From 3ed9a335cfc64b2c83545f341cdddf2347b12b97 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexdeucher@gmail.com>
Date: Tue, 15 Apr 2014 12:44:33 -0400
Subject: [PATCH] drm/radeon/pm: don't walk the crtc list before it has been
 initialized (v2)

Avoids a crash in certain cases when thermal irqs are generated
before the display structures have been initialized.

v2: fix the vblank and vrefresh helpers as well

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=73931

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
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