Re: [Bug 14564] capture-example sleeping function called from invalid context at arch/x86/mm/fault.c

2010-01-04 Thread Sean 

bugzilla-dae...@bugzilla.kernel.org wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=14564


Jean-Francois Moine moin...@free.fr changed:

   What|Removed |Added

 CC||moin...@free.fr




--- Comment #22 from Jean-Francois Moine moin...@free.fr  2010-01-03 07:02:45 
---
Hello Sean,

Sorry to be a bit late. Looking at the dmesg, I found that the gspca version
was 2.7.0. May you upgrade your linux media stuff from LinuxTv.org and check if
this problem still occurs?

Jef
  

Jef,

I upgraded to the latest v4l-dvb from http://linuxtv.org/hg/v4l-dvb, 
made the kernel modules, made the v4l libraries, and recompiled 
capture-example.c. Gspca now shows 2.8.0. The error still persists. Alan 
Stern's latest patch to ohci-q.c traps the error. I think it is an issue 
with the cpu or usb controller on the Vortex86SX SoC.


Sean
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Re: [Bug 14564] capture-example sleeping function called from invalid context at arch/x86/mm/fault.c

2010-01-04 Thread Alan Stern 
On Mon, 4 Jan 2010, Sean wrote:

 Jef,
 
 I upgraded to the latest v4l-dvb from http://linuxtv.org/hg/v4l-dvb, 
 made the kernel modules, made the v4l libraries, and recompiled 
 capture-example.c. Gspca now shows 2.8.0. The error still persists. Alan 
 Stern's latest patch to ohci-q.c traps the error. I think it is an issue 
 with the cpu or usb controller on the Vortex86SX SoC.

The CPU is more likely than the USB controller.  The erroneous pointer 
values we see are virtual addresses, whereas the USB controller would 
probably write a physical (or DMA) address if it was malfunctioning.

Or it could be some bizarre timing problem with the memory bus, or 
something else equally obscure.  You didn't mention before that this 
was a SoC rather than an ordinary PC.

Alan Stern

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