drm/ttm: Don't add swapped BOs to swap-LRU list

A BO that's already swapped would be added back to the swap-LRU list
for example if it validation failed under high memory pressure. This
could later lead to swapping it out again and leaking previous swap
storage.

This commit adds a condition to prevent that from happening.

Change-Id: I5f1fd06652ed8fc82f9f2c6c94ab3921a6c85b7a
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>

drivers/gpu/drm/ttm/ttm_bo.c

@@ -183,7 +183,8 @@ void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
 		list_add_tail(&bo->lru, &man->lru[bo->priority]);
 		kref_get(&bo->list_kref);
 
-		if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
+		if (bo->ttm && !(bo->ttm->page_flags &
+				 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED))) {
 			list_add_tail(&bo->swap,
 				      &bo->glob->swap_lru[bo->priority]);
 			kref_get(&bo->list_kref);