A tricky problem the dummy_hcd driver has to solve is keeping track of the
usb_device structure that corresponds to a registered gadget.  Right now
that's not done very robustly.  This patch stores the address of the
structure when a new URB is submitted and also acquires a reference to
make sure that completing the final URB won't deallocate the structure
before dummy_hcd is through with it.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>