drm/radeon/cik: use a mutex to properly lock srbm instanced registers
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 6 Aug 2013 16:40:16 +0000 (12:40 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Wed, 7 Aug 2013 21:37:18 +0000 (17:37 -0400)
We need proper locking in the driver when accessing instanced
registers on CIK.

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

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