From 6e8b11b43b0c2e901734e2cdd70c6e325a90c4ef Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 7 Jun 2010 03:54:46 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/ipv4/ip_input.c | 6 ++---- 1 file 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)) -- 2.20.1