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>

6 files changed, 10 insertions, 10 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index 17d67b579beb..9428766d0140 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3094,8 +3094,8 @@ void netdev_rx_handler_unregister(struct net_device *dev)
 {
 
 	ASSERT_RTNL();
-	rcu_assign_pointer(dev->rx_handler, NULL);
-	rcu_assign_pointer(dev->rx_handler_data, NULL);
+	RCU_INIT_POINTER(dev->rx_handler, NULL);
+	RCU_INIT_POINTER(dev->rx_handler_data, NULL);
 }
 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
 
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index e7ab0c0285b5..0657b57df558 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -487,7 +487,7 @@ static int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
 		if (ops->nr_goto_rules > 0) {
 			list_for_each_entry(tmp, &ops->rules_list, list) {
 				if (rtnl_dereference(tmp->ctarget) == rule) {
-					rcu_assign_pointer(tmp->ctarget, NULL);
+					RCU_INIT_POINTER(tmp->ctarget, NULL);
 					ops->unresolved_rules++;
 				}
 			}
diff --git a/net/core/filter.c b/net/core/filter.c
index 36f975fa87cb..8fcc2d776e09 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -645,7 +645,7 @@ int sk_detach_filter(struct sock *sk)
 	filter = rcu_dereference_protected(sk->sk_filter,
 					   sock_owned_by_user(sk));
 	if (filter) {
-		rcu_assign_pointer(sk->sk_filter, NULL);
+		RCU_INIT_POINTER(sk->sk_filter, NULL);
 		sk_filter_uncharge(sk, filter);
 		ret = 0;
 	}
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 1683e5db2f27..b1ab887520a8 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -987,10 +987,10 @@ static ssize_t store_xps_map(struct netdev_queue *queue,
 	}
 
 	if (nonempty)
-		rcu_assign_pointer(dev->xps_maps, new_dev_maps);
+		RCU_INIT_POINTER(dev->xps_maps, new_dev_maps);
 	else {
 		kfree(new_dev_maps);
-		rcu_assign_pointer(dev->xps_maps, NULL);
+		RCU_INIT_POINTER(dev->xps_maps, NULL);
 	}
 
 	if (dev_maps)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index adf84dd8c7b5..d676a561d983 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();
diff --git a/net/core/sock.c b/net/core/sock.c
index bc745d00ea4d..9997026b44b2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -387,7 +387,7 @@ struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
 
 	if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
 		sk_tx_queue_clear(sk);
-		rcu_assign_pointer(sk->sk_dst_cache, NULL);
+		RCU_INIT_POINTER(sk->sk_dst_cache, NULL);
 		dst_release(dst);
 		return NULL;
 	}
@@ -1158,7 +1158,7 @@ static void __sk_free(struct sock *sk)
 				       atomic_read(&sk->sk_wmem_alloc) == 0);
 	if (filter) {
 		sk_filter_uncharge(sk, filter);
-		rcu_assign_pointer(sk->sk_filter, NULL);
+		RCU_INIT_POINTER(sk->sk_filter, NULL);
 	}
 
 	sock_disable_timestamp(sk, SOCK_TIMESTAMP);