tree fcec7a40e0242e659474a4d9f501d9213225aa55
parent 68d8287ce1e1da3c99881385a93e74f68c454fc2
author Eric Dumazet <eric.dumazet@gmail.com> 1256886687 +0000
committer David S. Miller <davem@davemloft.net> 1257148508 -0800

net: Introduce dev_get_by_name_rcu()

Some workloads hit dev_base_lock rwlock pretty hard.
We can use RCU lookups to avoid touching this rwlock
(and avoid touching netdevice refcount)

netdevices are already freed after a RCU grace period, so this patch
adds no penalty at device dismantle time.

However, it adds a synchronize_rcu() call in dev_change_name()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>