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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>
This commit is contained in:
Douglas Schilling Landgraf 2009-02-08 01:11:13 -03:00 committed by Mauro Carvalho Chehab
parent df39ca6437
commit bf510ac380
1 changed files with 3 additions and 1 deletions
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4
drivers/media/video/em28xx/em28xx-audio.c
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@ -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);