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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-07 07:54:46 +0400
committerDavid S. Miller <davem@davemloft.net>2010-06-08 08:49:51 +0400
commit6e8b11b43b0c2e901734e2cdd70c6e325a90c4ef (patch)
tree867d740b9969f749890dabaa252f78232af467b3 /net/ipv4/ip_input.c
parented7865a47d4759e85bbd7bed44bee411d868eaad (diff)
downloadlinux-6e8b11b43b0c2e901734e2cdd70c6e325a90c4ef.tar.xz
net: avoid two atomic ops in ip_rcv_options()
in_dev_get() -> __in_dev_get_rcu() in a rcu protected function. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_input.c')
-rw-r--r--net/ipv4/ip_input.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index d274078b1665..08a3b121f908 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -293,18 +293,16 @@ static inline int ip_rcv_options(struct sk_buff *skb)
}
if (unlikely(opt->srr)) {
- struct in_device *in_dev = in_dev_get(dev);
+ struct in_device *in_dev = __in_dev_get_rcu(dev);
+
if (in_dev) {
if (!IN_DEV_SOURCE_ROUTE(in_dev)) {
if (IN_DEV_LOG_MARTIANS(in_dev) &&
net_ratelimit())
printk(KERN_INFO "source route option %pI4 -> %pI4\n",
&iph->saddr, &iph->daddr);
- in_dev_put(in_dev);
goto drop;
}
-
- in_dev_put(in_dev);
}
if (ip_options_rcv_srr(skb))