drm/amdgpu:protect cs submit

to prevent submit two or more IBs with PREEMPT flags.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Monk Liu 2017-03-08 15:51:13 +08:00 • committed by Alex Deucher
commit 9a1b3af10d