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, 2 insertions, 2 deletions

diff --git a/net/socket.c b/net/socket.c
index b1cbbcd92558..7ec8f9b669b3 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2463,7 +2463,7 @@ int sock_register(const struct net_proto_family *ops)
                                       lockdep_is_held(&net_family_lock)))
                 err = -EEXIST;
         else {
-                rcu_assign_pointer(net_families[ops->family], ops);
+                RCU_INIT_POINTER(net_families[ops->family], ops);
                 err = 0;
         }
         spin_unlock(&net_family_lock);
@@ -2491,7 +2491,7 @@ void sock_unregister(int family)
         BUG_ON(family < 0 || family >= NPROTO);
 
         spin_lock(&net_family_lock);
-        rcu_assign_pointer(net_families[family], NULL);
+        RCU_INIT_POINTER(net_families[family], NULL);
         spin_unlock(&net_family_lock);
 
         synchronize_rcu();