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/can/af_can.c b/net/can/af_can.c
index 8ce926d3b2cb..b9efa944cab9 100644
--- a/net/can/af_can.c
+++ b/net/can/af_can.c
@@ -719,7 +719,7 @@ int can_proto_register(const struct can_proto *cp)
                        proto);
                 err = -EBUSY;
         } else
-                rcu_assign_pointer(proto_tab[proto], cp);
+                RCU_INIT_POINTER(proto_tab[proto], cp);
 
         mutex_unlock(&proto_tab_lock);
 
@@ -740,7 +740,7 @@ void can_proto_unregister(const struct can_proto *cp)
 
         mutex_lock(&proto_tab_lock);
         BUG_ON(proto_tab[proto] != cp);
-        rcu_assign_pointer(proto_tab[proto], NULL);
+        RCU_INIT_POINTER(proto_tab[proto], NULL);
         mutex_unlock(&proto_tab_lock);
 
         synchronize_rcu();