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net: dev_getfirstbyhwtype() optimization 

Use RCU to avoid RTNL use in dev_getfirstbyhwtype()

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 2010-03-18 11:27:25 +00:00 committed by David S. Miller
parent ec733b15a3
commit 99fe3c391d
1 changed files with 10 additions and 7 deletions
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17
net/core/dev.c
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@ -772,14 +772,17 @@ EXPORT_SYMBOL(__dev_getfirstbyhwtype);
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
{
struct net_device *dev;
struct net_device *dev, *ret = NULL;
rtnl_lock();
dev = __dev_getfirstbyhwtype(net, type);
if (dev)
dev_hold(dev);
rtnl_unlock();
return dev;
rcu_read_lock();
for_each_netdev_rcu(net, dev)
if (dev->type == type) {
dev_hold(dev);
ret = dev;
break;
}
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);