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/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 6fb1fb3624bf..694d70a8a0ee 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -218,8 +218,8 @@ ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
 {
         struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
 
-        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);
 }
 
 /**
@@ -237,7 +237,7 @@ ip6_tnl_unlink(struct ip6_tnl_net *ip6n, struct ip6_tnl *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;
                 }
         }
@@ -350,7 +350,7 @@ ip6_tnl_dev_uninit(struct net_device *dev)
         struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
 
         if (dev == ip6n->fb_tnl_dev)
-                rcu_assign_pointer(ip6n->tnls_wc[0], NULL);
+                RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
         else
                 ip6_tnl_unlink(ip6n, t);
         ip6_tnl_dst_reset(t);
@@ -1440,7 +1440,7 @@ static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
 
         t->parms.proto = IPPROTO_IPV6;
         dev_hold(dev);
-        rcu_assign_pointer(ip6n->tnls_wc[0], t);
+        RCU_INIT_POINTER(ip6n->tnls_wc[0], t);
         return 0;
 }