From a5f0c485731823506fffd3cc881e3f8f212eea41 Mon Sep 17 00:00:00 2001 From: Frank Schaefer Date: Fri, 17 Jan 2014 14:18:42 -0300 Subject: [PATCH] media: em28xx-audio: fix user counting in snd_em28xx_capture_open() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit 01ae3b51af7144ea29eb28ba718b65ad59ab9493 upstream. dev->adev.users always needs to be increased when snd_em28xx_capture_open() is called and succeeds. Signed-off-by: Frank Schäfer Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/em28xx/em28xx-audio.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-audio.c b/drivers/media/usb/em28xx/em28xx-audio.c index 05e9bd1..dfdfa77 100644 --- a/drivers/media/usb/em28xx/em28xx-audio.c +++ b/drivers/media/usb/em28xx/em28xx-audio.c @@ -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, -- 2.7.4