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

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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>
Cc: stable@kernel.org
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Alban Browaeys 2012-02-24 17:12:45 +00:00 committed by Jesse Barnes
parent c0e2ee1bc0
commit aed3f09db3
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_display.c
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@ -6184,7 +6184,7 @@ void intel_crtc_load_lut(struct drm_crtc *crtc)
int i;
/* The clocks have to be on to load the palette. */
if (!crtc->enabled)
if (!crtc->enabled || !intel_crtc->active)
return;
/* use legacy palette for Ironlake */