drm/amdgpu: if a GDS switch is needed emit a pipeline sync as well

Otherwise we might change the GDS settings while they are still in use.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

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

@@ -254,22 +254,24 @@ void amdgpu_vm_flush(struct amdgpu_ring *ring,
 {
 	struct amdgpu_device *adev = ring->adev;
 	struct amdgpu_vm_manager_id *mgr_id = &adev->vm_manager.ids[vm_id];
-
-	if (pd_addr != AMDGPU_VM_NO_FLUSH) {
-		trace_amdgpu_vm_flush(pd_addr, ring->idx, vm_id);
-		if (ring->funcs->emit_pipeline_sync)
-			amdgpu_ring_emit_pipeline_sync(ring);
-		amdgpu_ring_emit_vm_flush(ring, vm_id, pd_addr);
-	}
-
-	if (ring->funcs->emit_gds_switch && (
+	bool gds_switch_needed = ring->funcs->emit_gds_switch && (
 		mgr_id->gds_base != gds_base ||
 		mgr_id->gds_size != gds_size ||
 		mgr_id->gws_base != gws_base ||
 		mgr_id->gws_size != gws_size ||
 		mgr_id->oa_base != oa_base ||
-	    mgr_id->oa_size != oa_size)) {
+		mgr_id->oa_size != oa_size);
+
+	if (ring->funcs->emit_pipeline_sync && (
+	    pd_addr != AMDGPU_VM_NO_FLUSH || gds_switch_needed))
+		amdgpu_ring_emit_pipeline_sync(ring);
+
+	if (pd_addr != AMDGPU_VM_NO_FLUSH) {
+		trace_amdgpu_vm_flush(pd_addr, ring->idx, vm_id);
+		amdgpu_ring_emit_vm_flush(ring, vm_id, pd_addr);
+	}
 
+	if (gds_switch_needed) {
 		mgr_id->gds_base = gds_base;
 		mgr_id->gds_size = gds_size;
 		mgr_id->gws_base = gws_base;