Re: 3.15.6 USB issue with pwc cam

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Hans,

On Tuesday 12 August 2014 17:38:55 Hans Verkuil wrote:
> On 08/12/2014 05:07 PM, Hans de Goede wrote:
> > On 08/07/2014 04:49 PM, Udo van den Heuvel wrote:
> >> On 2014-08-04 11:17, Laurent Pinchart wrote:
> >>> (CC'ing Hans de Goede, the pwc maintainer, and the linux-media mailing
> >>> list)
> >
> > Thanks for the bug report. I've been looking into this, and there
> > seem to be 2 problems:
> > 
> > 1: xhci_hcd 0000:02:00.0: ERROR: unexpected command completion code 0x11.
> > 
> > This seems to be what is causing things to not work with a usb-3 port
> > for you. Might be fixed by this commit:
> > https://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/drivers
> > /usb/host?h=usb-next&id=3213b151387df0b95f4eada104f68eb1c1409cb3
> > 
> > Can you please do "lspci -nn", and then copy and paste the output here,
> > so that we can see what sort of xhci controller you've (and try to
> > reproduce the problem).
> > 
> > 2: The triggering of a WARN_ON in __vb2_queue_cancel() when called on
> > streamoff. I've been looking at the code and I cannot figure out why this
> > is triggering I'm afraid.
> 
> You can ignore this one.
> 
> The uvc driver is doing messy things with vb2 which causes this warning.
> That said, it will not break things for you. It is just a warning that the
> driver needs to be improved.

I can certainly take the blame when my code needs to be improved, but in this 
case the webcam is supported by the pwc driver, not the uvc driver :-)

-- 
Regards,

Laurent Pinchart