From 46ef1956475fd62f21ee67b3f49dbfe2a60fa13d Mon Sep 17 00:00:00 2001 From: Alban Browaeys Date: Fri, 24 Feb 2012 17:12:45 +0000 Subject: [PATCH] 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 Signed-off-by: Chris Wilson Reviewed-by: Jesse Barnes Signed-off-by: Jesse Barnes Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_display.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index fed87d6a5b99..e4b25861a12a 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5265,7 +5265,7 @@ 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 */ -- 2.11.0