Sebastian Andrzej Siewior wrote: > Arvid Brodin wrote: >> This removes the "qh is 0" printout. qh == NULL if the urb has >> been unlinked, so this condition is normal. > > If this is normal please add a comment where this happens. I tried to > remove the URB from the hardware so it does complete after removal. As far as I can see, what happens is that sometimes when unlinking (dequeueing) an urb with an active ptd, the ptd finishes while urb_dequeue() is executing within its spinlock, but before the ptd is zeroed out. This sets the interrupt flag for the ptd, and when the interrupt is later executed, priv->xxxints[x].qh for the ptd has been set to NULL by urb_dequeue(). It happens rather frequently when running the unlink tests in the usbtest suite. > > Sebastian -- Arvid Brodin Enea Services Stockholm AB -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
