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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-11-04 05:43:23 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-11-04 05:43:23 -0800 |
| commit | c6d14c84566d6b70ad9dc1618db0dec87cca9300 (patch) | |
| tree | 5ec75245cfda4d61e6b4506b6217f047ff4af01a /net/netrom | |
| parent | d0075634cf9d288988f57392a1f132d2053af961 (diff) | |
| download | lwn-c6d14c84566d6b70ad9dc1618db0dec87cca9300.tar.gz lwn-c6d14c84566d6b70ad9dc1618db0dec87cca9300.zip | |
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 <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netrom')
| -rw-r--r-- | net/netrom/nr_route.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c index 4eb1ac9a7679..aacba76070fc 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; } |