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Commit f6bc7d9e authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ipv6: avoid two atomics in ipv6_rthdr_rcv() 



Use __in6_dev_get() instead of in6_dev_get()/in6_dev_put()

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1be3b5fe

net/ipv6/exthdrs.c

+4 −6
Original line number Diff line number Diff line
@@ -312,6 +312,7 @@ static int ipv6_destopt_rcv(struct sk_buff *skb) 
  Routing header.

 ********************************/



/* called with rcu_read_lock() */

static int ipv6_rthdr_rcv(struct sk_buff *skb)

{

	struct inet6_skb_parm *opt = IP6CB(skb);
@@ -324,12 +325,9 @@ static int ipv6_rthdr_rcv(struct sk_buff *skb) 
	struct net *net = dev_net(skb->dev);

	int accept_source_route = net->ipv6.devconf_all->accept_source_route;



	idev = in6_dev_get(skb->dev);

	if (idev) {

		if (accept_source_route > idev->cnf.accept_source_route)

	idev = __in6_dev_get(skb->dev);

	if (idev && accept_source_route > idev->cnf.accept_source_route)

		accept_source_route = idev->cnf.accept_source_route;

		in6_dev_put(idev);

	}



	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||

	    !pskb_may_pull(skb, (skb_transport_offset(skb) +