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Commit f1a28eab authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ip6tnl: less dev_put() calls 



Using dev_get_by_index_rcu() in ip6_tnl_rcv_ctl() & ip6_tnl_xmit_ctl()
avoids touching device refcount.

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 654d1f8a

net/ipv6/ip6_tunnel.c

+5 −6
Original line number Diff line number Diff line
@@ -658,6 +658,7 @@ static void ip6ip6_dscp_ecn_decapsulate(struct ip6_tnl *t, 
		IP6_ECN_set_ce(ipv6_hdr(skb));

}



/* called with rcu_read_lock() */

static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)

{

	struct ip6_tnl_parm *p = &t->parms;
@@ -668,15 +669,13 @@ static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t) 
		struct net_device *ldev = NULL;



		if (p->link)

			ldev = dev_get_by_index(net, p->link);

			ldev = dev_get_by_index_rcu(net, p->link);



		if ((ipv6_addr_is_multicast(&p->laddr) ||

		     likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&

		    likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))

			ret = 1;



		if (ldev)

			dev_put(ldev);

	}

	return ret;

}
@@ -804,8 +803,9 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) 
	if (p->flags & IP6_TNL_F_CAP_XMIT) {

		struct net_device *ldev = NULL;



		rcu_read_lock();

		if (p->link)

			ldev = dev_get_by_index(net, p->link);

			ldev = dev_get_by_index_rcu(net, p->link);



		if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))

			printk(KERN_WARNING
@@ -819,8 +819,7 @@ static inline int ip6_tnl_xmit_ctl(struct ip6_tnl *t) 
			       p->name);

		else

			ret = 1;

		if (ldev)

			dev_put(ldev);

		rcu_read_unlock();

	}

	return ret;

}