BUG: Freeze upon loading bttv module

Lorenz Röhrl
2013-11-09T16:24:14Z

Hi,

i'm having problems loading the bttv-module for my bt878 based DVB-T
card: my system just freezes. Magic-Syskeys also won't work then.
With kernel 3.9.0 this worked just fine. Versions 3.10, 3.11 and 3.12
won't work.

Last messages on screen with 3.12 upon booting/loading the module is:
http://abload.de/img/bttv_freezeqxdn2.png

With kernel 3.9 i get an additional line on module loading and the
device works fine:
[ 1.895037] bttv: 0: add subdevice "dvb0"

I traced the problem, it dies somewhere in v4l2_ctrl_handler_setup on
line 4169
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/media/pci/bt8xx/bttv-driver.c#n4169

lspci output from kernel 3.9:
[...]
04:01.0 Multimedia video controller: Brooktree Corporation Bt878 Video
Capture (rev 11)
Subsystem: Twinhan Technology Co. Ltd VisionPlus DVB card
Flags: bus master, medium devsel, latency 32, IRQ 16
Memory at f0401000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Kernel driver in use: bttv
Kernel modules: bttv

04:01.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture
(rev 11)
Subsystem: Twinhan Technology Co. Ltd VisionPlus DVB Card
Flags: bus master, medium devsel, latency 32, IRQ 16
Memory at f0400000 (32-bit, prefetchable) [size=4K]
Capabilities: [44] Vital Product Data
Capabilities: [4c] Power Management version 2
Kernel driver in use: bt878
Kernel modules: bt878

Please CC me as i'm not subscribed to the list.

Thanks!

- Lorenz