diff --git a/mm/swapfile.c b/mm/swapfile.c
index 1551fb89769f..b7e1620adee6 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -673,6 +673,7 @@ static void __del_from_avail_list(struct swap_info_struct *p)
 {
 	int nid;
 
+	assert_spin_locked(&p->lock);
 	for_each_node(nid)
 		plist_del(&p->avail_lists[nid], &swap_avail_heads[nid]);
 }
@@ -2565,8 +2566,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
 		spin_unlock(&swap_lock);
 		goto out_dput;
 	}
-	del_from_avail_list(p);
 	spin_lock(&p->lock);
+	del_from_avail_list(p);
 	if (p->prio < 0) {
 		struct swap_info_struct *si = p;
 		int nid;