Re: [PATCH net] ipv6: addrconf: Avoid calling netdevice notifiers with RCU read-side lock

From: Ben Hutchings <redacted>
Date: Tue, 14 Aug 2012 19:54:51 +0100

Cong Wang reports that lockdep detected suspicious RCU usage while
enabling IPV6 forwarding:

 ...

addrconf_forward_change() uses RCU iteration over the netdev list,
which is unnecessary since it already holds the RTNL lock.  We also
cannot reasonably require netdevice notifier functions not to sleep.

Reported-by: Cong Wang <redacted>
Signed-off-by: Ben Hutchings <redacted>

Applied and queued up for -stable, thanks Ben.