From 01ae3b51af7144ea29eb28ba718b65ad59ab9493 Mon Sep 17 00:00:00 2001
From: Frank Schaefer <fschaefer.oss@googlemail.com>
Date: Fri, 17 Jan 2014 14:18:42 -0300
Subject: [PATCH] [media] em28xx-audio: fix user counting in
snd_em28xx_capture_open()
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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>
---
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 05e9bd11a3ff..dfdfa772eb1e 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,
--
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