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Subject[PATCH 3.2 054/153] drm/ttm: Don't add swapped BOs to swap-LRU list
3.2.102-rc1 review patch.  If anyone has any objections, please let me know.


From: Felix Kuehling <>

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

This commit adds a condition to prevent that from happening.

v2: Check page_flags instead of swap_storage

Signed-off-by: Felix Kuehling <>
Reviewed-by: Christian König <>
Signed-off-by: Alex Deucher <>
[bwh: Backported to 3.2: We aren't checking for TTM_PAGE_FLAG_SG here as that's
not defined]
Signed-off-by: Ben Hutchings <>
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -184,7 +184,7 @@ void ttm_bo_add_to_lru(struct ttm_buffer
list_add_tail(&bo->lru, &man->lru);

- if (bo->ttm != NULL) {
+ if (bo->ttm && !(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
list_add_tail(&bo->swap, &bo->glob->swap_lru);
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