3.16.57-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Felix Kuehling <Felix.Kuehling@xxxxxxx>
commit fd5002d6a3c602664b07668a24df4ef7a43bf078 upstream.
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@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -175,7 +175,8 @@ void ttm_bo_add_to_lru(struct ttm_buffer
list_add_tail(&bo->lru, &man->lru);
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);
kref_get(&bo->list_kref);
}
