pppoe: RCU locking in get_item_by_addr()
Use dev_get_by_name_rcu() instead of dev_get_by_name(),
to avoid touching device refcount in hotpath.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 2559991..60c8d23 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -250,20 +250,19 @@
{
struct net_device *dev;
struct pppoe_net *pn;
- struct pppox_sock *pppox_sock;
+ struct pppox_sock *pppox_sock = NULL;
int ifindex;
- dev = dev_get_by_name(net, sp->sa_addr.pppoe.dev);
- if (!dev)
- return NULL;
-
- ifindex = dev->ifindex;
- pn = net_generic(net, pppoe_net_id);
- pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
+ rcu_read_lock();
+ dev = dev_get_by_name_rcu(net, sp->sa_addr.pppoe.dev);
+ if (dev) {
+ ifindex = dev->ifindex;
+ pn = net_generic(net, pppoe_net_id);
+ pppox_sock = get_item(pn, sp->sa_addr.pppoe.sid,
sp->sa_addr.pppoe.remote, ifindex);
- dev_put(dev);
-
+ }
+ rcu_read_unlock();
return pppox_sock;
}