netdev - Re: [net-next,1/3] bonding: fix vlan 0 addition and removal

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Date:	Tue, 06 Aug 2013 10:39:22 +0200
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Veaceslav Falico <vfalico@...hat.com>
CC:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net,
	davem@...emloft.net, kaber@...sh.net
Subject: Re: [net-next,1/3] bonding: fix vlan 0 addition and removal

> From 1c89abefebe90568ed52d2df59fcfdd650bc4696 Mon Sep 17 00:00:00 2001
> From: Veaceslav Falico <vfalico@...hat.com>
> Date: Mon, 5 Aug 2013 23:29:12 +0200
> Subject: [PATCH] bonding: add vlan_uses_dev_rcu() and make bond_vlan_used()
> use it
> 
> Currently, bond_vlan_used() looks for any vlan, including the pseudo-vlan
> id 0, and always returns true if 8021q is loaded. This creates several bad
> situations - some warnings in __bond_release_one() because it thinks that
> we still have vlans while removing, sending LB packets with vlan id 0 and,
> possibly, other caused by vlan id 0.
> 
> Fix it by adding a new call, vlan_uses_dev_rcu(), which is the same as
> vlan_uses_dev(), but uses rcu_dereference() instead of rtnl, and thus we
> can use it in bond_vlan_used() wrapped in rcu_read_lock().
> 
> Also, use the pure vlan_uses_dev() in __bond_release_one() cause the rtnl
> lock is held there.
> 
Just 1 more note, you can't trust nr_vlan_devs under RCU.
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