Fwd: improve support for usb board camera

[Greg KH]

On Thu, Dec 11, 2014 at 07:43:15AM -0500, Kristopher Borer wrote:
> The kernel version is 3.13.0-32-generic

Ick, that's 68 thousand patches old (i.e. one year...)

Have you tried the 3.18 kernel release to see if it is better, because:

> 
> Here is one example:
> 
> BUG: unable to handle kernel NULL pointer dereference at...
> IP: [...] xhci_stream_id_to_ring+0x40/0x60
> PGD 362a1067 PUD c9f49067 PMD 0
> Oops: 0000 [#1] SMP
> Modules linked in: elo_mt_input_mod(0F) eeepc_wmi ...
> CPU: 1 PID: 20665 Comm: ... Tainted: GF W 0 3.13.0-32-generic #57-Ubuntu
> Hardware name: ASUS All Series/B85M-E, BIOS 2105 08/08/2014
> task: ...
> RIP: ... xhci_stream_id_to_ring+0x40/0x60
> ...
> Call Trace:
>   <IRQ>
>   handle_cmd_completion
>   xhci_irq
>   xhci_mis_irq
>   handle_irq_event_percpu
>   handle_irq_event
>   handle_edge_irq
>   handle_irq
>   do_IRQ
>   common_interrupt
>   <EOI>
> ...
> Kernel panic - not syncing: Fatal exception in interrupt
> Shutting down cpus with MMI

That's a xhci (the USB 3 controller) issue, and there have been lots of
xhci fixes in the past year as new controllers have been released and we
have fixed the bugs in them.

And you are using USB 3 streams in your USB 2 camera?  That doesn't make
sense.  What camera driver is this?

Anyway, please try 3.18, that should work.  If not, let's drag this over
to the linux-usb at vger.kernel.org mailing list as the xhci developers
should learn about this, it doesn't look like a media driver issue just
yet.

thanks,

greg k-h