From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 3 Sep 2013 22:19:42 +0000 (-0400)
Subject: drm/radeon: protect concurrent smc register access with a spinlock
X-Git-Tag: v3.12-rc2~17^2~6^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe78118c4603ab91b88907eaabe4a1ca03a9f220;p=pandora-kernel.git

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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