asynchronously cancel transfer requests en masse
void usb_unlink_anchored_urbs (
|struct usb_anchor * anchor|
anchor the requests are bound to
this allows all outstanding URBs to be unlinked starting
from the back of the queue. This function is asynchronous.
The unlinking is just triggered. It may happen after this
function has returned.
This routine should not be called by a driver after its disconnect
method has returned.