drm/amdgpu: max_pde_used usage should be under protect

Need to take the lock when accessing this.

Signed-off-by: monk.liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <jammy.zhou@amd.com>
This commit is contained in:
monk.liu 2015-05-26 10:22:41 +08:00 • committed by Alex Deucher
commit 3d5a08c114