drm/ttm: fix false positive assert

The assert sometimes incorrectly triggers when pinned BOs are destroyed.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Tested-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Link: https://patchwork.freedesktop.org/patch/356737/

drivers/gpu/drm/ttm/ttm_bo.c

@@ -151,8 +151,6 @@ static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,
 	struct ttm_bo_device *bdev = bo->bdev;
 	struct ttm_mem_type_manager *man;
 
-	dma_resv_assert_held(bo->base.resv);
-
 	if (!list_empty(&bo->lru))
 		return;
 
@@ -604,7 +602,8 @@ static void ttm_bo_release(struct kref *kref)
 		 */
 		if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {
 			bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;
-			ttm_bo_move_to_lru_tail(bo, NULL);
+			ttm_bo_del_from_lru(bo);
+			ttm_bo_add_mem_to_lru(bo, &bo->mem);
 		}
 
 		kref_init(&bo->kref);