bridge: add RCU annotations to bridge port lookup

br_port_get() renamed to br_port_get_rtnl() to make clear RTNL is held.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 8 insertions, 7 deletions

diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 427f90a8ab7b..d9d1e2bac1d6 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -475,7 +475,7 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
 {
         struct net_bridge_port *p;
 
-        p = br_port_get(dev);
+        p = br_port_get_rtnl(dev);
         if (!p || p->br != br)
                 return -EINVAL;
 
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index e3de0a428f5d..f8bf4c7f842c 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -119,7 +119,7 @@ static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
 
         idx = 0;
         for_each_netdev(net, dev) {
-                struct net_bridge_port *port = br_port_get(dev);
+                struct net_bridge_port *port = br_port_get_rtnl(dev);
 
                 /* not a bridge port */
                 if (!port || idx < cb->args[0])
@@ -171,7 +171,7 @@ static int br_rtm_setlink(struct sk_buff *skb,  struct nlmsghdr *nlh, void *arg)
         if (!dev)
                 return -ENODEV;
 
-        p = br_port_get(dev);
+        p = br_port_get_rtnl(dev);
         if (!p)
                 return -EINVAL;
 
diff --git a/net/bridge/br_notify.c b/net/bridge/br_notify.c
index ef2175c8b91d..7d337c9b6082 100644
--- a/net/bridge/br_notify.c
+++ b/net/bridge/br_notify.c
@@ -37,10 +37,10 @@ static int br_device_event(struct notifier_block *unused, unsigned long event, v
         int err;
 
         /* not a port of a bridge */
-        if (!br_port_exists(dev))
+        p = br_port_get_rtnl(dev);
+        if (!p)
                 return NOTIFY_DONE;
 
-        p = br_port_get(dev);
         br = p->br;
 
         switch (event) {
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 46e0bec1d7c5..84aac7734bfc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -159,9 +159,10 @@ static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *d
         return br_port_exists(dev) ? port : NULL;
 }
 
-static inline struct net_bridge_port *br_port_get(struct net_device *dev)
+static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 {
-        return br_port_exists(dev) ? dev->rx_handler_data : NULL;
+        return br_port_exists(dev) ?
+                rtnl_dereference(dev->rx_handler_data) : NULL;
 }
 
 struct br_cpu_netstats {