[PATCH 3.13 049/198] [media] ivtv: Fix Oops when no firmware is loaded

From: Kamal Mostafa
Date: Tue Jul 15 2014 - 18:00:42 EST -stable review patch. If anyone has any objections, please let me know.


From: Takashi Iwai <tiwai@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/media/pci/ivtv/ivtv-alsa-pcm.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/media/pci/ivtv/ivtv-alsa-pcm.c b/drivers/media/pci/ivtv/ivtv-alsa-pcm.c
index e1863db..7a9b98b 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 */
+ 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);

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