drm/amdgpu: block ttm first before parking scheduler

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -1936,6 +1936,9 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
 
 	atomic_inc(&adev->gpu_reset_counter);
 
+	/* block TTM */
+	resched = ttm_bo_lock_delayed_workqueue(&adev->mman.bdev);
+
 	/* block scheduler */
 	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
 		struct amdgpu_ring *ring = adev->rings[i];
@@ -1945,8 +1948,6 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
 		kthread_park(ring->sched.thread);
 	}
 
-	/* block TTM */
-	resched = ttm_bo_lock_delayed_workqueue(&adev->mman.bdev);
 
 	/* save scratch */
 	amdgpu_atombios_scratch_regs_save(adev);