From 6df427fe8c481d3be437cbe8bd366bdac82b73c4 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 19 May 2011 19:37:40 +0000 Subject: [PATCH] net: remove synchronize_net() from netdev_set_master() In the old days, we used to access dev->master in __netif_receive_skb() in a rcu_read_lock section. So one synchronize_net() call was needed in netdev_set_master() to make sure another cpu could not use old master while/after we release it. We now use netdev_rx_handler infrastructure and added one synchronize_net() call in bond_release()/bond_release_all() Remove the obsolete synchronize_net() from netdev_set_master() and add one in bridge del_nbp() after its netdev_rx_handler_unregister() call. This makes enslave -d a bit faster. Signed-off-by: Eric Dumazet CC: Jiri Pirko CC: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_if.c | 1 + net/core/dev.c | 4 +--- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c index d5147ddd70bf..1bacca4cb676 100644 --- a/net/bridge/br_if.c +++ b/net/bridge/br_if.c @@ -147,6 +147,7 @@ static void del_nbp(struct net_bridge_port *p) dev->priv_flags &= ~IFF_BRIDGE_PORT; netdev_rx_handler_unregister(dev); + synchronize_net(); netdev_set_master(dev, NULL); diff --git a/net/core/dev.c b/net/core/dev.c index d94537914a71..bcb05cb799c1 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4294,10 +4294,8 @@ int netdev_set_master(struct net_device *slave, struct net_device *master) slave->master = master; - if (old) { - synchronize_net(); + if (old) dev_put(old); - } return 0; } EXPORT_SYMBOL(netdev_set_master); -- 2.20.1