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V4L/DVB (10520): em28xx-audio: Add spinlock for trigger

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Added spinlock for trigger session

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 14:17:15 -03:00 committed by Mauro Carvalho Chehab
parent c744dff260
commit df39ca6437
1 changed files with 11 additions and 3 deletions
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14
drivers/media/video/em28xx/em28xx-audio.c
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@ -381,19 +381,27 @@ static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct em28xx *dev = snd_pcm_substream_chip(substream);
int retval;
dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)?
"start": "stop");
spin_lock(&dev->adev.slock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1);
return 0;
retval = 0;
break;
case SNDRV_PCM_TRIGGER_STOP:
em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0);
return 0;
retval = 0;
break;
default:
return -EINVAL;
retval = -EINVAL;
}
spin_unlock(&dev->adev.slock);
return retval;
}
static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream