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>
diff --git a/net/core/dev.c b/net/core/dev.c
index 2d01f18..a03aab4 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -772,14 +772,17 @@
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);