From 8b53b7fb57e1ce3441b1a32f8374874b53c4bc31 Mon Sep 17 00:00:00 2001
From: Wolfram Stering <wolfram.stering@hale.at>
Date: Fri, 23 Sep 2011 14:09:35 +0200
Subject: [PATCH] mx3fb: fix NULL pointer dereference in screen blanking.

When blanking an already blanked framebuffer, a kernel NULL pointer
dereference occurred, because mx3fb driver handles all kinds of screen
blanking (normal, vsync suspend, powerdown) in the same way.
Certain programs (Xorg X11 server) first do a normal blank, followed by
a powerdown blank, which triggered the bug.

Add an additional safeguard and make sdc_disable_channel() safe against
multiple calls independent of other logic.

Signed-off-by: Michael Thalmeier <michael.thalmeier@hale.at>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
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