From 4c1e45b88d04eb89046694e08e8af4effb87d7c5 Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@linux.intel.com>
Date: Thu, 30 Apr 2015 17:16:02 +0300
Subject: [PATCH] xhci: fix isoc endpoint dequeue from advancing too far on
 transaction error

commit d104d0152a97fade389f47635b73a9ccc7295d0b upstream.

Isoc TDs usually consist of one TRB, sometimes two. When all goes well we
receive only one success event for a TD, and move the dequeue pointer to
the next TD.

This fails if the TD consists of two TRBs and we get a transfer error
on the first TRB, we will then see two events for that TD.

Fix this by making sure the event we get is for the last TRB in that TD
before moving the dequeue pointer to the next TD. This will resolve some
of the uvc and dvb issues with the
"ERROR Transfer event TRB DMA ptr not part of current TD" error message

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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