tree 2962c85ed9fc2f5a0e9ae92990eacff95a31bb7c
parent 54ec1882778015ab1e811d858c68a521dba409c5
author Mathias Nyman <mathias.nyman@linux.intel.com> 1378368080 +0300
committer Matthias Kaehlcke <mka@google.com> 1436567184 -0700

xhci: Fix oops happening after address device timeout

commit 284d20552461466b04d6bfeafeb1c47a8891b591 upstream.

When a command times out, the command ring is first aborted,
and then stopped. If the command ring is empty when it is stopped
the stop event will point to next command which is not yet set.
xHCI tries to handle this next event often causing an oops.

Don't handle command completion events on stopped cmd ring if ring is
empty.

This patch should be backported to kernels as old as 3.7, that contain
the commit b92cc66c047ff7cf587b318fe377061a353c120f "xHCI: add aborting
command ring function"

Change-Id: I1afc76d6ea77e879140730a0078e2d9a56a92ee3
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Reported-by: Giovanni <giovanni.nervi@yahoo.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>