From: Oleksij Rempel <linux@rempel-privat.de>
Date: Sun, 21 Jul 2013 13:36:19 +0000 (+0200)
Subject: xhci: fix null pointer dereference on ring_doorbell_for_active_rings
X-Git-Tag: v3.2.50~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68a127fb3d6c045ae4e464e6e1c79c568c2aa031;p=pandora-kernel.git

xhci: fix null pointer dereference on ring_doorbell_for_active_rings

commit d66eaf9f89502971fddcb0de550b01fa6f409d83 upstream.

in some cases where device is attched to xhci port and do not responding,
for example ath9k_htc with stalled firmware, kernel will
crash on ring_doorbell_for_active_rings.
This patch check if pointer exist before it is used.

This patch should be backported to kernels as old as 2.6.35, that
contain the commit e9df17eb1408cfafa3d1844bfc7f22c7237b31b8 "USB: xhci:
Correct assumptions about number of rings per endpoint"

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

Reading git-diff-tree failed