rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER

When assigning a NULL value to an RCU protected pointer, no barrier
is needed. The rcu_assign_pointer, used to handle that but will soon
change to not handle the special case.

Convert all rcu_assign_pointer of NULL value.

//smpl
@@ expression P; @@

- rcu_assign_pointer(P, NULL)
+ RCU_INIT_POINTER(P, NULL)

// </smpl>

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 5 deletions

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 378b20b7ca6e..065effd8349a 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -231,7 +231,7 @@ static void ipip_tunnel_unlink(struct ipip_net *ipn, struct ip_tunnel *t)
              (iter = rtnl_dereference(*tp)) != NULL;
              tp = &iter->next) {
                 if (t == iter) {
-                        rcu_assign_pointer(*tp, t->next);
+                        RCU_INIT_POINTER(*tp, t->next);
                         break;
                 }
         }
@@ -241,8 +241,8 @@ static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t)
 {
         struct ip_tunnel __rcu **tp = ipip_bucket(ipn, t);
 
-        rcu_assign_pointer(t->next, rtnl_dereference(*tp));
-        rcu_assign_pointer(*tp, t);
+        RCU_INIT_POINTER(t->next, rtnl_dereference(*tp));
+        RCU_INIT_POINTER(*tp, t);
 }
 
 static struct ip_tunnel * ipip_tunnel_locate(struct net *net,
@@ -301,7 +301,7 @@ static void ipip_tunnel_uninit(struct net_device *dev)
         struct ipip_net *ipn = net_generic(net, ipip_net_id);
 
         if (dev == ipn->fb_tunnel_dev)
-                rcu_assign_pointer(ipn->tunnels_wc[0], NULL);
+                RCU_INIT_POINTER(ipn->tunnels_wc[0], NULL);
         else
                 ipip_tunnel_unlink(ipn, netdev_priv(dev));
         dev_put(dev);
@@ -791,7 +791,7 @@ static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
                 return -ENOMEM;
 
         dev_hold(dev);
-        rcu_assign_pointer(ipn->tunnels_wc[0], tunnel);
+        RCU_INIT_POINTER(ipn->tunnels_wc[0], tunnel);
         return 0;
 }