rculist: Use WRITE_ONCE() when deleting from reader-visible list

[deliverable/linux.git] / include / linux / list_bl.h

diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 2eb88556c5c5b0ee0cb0fc664e9d13dc852fea6e..8132214e8efd2930ff752fcc4c37da7d23b9643f 100644 (file)
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -93,9 +93,10 @@ static inline void __hlist_bl_del(struct hlist_bl_node *n)
        LIST_BL_BUG_ON((unsigned long)n & LIST_BL_LOCKMASK);
 
        /* pprev may be `first`, so be careful not to lose the lock bit */
-       *pprev = (struct hlist_bl_node *)
+       WRITE_ONCE(*pprev,
+                  (struct hlist_bl_node *)
                        ((unsigned long)next |
-                        ((unsigned long)*pprev & LIST_BL_LOCKMASK));
+                        ((unsigned long)*pprev & LIST_BL_LOCKMASK)));
        if (next)
                next->pprev = pprev;
 }