tunnels: add _rcu annotations

[deliverable/linux.git] / net / ipv4 / gre.c

diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index caea6885fdbd0810ea3e8d9eeefd5f74282a0930..c6933f2ea3105be192c7eaa1ac06045539cd07cc 100644 (file)
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -22,7 +22,7 @@
 #include <net/gre.h>
 
 
-static const struct gre_protocol *gre_proto[GREPROTO_MAX] __read_mostly;
+static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
 static DEFINE_SPINLOCK(gre_proto_lock);
 
 int gre_add_protocol(const struct gre_protocol *proto, u8 version)
@@ -51,7 +51,8 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
                goto err_out;
 
        spin_lock(&gre_proto_lock);
-       if (gre_proto[version] != proto)
+       if (rcu_dereference_protected(gre_proto[version],
+                       lockdep_is_held(&gre_proto_lock)) != proto)
                goto err_out_unlock;
        rcu_assign_pointer(gre_proto[version], NULL);
        spin_unlock(&gre_proto_lock);