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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-14 04:39:27 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-14 23:13:06 -0700
commitf6bc7d9e4760324258ad5f5d147e79db8442842e (patch)
treea1f9cd28b1bf3df58b1eb30df58854fa623edc64 /net/ipv6
parent1be3b5fe9dffe3300f995584d8f996dd20e29412 (diff)
downloadop-kernel-dev-f6bc7d9e4760324258ad5f5d147e79db8442842e.zip
op-kernel-dev-f6bc7d9e4760324258ad5f5d147e79db8442842e.tar.gz
ipv6: avoid two atomics in ipv6_rthdr_rcv()
Use __in6_dev_get() instead of in6_dev_get()/in6_dev_put() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/exthdrs.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 853a633..262f105 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -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)
- accept_source_route = idev->cnf.accept_source_route;
- in6_dev_put(idev);
- }
+ idev = __in6_dev_get(skb->dev);
+ if (idev && accept_source_route > idev->cnf.accept_source_route)
+ accept_source_route = idev->cnf.accept_source_route;
if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
!pskb_may_pull(skb, (skb_transport_offset(skb) +
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