[Patch net-next v3] net: fix some RCU warnings in various places

[Cong Wang <amwang@redhat.com>]

From: Cong Wang <amwang@redhat.com>

This fixes sparse warnings like the one below:

drivers/net/team/team.c:953:25: warning: incorrect type in return expression (different address spaces)
drivers/net/team/team.c:953:25:    expected struct netpoll_info *
drivers/net/team/team.c:953:25:    got struct netpoll_info [noderef] <asn:4>*npinfo

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: Vlad Yasevich <vyasevic@redhat.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>

---
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 94c1534..71ad0f2 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1302,7 +1302,7 @@ static int bond_netpoll_setup(struct net_device *dev, struct netpoll_info *ni, g
 
 static struct netpoll_info *bond_netpoll_info(struct bonding *bond)
 {
-	return bond->dev->npinfo;
+	return rcu_access_pointer(bond->dev->npinfo);
 }
 
 #else
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 05c5efe..03e5949 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -950,7 +950,7 @@ static void team_port_disable_netpoll(struct team_port *port)
 
 static struct netpoll_info *team_netpoll_info(struct team *team)
 {
-	return team->dev->npinfo;
+	return rcu_access_pointer(team->dev->npinfo);
 }
 
 #else
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6d314c4..0aa1b84 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -330,7 +330,7 @@ extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 #ifdef CONFIG_NET_POLL_CONTROLLER
 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 {
-	return br->dev->npinfo;
+	return rcu_access_pointer(br->dev->npinfo);
 }
 
 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
@@ -469,7 +469,7 @@ extern void br_multicast_free_pg(struct rcu_head *head);
 extern struct net_bridge_port_group *br_multicast_new_port_group(
 				struct net_bridge_port *port,
 				struct br_ip *group,
-				struct net_bridge_port_group *next,
+				struct net_bridge_port_group __rcu *next,
 				unsigned char state);
 extern void br_mdb_init(void);
 extern void br_mdb_uninit(void);