From 1178f66eaea968d093cafd37c226ebeaa70d56cf Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 1 Nov 2009 19:51:22 +0000 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- drivers/net/pppoe.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c index 2559991eea6a..60c8d233209f 100644 --- a/drivers/net/pppoe.c +++ b/drivers/net/pppoe.c @@ -250,20 +250,19 @@ static inline struct pppox_sock *get_item_by_addr(struct net *net, { 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; } -- 2.20.1