Patch merged into coreboot/master: 8c4d2f3 libpayload: Handle underruns in UHCI interrupt queues

the following patch was just integrated into master:
commit 8c4d2f36a339ba34c532e29696f2c5b70fb04957
Author: Nico Huber 
Date:   Tue Nov 20 17:49:00 2012 +0100

libpayload: Handle underruns in UHCI interrupt queues

If usb_poll() isn't called fast enough, the UHCI controller marks an
    underrun interrupt queue as done (terminating the queue at the head).
    We can recover from this situation, when usb_poll() gets called again,
    and the queue is processed.

Change-Id: Id56c9df44d6dbd53cd30ad89dfb5bf5977799829
    Signed-off-by: Nico Huber 
    Reviewed-on: http://review.coreboot.org/1898
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

Reviewed-By: Patrick Georgi  at Sat Nov 24 08:43:49 2012, giving +2
See http://review.coreboot.org/1898 for details.

-gerrit