From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-ee0-f47.google.com ([74.125.83.47]:55753 "EHLO mail-ee0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750937AbaAQRRq (ORCPT ); Fri, 17 Jan 2014 12:17:46 -0500 Received: by mail-ee0-f47.google.com with SMTP id d49so1480321eek.6 for ; Fri, 17 Jan 2014 09:17:45 -0800 (PST) From: =?UTF-8?q?Frank=20Sch=C3=A4fer?= To: m.chehab@samsung.com Cc: linux-media@vger.kernel.org, =?UTF-8?q?Frank=20Sch=C3=A4fer?= Subject: [PATCH 1/2] em28xx-audio: fix user counting in snd_em28xx_capture_open() Date: Fri, 17 Jan 2014 18:18:42 +0100 Message-Id: <1389979123-6919-1-git-send-email-fschaefer.oss@googlemail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-media-owner@vger.kernel.org List-ID: dev->adev.users always needs to be increased when snd_em28xx_capture_open() is called and succeeds. Signed-off-by: Frank Schäfer --- drivers/media/usb/em28xx/em28xx-audio.c | 22 +++++++++++----------- 1 Datei geändert, 11 Zeilen hinzugefügt(+), 11 Zeilen entfernt(-) 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, -- 1.7.10.4