drm/amdgpu: sync fence of clear_invalids (v2)

bo_va may un-initialized, fix it.
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>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -2268,7 +2268,7 @@ int amdgpu_vm_update_page_directory(struct amdgpu_device *adev,
 int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
 				struct amdgpu_vm *vm);
 int amdgpu_vm_clear_invalids(struct amdgpu_device *adev,
-				struct amdgpu_vm *vm);
+				struct amdgpu_vm *vm, struct amdgpu_sync *sync);
 int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 			struct amdgpu_bo_va *bo_va,
 			struct ttm_mem_reg *mem);

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

@@ -520,7 +520,7 @@ static int amdgpu_bo_vm_update_pte(struct amdgpu_cs_parser *p,
 
 		amdgpu_sync_fence(&p->ibs[0].sync, bo_va->last_pt_update);
 	}
-	return amdgpu_vm_clear_invalids(adev, vm);
+	return amdgpu_vm_clear_invalids(adev, vm, &p->ibs[0].sync);
 }
 
 static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,

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

@@ -858,9 +858,9 @@ int amdgpu_vm_clear_freed(struct amdgpu_device *adev,
  * PTs have to be reserved and mutex must be locked!
  */
 int amdgpu_vm_clear_invalids(struct amdgpu_device *adev,
-			     struct amdgpu_vm *vm)
+			     struct amdgpu_vm *vm, struct amdgpu_sync *sync)
 {
-	struct amdgpu_bo_va *bo_va;
+	struct amdgpu_bo_va *bo_va = NULL;
 	int r;
 
 	spin_lock(&vm->status_lock);
@@ -877,6 +877,8 @@ int amdgpu_vm_clear_invalids(struct amdgpu_device *adev,
 	}
 	spin_unlock(&vm->status_lock);
 
+	if (bo_va)
+		amdgpu_sync_fence(sync, bo_va->last_pt_update);
 	return 0;
 }