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-rw-r--r--mm/swap_state.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 3863acd6189c..3d76d80c07d6 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -323,6 +323,10 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
if (found_page)
break;
+ /* Just skip read ahead for unused swap slot */
+ if (!__swp_swapcount(entry))
+ return NULL;
+
/*
* Get a new page to read into from swap.
*/