drm/amdgpu: partial revert VM sync changes

We still need to add the VM update fences to the root PD.

So make sure to never sync to those implicitely.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -249,6 +249,11 @@ int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
 		    owner != AMDGPU_FENCE_OWNER_UNDEFINED)
 			continue;
 
+		/* Never sync to VM updates either. */
+		if (fence_owner == AMDGPU_FENCE_OWNER_VM &&
+		    owner != AMDGPU_FENCE_OWNER_UNDEFINED)
+			continue;
+
 		/* Ignore fences depending on the sync mode */
 		switch (mode) {
 		case AMDGPU_SYNC_ALWAYS: