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>
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 84adb57..fe11f60 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -501,15 +501,16 @@
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) |
