On Fri, 31 Dec 2010, vichy wrote:

quoted text
> > But you don't need a detailed comparison to find out which URB timed
> > out.  You can tell by looking at the status code in the URB's
> > completion line; a timeout will set the status to -2.
> 
> I can see -2 on the log of usbmon right now.
> And it seems from usbmon_urb_complete
> but if the timeout happen, which function call usbmon_urb_complete?

usb_hcd_giveback_urb calls usbmon_urb_complete.  This is always true, 
regardless of whether the URB times out.

Alan Stern

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