From fe78118c4603ab91b88907eaabe4a1ca03a9f220 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 3 Sep 2013 18:19:42 -0400
Subject: [PATCH] drm/radeon: protect concurrent smc register access with a
 spinlock

smc registers are access indirectly via the main mmio aperture, so
there may be problems with concurrent access.  This adds a spinlock
to protect access to this register space.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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