mm/swapfile:__swap_duplicate: drop redundant WRITE_ONCE on swap_map for err cases

[linux-2.6-block.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index d1bd8d1e17bd3057c05f2626da00b37f11dbc866..2b3a2d85e350ba1021f627453ee62ed96478af2c 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3335,7 +3335,8 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
        } else
                err = -ENOENT;                  /* unused swap entry */
 
-       WRITE_ONCE(p->swap_map[offset], count | has_cache);
+       if (!err)
+               WRITE_ONCE(p->swap_map[offset], count | has_cache);
 
 unlock_out:
        unlock_cluster_or_swap_info(p, ci);