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/core/netpoll.c b/net/core/netpoll.c
index adf84dd..d676a56 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -760,7 +760,7 @@ int __netpoll_setup(struct netpoll *np)
 	}
 
 	/* last thing to do is link it to the net device structure */
-	rcu_assign_pointer(ndev->npinfo, npinfo);
+	RCU_INIT_POINTER(ndev->npinfo, npinfo);
 
 	return 0;
 
@@ -901,7 +901,7 @@ void __netpoll_cleanup(struct netpoll *np)
 		if (ops->ndo_netpoll_cleanup)
 			ops->ndo_netpoll_cleanup(np->dev);
 
-		rcu_assign_pointer(np->dev->npinfo, NULL);
+		RCU_INIT_POINTER(np->dev->npinfo, NULL);
 
 		/* avoid racing with NAPI reading npinfo */
 		synchronize_rcu_bh();