From: Alban Browaeys <prahal@yahoo.com>
Date: Fri, 24 Feb 2012 17:12:45 +0000 (+0000)
Subject: drm/i915: Prevent a machine hang by checking crtc->active before loading lut
X-Git-Tag: v3.2.10~92
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c7554566fdd9b0aaff15dfda98e3a6706408a825;p=pandora-kernel.git

drm/i915: Prevent a machine hang by checking crtc->active before loading lut

commit aed3f09db39596e539f90b11a5016aea4d8442e1 upstream.

Before loading the lut (gamma), check the active state of intel_crtc,
otherwise at least on gen2 hang ensue.

This is reproducible in Xorg via:
  xset dpms force off
then
  xgamma -rgamma 2.0 # freeze.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44505
Signed-off-by: Alban Browaeys <prahal@yahoo.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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