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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2011-05-19 19:37:40 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-05-22 21:01:20 -0400 |
| commit | 6df427fe8c481d3be437cbe8bd366bdac82b73c4 (patch) | |
| tree | 5107145d367b646f815493bfcee75e2c0abfca3b | |
| parent | ac3d3f81516fcbf80416e84682fd4bdaf3080611 (diff) | |
| download | lwn-6df427fe8c481d3be437cbe8bd366bdac82b73c4.tar.gz lwn-6df427fe8c481d3be437cbe8bd366bdac82b73c4.zip | |
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 <eric.dumazet@gmail.com>
CC: Jiri Pirko <jpirko@redhat.com>
CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/bridge/br_if.c | 1 | ||||
| -rw-r--r-- | 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); |