Commit 99fe3c39 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: dev_getfirstbyhwtype() optimization 



Use RCU to avoid RTNL use in dev_getfirstbyhwtype()

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ec733b15

net/core/dev.c

+10 −7
Original line number Diff line number Diff line
@@ -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)

	rcu_read_lock();

	for_each_netdev_rcu(net, dev)

		if (dev->type == type) {

			dev_hold(dev);

	rtnl_unlock();

	return dev;

			ret = dev;

			break;

		}

	rcu_read_unlock();

	return ret;

}

EXPORT_SYMBOL(dev_getfirstbyhwtype);