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[media] em28xx-audio: fix user counting in snd_em28xx_capture_open() 

dev->adev.users always needs to be increased when snd_em28xx_capture_open() is
called and succeeds.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
hifive-unleashed-5.1
Frank Schaefer 2014-01-17 14:18:42 -03:00 committed by Mauro Carvalho Chehab
parent 1d184b0bc1
commit 01ae3b51af
1 changed files with 11 additions and 11 deletions
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22
drivers/media/usb/em28xx/em28xx-audio.c
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@ -252,7 +252,7 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
{
struct em28xx *dev = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
int ret = 0;
int nonblock, ret = 0;
if (!dev) {
em28xx_err("BUG: em28xx can't find device struct."
@ -265,15 +265,15 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
dprintk("opening device and trying to acquire exclusive lock\n");
nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
runtime->hw = snd_em28xx_hw_capture;
if ((dev->alt == 0 || dev->is_audio_only) && dev->adev.users == 0) {
int nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
if (!mutex_trylock(&dev->lock))
return -EAGAIN;
} else
mutex_lock(&dev->lock);
if (dev->is_audio_only)
/* vendor audio is on a separate interface */
dev->alt = 1;
@ -299,11 +299,11 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
ret = em28xx_audio_analog_set(dev);
if (ret < 0)
goto err;
dev->adev.users++;
mutex_unlock(&dev->lock);
}
dev->adev.users++;
mutex_unlock(&dev->lock);
/* Dynamically adjust the period size */
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,