_analog_set(dev);
+        mutex_unlock(&dev->lock);
         if (ret < 0)
                 goto err;
 
@@ -302,7 +305,9 @@ static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
         dprintk("closing device\n");
 
         dev->mute = 1;
+        mutex_lock(&dev->lock);
         em28xx_audio_analog_set(dev);
+        mutex_unlock(&dev->lock);
 
         if (dev->adev->users == 0 && dev->adev->shutdown == 1) {
                 dprintk("audio users: %d\n", dev->adev->users);