netdev - Re: [PATCH net-next 3/3] bonding: add proper __rcu annotation for curr_active

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Message-ID: <20140715103858.GD28235@mikrodark.usersys.redhat.com>
Date:	Tue, 15 Jul 2014 12:38:58 +0200
From:	Veaceslav Falico <vfalico@...il.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	Nikolay Aleksandrov <nikolay@...hat.com>,
	Mahesh Bandewar <maheshb@...gle.com>
Subject: Re: [PATCH net-next 3/3] bonding: add proper __rcu annotation for
 curr_active_slave

On Tue, Jul 15, 2014 at 02:46:44AM -0700, Eric Dumazet wrote:
>RCU was added to bonding in linux-3.12 but lacked proper sparse annotations.
>
>Using __rcu annotation actually helps to spot all accesses to bond->curr_active_slave
>are correctly protected, with LOCKDEP support.
>
>Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Thanks a lot for cleaning this up, it's really a huge mess here...

One question though:

...snip...
>@@ -2046,7 +2051,7 @@ static void bond_miimon_commit(struct bonding *bond)
> 				bond_alb_handle_link_change(bond, slave,
> 							    BOND_LINK_DOWN);
>
>-			if (slave == bond->curr_active_slave)
>+			if (slave == rcu_access_pointer(bond->curr_active_slave))

I guess you've meant rtnl_dereference()? As bond_miimon_commit() is ujnder
rtnl, not under rcu.

> 				goto do_failover;
>
> 			continue;
--
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