linuxaudio.org

Hi Rods,
On Wed, Feb 2, 2011 at 1:08 PM, Rods Bobavich  wrote:

quoted text
> I was looking at the wrong urb.c file. The correct one is

> linux-kernel/sound/usb/urb.c

> Actually the KERN_ERR is on 138 for my version triggers as line 146...

> On line 460 is the second KERN_ERR.

> This is all in a function called retire_capture_urb()

Which kernel?
> It appears that there is a commented continue that would drastically change

quoted text
> the for-loop this one is in. I wonder... Could this be the offending line?

> If I'm reading the code correctly it appears to be some sort of locking

> mechanism check while retiring the urb from use to make sure it is retired

> when it is no longer active. Without the continue the urb will still be

> retired. Perhaps this is causing something unstable?

> Clemens might know more about this. I'm not that familiar with kernel code.

Shooting from the hip (and also digging in 2.6.26.5 sources)... looks

like there was a timeout when calling usb_set_interface()

(drivers/usb/core/message.c).  The urb transfers look like they

stalled rather than failed to allocate bandwidth.  That makes me think

there's a bad cable, bad USB controller, bad USB controller /driver/,

bad format request, bad device, or something like that.
-gabriel

_______________________________________________

Linux-audio-dev mailing list

Linux-audio-dev@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-dev