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authorMauro Carvalho Chehab <mchehab@infradead.org>2008-06-14 09:41:18 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2008-06-26 15:58:47 -0300
commit83ee87a31dc43a5fd6dee3562c146033c3a4cb39 (patch)
tree3c8070786261f4994209328901bda6b183077e3c /drivers/media/video/em28xx/em28xx-audio.c
parent913f5fc209247b607b1994a710315966f4f9d358 (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/em28xx/em28xx-audio.c')
-rw-r--r--drivers/media/video/em28xx/em28xx-audio.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c
index 343dff0f8a0..3c006103c1e 100644
--- a/drivers/media/video/em28xx/em28xx-audio.c
+++ b/drivers/media/video/em28xx/em28xx-audio.c
@@ -268,6 +268,12 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
dprintk("opening device and trying to acquire exclusive lock\n");
+ if (!dev) {
+ printk(KERN_ERR "BUG: em28xx can't find device struct."
+ " Can't proceed with open\n");
+ return -ENODEV;
+ }
+
/* Sets volume, mute, etc */
dev->mute = 0;