diff options
| author | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-06-14 09:41:18 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2008-06-26 15:58:47 -0300 |
| commit | 83ee87a31dc43a5fd6dee3562c146033c3a4cb39 (patch) | |
| tree | 3c8070786261f4994209328901bda6b183077e3c /drivers/media/video/saa7134/saa7134-alsa.c | |
| parent | 913f5fc209247b607b1994a710315966f4f9d358 (diff) | |
V4L/DVB (8026): Avoids an OOPS if dev struct can't be successfully recovered
On some alsa versions, it seems that snd_pcm_substream_chip(substream)
is returning a NULL pointer. This causes an OOPS, as reported by:
https://bugs.launchpad.net/ubuntu/+source/linux-ubuntu-modules-2.6.24/+bug/212271
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/212960
This patch avoids the OOPS by not letting and open() succeed.
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media/video/saa7134/saa7134-alsa.c')
| -rw-r--r-- | drivers/media/video/saa7134/saa7134-alsa.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/media/video/saa7134/saa7134-alsa.c b/drivers/media/video/saa7134/saa7134-alsa.c index ba3082422a0..f118de6e367 100644 --- a/drivers/media/video/saa7134/saa7134-alsa.c +++ b/drivers/media/video/saa7134/saa7134-alsa.c @@ -613,9 +613,15 @@ static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream) struct snd_pcm_runtime *runtime = substream->runtime; snd_card_saa7134_pcm_t *pcm; snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream); - struct saa7134_dev *dev = saa7134->dev; + struct saa7134_dev *dev; int amux, err; + if (!saa7134) { + printk(KERN_ERR "BUG: saa7134 can't find device struct." + " Can't proceed with open\n"); + return -ENODEV; + } + dev = saa7134->dev; mutex_lock(&dev->dmasound.lock); dev->dmasound.read_count = 0; |