[coreboot] Patch merged into coreboot/master: af169f4 libpayload: ehci: Prevent some race conditions

the following patch was just integrated into master:
commit af169f4dd515f52e26c4c476c3340a710db69887
Author: Nico Huber 
Date:   Thu Nov 22 11:14:03 2012 +0100

libpayload: ehci: Prevent some race conditions

Prevent race conditions, when an interrupt-queue underrun occurred and
    the controller is currently working on our queue head or a transfer is
    still in progress.

Change-Id: Ia14f80a08071306ee5d1349780be081bfacb206a
    Signed-off-by: Nico Huber 
    Reviewed-on: http://review.coreboot.org/1902
    Reviewed-by: Patrick Georgi 
    Tested-by: build bot (Jenkins)

Reviewed-By: Patrick Georgi  at Fri Nov 23 15:20:19 2012, giving +2
See http://review.coreboot.org/1902 for details.

-gerrit