linux-kernel - Re: [Patch] net: kill an RCU warning in inet_fill_link

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Message-ID: <20101201222233.GB22009@canuck.infradead.org>
Date:	Wed, 1 Dec 2010 17:22:33 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: Re: [Patch] net: kill an RCU warning in inet_fill_link_af()

On Wed, Dec 01, 2010 at 06:31:57PM +0100, Eric Dumazet wrote:
> Are you sure RTNL is not held while dumping ? 
> 
> Patrick did the change to hold RTNL while dumping too, 3.5 years ago.
> Check commits 6313c1e0992fea, 1c2d670f3660e9103 ([RTNETLINK]: Hold
> rtnl_mutex during netlink dump callbacks)

You are right, I only looked at netlink_dump_start() where the lock
is released after setting ->cb.  We grab RTNL again in netlink_dump()
after allocating the skb.
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