From: Emil Velikov <emil.l.velikov@gmail.com>
Date: Thu, 25 Aug 2011 20:36:51 +0000 (+0100)
Subject: drm/nv04/crtc: Bail out if FB is not bound to crtc
X-Git-Tag: v3.1-rc6~1^2~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e83bb4eee1c504ab98367b4f7d1bc337ab213d2;p=pandora-kernel.git

drm/nv04/crtc: Bail out if FB is not bound to crtc

This commit resolves a possible 'NULL pointer dereference'
It uses the same approach as radeon, intel and nouveau/nv50

Fixes bug 'Nouveau: Kernel oops when unplugging external monitor'
https://bugs.freedesktop.org/show_bug.cgi?id=40336

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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