netdev - Re: [PATCH v4] bridge: fix bridge netlink RCU usage

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Message-Id: <20150304.002044.1989204876340561150.davem@davemloft.net>
Date:	Wed, 04 Mar 2015 00:20:44 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	johannes@...solutions.net
Cc:	netdev@...r.kernel.org, roopa@...ulusnetworks.com,
	stephen@...workplumber.org, johannes.berg@...el.com
Subject: Re: [PATCH v4] bridge: fix bridge netlink RCU usage

From: Johannes Berg <johannes@...solutions.net>
Date: Tue,  3 Mar 2015 16:02:16 +0100

> From: Johannes Berg <johannes.berg@...el.com>
> 
> When the STP timer fires, it can call br_ifinfo_notify(),
> which in turn ends up in the new br_get_link_af_size().
> This function is annotated to be using RTNL locking, which
> clearly isn't the case here, and thus lockdep warns:
> 
>   ===============================
>   [ INFO: suspicious RCU usage. ]
>   3.19.0+ #569 Not tainted
>   -------------------------------
>   net/bridge/br_private.h:204 suspicious rcu_dereference_protected() usage!
> 
> Fix this by doing RCU locking here.
> 
> Fixes: b7853d73e39b ("bridge: add vlan info to bridge setlink and dellink notification messages")
> Signed-off-by: Johannes Berg <johannes.berg@...el.com>

Applied to net-next, thanks Johannes.
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