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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-03-18 11:27:25 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-03-21 20:33:36 -0700 |
| commit | 99fe3c391d50d381687fd84ed0ab22d57079e41f (patch) | |
| tree | 5e7e88d73d0d96e60c3471ab4812b847a413645d | |
| parent | ec733b15a3ef0b5759141a177f8044a2f40c41e7 (diff) | |
| download | linux-3.10-99fe3c391d50d381687fd84ed0ab22d57079e41f.tar.gz linux-3.10-99fe3c391d50d381687fd84ed0ab22d57079e41f.tar.bz2 linux-3.10-99fe3c391d50d381687fd84ed0ab22d57079e41f.zip | |
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>
| -rw-r--r-- | net/core/dev.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2d01f18f303..a03aab45e84 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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); |