From c6d14c84566d6b70ad9dc1618db0dec87cca9300 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 4 Nov 2009 05:43:23 -0800 Subject: net: Introduce for_each_netdev_rcu() iterator Adds RCU management to the list of netdevices. Convert some for_each_netdev() users to RCU version, if it can avoid read_lock-ing dev_base_lock Ie: read_lock(&dev_base_loack); for_each_netdev(net, dev) some_action(); read_unlock(&dev_base_lock); becomes : rcu_read_lock(); for_each_netdev_rcu(net, dev) some_action(); rcu_read_unlock(); Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/netrom/nr_route.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'net/netrom') diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c index 4eb1ac9..aacba76 100644 --- a/net/netrom/nr_route.c +++ b/net/netrom/nr_route.c @@ -597,15 +597,15 @@ struct net_device *nr_dev_first(void) { struct net_device *dev, *first = NULL; - read_lock(&dev_base_lock); - for_each_netdev(&init_net, dev) { + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM) if (first == NULL || strncmp(dev->name, first->name, 3) < 0) first = dev; } if (first) dev_hold(first); - read_unlock(&dev_base_lock); + rcu_read_unlock(); return first; } @@ -617,16 +617,17 @@ struct net_device *nr_dev_get(ax25_address *addr) { struct net_device *dev; - read_lock(&dev_base_lock); - for_each_netdev(&init_net, dev) { - if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) { + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && + ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) { dev_hold(dev); goto out; } } dev = NULL; out: - read_unlock(&dev_base_lock); + rcu_read_unlock(); return dev; } -- cgit v1.1