mm/swap: remove unneeded p != NULL check in __swap_duplicate

If p is NULL, __swap_duplicate will already return -EINVAL.  So if we
reach here, p must be non-NULL.

Link: https://lkml.kernel.org/r/20220509131416.17553-8-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index f59abca..e67adda 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3333,8 +3333,7 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
 
 unlock_out:
        unlock_cluster_or_swap_info(p, ci);
-       if (p)
-               put_swap_device(p);
+       put_swap_device(p);
        return err;
 }