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net: Introduce for_each_netdev_rcu() iterator

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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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2009-11-04 05:43:23 -08:00
committed by David S. Miller
parent d0075634cf
commit c6d14c8456
11 changed files with 68 additions and 77 deletions
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6
net/ipv6/anycast.c
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@@ -404,13 +404,13 @@ int ipv6_chk_acast_addr(struct net *net, struct net_device *dev,
if (dev)
return ipv6_chk_acast_dev(dev, addr);
read_lock(&dev_base_lock);
for_each_netdev(net, dev)
rcu_read_lock();
for_each_netdev_rcu(net, dev)
if (ipv6_chk_acast_dev(dev, addr)) {
found = 1;
break;
}
read_unlock(&dev_base_lock);
rcu_read_unlock();
return found;
}