Re: [Bug] 0ac8:0321 Vimicro generic vc0321 Camera is not working and causes crashes since 3.2

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 09/17/2013 08:25 PM, Frank Dierich wrote:
>> On 09/09/2013 02:09 PM, Hans de Goede wrote:
>>> Thanks for the bug report, looking at the bug reports, they all report an error of -71 which is
>>> EPROTO, which typically means something is wrong at the USB level.
>>>
>>> And nothing has changed for the driver in question between 3.1 and 3.2 , so I believe this regression
>>> is caused by changes to the usb sub-system, likely changes to the EHCI driver.
> I have tested the new 3.12.0-rc1 kernel and the regression is still present. It causes that Cheese crashes with a segmentation fault and I get the following errors
>
> [  139.868628] gspca_main: ISOC data error: [21] len=0, status=-71
> [  139.904620] gspca_main: ISOC data error: [12] len=0, status=-71
> [  139.936595] gspca_main: ISOC data error: [9] len=0, status=-71
> [  139.968576] gspca_main: ISOC data error: [17] len=0, status=-71
> [  140.036571] gspca_main: ISOC data error: [16] len=0, status=-71
> [  140.037364] video_source:sr[2570]: segfault at 8 ip 00007f0430d6868c sp 00007f0406c02900 error 4 in libgstreamer-0.10.so.0.30.0[7f0430d15000+de000]
> [  140.068533] gspca_main: ISOC data error: [24] len=0, status=-71
> [  140.104519] gspca_main: ISOC data error: [15] len=0, status=-71
> [  140.168474] gspca_main: ISOC data error: [20] len=0, status=-71
> [  140.200461] gspca_main: ISOC data error: [28] len=0, status=-71

Note I'm not claiming there is not problem, but since your testing indicated
that things broken between 3.1 and 3.2, I'm pretty sure that the breakage
is not caused by changes to the vimicro driver, as that driver was not
changed between 3.1 and 3.2.

As I already said in my previous mail, the best way forward with this is probably
to bisect the problem, and then send a mail to linux-usb@vger.kernel.org about this.
Please CC me on this mail.

Regards,

Hans