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icmp: icmp_send() can avoid a dev_put() 

We can avoid touching device refcount in icmp_send(),
using dev_get_by_index_rcu()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-11-01 19:31:03 +00:00 committed by David S. Miller
parent c148fc2e30
commit 685c794405
1 changed files with 5 additions and 4 deletions
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9
net/ipv4/icmp.c
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@ -501,15 +501,16 @@ void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info)
if (!(rt->rt_flags & RTCF_LOCAL)) {
struct net_device *dev = NULL;
rcu_read_lock();
if (rt->fl.iif &&
net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr)
dev = dev_get_by_index(net, rt->fl.iif);
dev = dev_get_by_index_rcu(net, rt->fl.iif);
if (dev) {
if (dev)
saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK);
dev_put(dev);
} else
else
saddr = 0;
rcu_read_unlock();
}
tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) |