[PATCH] mm/swap: fix wrong plist empty check in swap_alloc_slow()

[Youngjun Park <youngjun.park@lge.com>]

swap_alloc_slow() was checking `si->avail_list` instead of `next->avail_list`
when verifying if the next swap device is still in the list, which could cause
unnecessary restarts during allocation.

Fixes: 8e689f8ea45ff ("mm/swap: do not choose swap device according to numa node")
Signed-off-by: Youngjun Park <youngjun.park@lge.com>
---
 mm/swapfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 94e0f0c54168..cf780fefaf7d 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1374,7 +1374,7 @@ static bool swap_alloc_slow(swp_entry_t *entry,
 		 * still in the swap_avail_head list then try it, otherwise
 		 * start over if we have not gotten any slots.
 		 */
-		if (plist_node_empty(&si->avail_list))
+		if (plist_node_empty(&next->avail_list))
 			goto start_over;
 	}
 	spin_unlock(&swap_avail_lock);
-- 
2.34.1