diff options
| author | Takashi Iwai <tiwai@suse.de> | 2014-05-05 11:20:05 -0300 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-07-02 12:06:23 +0200 |
| commit | 30d8ffb3f0b2d340f782d464fb35323fb915b593 (patch) | |
| tree | 7bce8196e9e242290f67e1d8f1f2798ab1f5d358 /drivers/media | |
| parent | 957bd4c349be6d8dc9b7ae477543e5a7e1596573 (diff) | |
| download | lwn-30d8ffb3f0b2d340f782d464fb35323fb915b593.tar.gz lwn-30d8ffb3f0b2d340f782d464fb35323fb915b593.zip | |
media: ivtv: Fix Oops when no firmware is loaded
commit deb29e90221a6d4417aa67be971613c353180331 upstream.
When ivtv PCM device is accessed at the state where no firmware is
loaded, it oopses like:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000050
IP: [<ffffffffa049a881>] try_mailbox.isra.0+0x11/0x50 [ivtv]
Call Trace:
[<ffffffffa049aa20>] ivtv_api_call+0x160/0x6b0 [ivtv]
[<ffffffffa049af86>] ivtv_api+0x16/0x40 [ivtv]
[<ffffffffa049b10c>] ivtv_vapi+0xac/0xc0 [ivtv]
[<ffffffffa049d40d>] ivtv_start_v4l2_encode_stream+0x19d/0x630 [ivtv]
[<ffffffffa0530653>] snd_ivtv_pcm_capture_open+0x173/0x1c0 [ivtv_alsa]
[<ffffffffa04526f1>] snd_pcm_open_substream+0x51/0x100 [snd_pcm]
[<ffffffffa0452853>] snd_pcm_open+0xb3/0x260 [snd_pcm]
[<ffffffffa0452a37>] snd_pcm_capture_open+0x37/0x50 [snd_pcm]
[<ffffffffa033f557>] snd_open+0xa7/0x1e0 [snd]
[<ffffffff8118a628>] chrdev_open+0x88/0x1d0
[<ffffffff811840be>] do_dentry_open+0x1de/0x270
[<ffffffff81193a73>] do_last+0x1c3/0xec0
[<ffffffff81194826>] path_openat+0xb6/0x670
[<ffffffff81195b65>] do_filp_open+0x35/0x80
[<ffffffff81185449>] do_sys_open+0x129/0x210
[<ffffffff815b782d>] system_call_fastpath+0x1a/0x1f
This patch adds the check of firmware at PCM open callback like other
open callbacks of this driver.
Bugzilla: https://apibugzilla.novell.com/show_bug.cgi?id=875440
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/pci/ivtv/ivtv-alsa-pcm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-alsa-pcm.c b/drivers/media/pci/ivtv/ivtv-alsa-pcm.c index e1863dbf4edc..7a9b98bc208b 100644 --- a/drivers/media/pci/ivtv/ivtv-alsa-pcm.c +++ b/drivers/media/pci/ivtv/ivtv-alsa-pcm.c @@ -159,6 +159,12 @@ static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream) /* Instruct the CX2341[56] to start sending packets */ snd_ivtv_lock(itvsc); + + if (ivtv_init_on_first_open(itv)) { + snd_ivtv_unlock(itvsc); + return -ENXIO; + } + s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM]; v4l2_fh_init(&item.fh, s->vdev); |