out_err:
        new_man = ttm_manager_type(bdev, bo->mem.mem_type);
-       if (!new_man->use_tt) {
-               ttm_tt_destroy(bdev, bo->ttm);
-               bo->ttm = NULL;
-       }
+       if (!new_man->use_tt)
+               ttm_bo_tt_destroy(bo);
 
        return ret;
 }
        if (bo->bdev->driver->move_notify)
                bo->bdev->driver->move_notify(bo, false, NULL);
 
-       ttm_tt_destroy(bo->bdev, bo->ttm);
-       bo->ttm = NULL;
+       ttm_bo_tt_destroy(bo);
        ttm_resource_free(bo, &bo->mem);
 }
 
        while (ttm_bo_swapout(&ttm_bo_glob, &ctx) == 0);
 }
 EXPORT_SYMBOL(ttm_bo_swapout_all);
+
+void ttm_bo_tt_destroy(struct ttm_buffer_object *bo)
+{
+       ttm_tt_destroy(bo->bdev, bo->ttm);
+       bo->ttm = NULL;
+}
 
        *old_mem = *new_mem;
        new_mem->mm_node = NULL;
 
-       if (!man->use_tt) {
-               ttm_tt_destroy(bdev, ttm);
-               bo->ttm = NULL;
-       }
+       if (!man->use_tt)
+               ttm_bo_tt_destroy(bo);
 
 out1:
        ttm_resource_iounmap(bdev, old_mem, new_iomap);
                if (ret)
                        return ret;
 
-               if (!man->use_tt) {
-                       ttm_tt_destroy(bdev, bo->ttm);
-                       bo->ttm = NULL;
-               }
+               if (!man->use_tt)
+                       ttm_bo_tt_destroy(bo);
                ttm_bo_free_old_node(bo);
        } else {
                /**
                if (ret)
                        return ret;
 
-               if (!to->use_tt) {
-                       ttm_tt_destroy(bdev, bo->ttm);
-                       bo->ttm = NULL;
-               }
+               if (!to->use_tt)
+                       ttm_bo_tt_destroy(bo);
                ttm_bo_free_old_node(bo);
        }