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Commit 4b4194c4 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

arp: RCU change in arp_solicit() 



Avoid two atomic ops in arp_solicit()

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 59b80802

net/ipv4/arp.c

+7 −5
Original line number Diff line number Diff line
@@ -333,11 +333,14 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 
	struct net_device *dev = neigh->dev;

	__be32 target = *(__be32*)neigh->primary_key;

	int probes = atomic_read(&neigh->probes);

	struct in_device *in_dev = in_dev_get(dev);

	struct in_device *in_dev;



	if (!in_dev)

	rcu_read_lock();

	in_dev = __in_dev_get_rcu(dev);

	if (!in_dev) {

		rcu_read_unlock();

		return;



	}

	switch (IN_DEV_ARP_ANNOUNCE(in_dev)) {

	default:

	case 0:		/* By default announce any local IP */
@@ -358,9 +361,8 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb) 
	case 2:		/* Avoid secondary IPs, get a primary/preferred one */

		break;

	}

	rcu_read_unlock();



	if (in_dev)

		in_dev_put(in_dev);

	if (!saddr)

		saddr = inet_select_addr(dev, target, RT_SCOPE_LINK);