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authorDouglas Schilling Landgraf <dougsland@redhat.com>2009-02-08 01:11:13 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-03-30 12:42:44 -0300
commitbf510ac380c0e5aac813455fdf7364613cf75b72 (patch)
tree6d72328d2d26cff463258e849eebabd7534cecba
parentdf39ca6437410b9428ebd3ce30fcde193782410d (diff)
V4L/DVB (10521): em28xx-audio: Add lock for users
Added lock for users count Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--drivers/media/video/em28xx/em28xx-audio.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 8e9957dbdbe..38436af2164 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -313,7 +313,9 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
dprintk("changing alternate number to 7\n");
}
+ mutex_lock(&dev->lock);
dev->adev.users++;
+ mutex_unlock(&dev->lock);
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
dev->adev.capture_pcm_substream = substream;
@@ -328,12 +330,12 @@ err:
static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream)
{
struct em28xx *dev = snd_pcm_substream_chip(substream);
- dev->adev.users--;
dprintk("closing device\n");
dev->mute = 1;
mutex_lock(&dev->lock);
+ dev->adev.users--;
em28xx_audio_analog_set(dev);
mutex_unlock(&dev->lock);