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 its 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.

v2: Check page_flags instead of swap_storage

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 2eb71ff..62518b6 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -170,7 +170,8 @@ 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);