Chipidea USB controller provides a means (Add dTD TripWire semaphore)
for safely adding a new dTD to an active endpoint's linked list.  Make
use of this feature to improve performance.  Dynamically allocate and
free dTD for supporting zero length packet termination.  Honor
no_interrupt flag set by gadget drivers.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>