ip6tnl: less dev_put() calls
Using dev_get_by_index_rcu() in ip6_tnl_rcv_ctl() & ip6_tnl_xmit_ctl()
avoids touching device refcount.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 6c1b5c9..1d61411 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -658,6 +658,7 @@
IP6_ECN_set_ce(ipv6_hdr(skb));
}
+/* called with rcu_read_lock() */
static inline int ip6_tnl_rcv_ctl(struct ip6_tnl *t)
{
struct ip6_tnl_parm *p = &t->parms;
@@ -668,15 +669,13 @@
struct net_device *ldev = NULL;
if (p->link)
- ldev = dev_get_by_index(net, p->link);
+ ldev = dev_get_by_index_rcu(net, p->link);
if ((ipv6_addr_is_multicast(&p->laddr) ||
likely(ipv6_chk_addr(net, &p->laddr, ldev, 0))) &&
likely(!ipv6_chk_addr(net, &p->raddr, NULL, 0)))
ret = 1;
- if (ldev)
- dev_put(ldev);
}
return ret;
}
@@ -804,8 +803,9 @@
if (p->flags & IP6_TNL_F_CAP_XMIT) {
struct net_device *ldev = NULL;
+ rcu_read_lock();
if (p->link)
- ldev = dev_get_by_index(net, p->link);
+ ldev = dev_get_by_index_rcu(net, p->link);
if (unlikely(!ipv6_chk_addr(net, &p->laddr, ldev, 0)))
printk(KERN_WARNING
@@ -819,8 +819,7 @@
p->name);
else
ret = 1;
- if (ldev)
- dev_put(ldev);
+ rcu_read_unlock();
}
return ret;
}