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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eric Dumazet 2009-11-04 05:43:23 -08:00 • committed by David S. Miller
commit c6d14c8456
11 changed files with 68 additions and 77 deletions
Download patch file Download diff file Expand all files Collapse all files

18
net/rose/rose_route.c
View file

@ -600,13 +600,13 @@ struct net_device *rose_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_ROSE)
if (first == NULL || strncmp(dev->name, first->name, 3) < 0)
first = dev;
}
read_unlock(&dev_base_lock);
rcu_read_unlock();
return first;
}
@ -618,8 +618,8 @@ struct net_device *rose_dev_get(rose_address *addr)
{
struct net_device *dev;
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_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0) {
dev_hold(dev);
goto out;
@ -627,7 +627,7 @@ struct net_device *rose_dev_get(rose_address *addr)
}
dev = NULL;
out:
read_unlock(&dev_base_lock);
rcu_read_unlock();
return dev;
}
@ -635,14 +635,14 @@ static int rose_dev_exists(rose_address *addr)
{
struct net_device *dev;
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_ROSE && rosecmp(addr, (rose_address *)dev->dev_addr) == 0)
goto out;
}
dev = NULL;
out:
read_unlock(&dev_base_lock);
rcu_read_unlock();
return dev != NULL;
}