netdev - Re: [PATCH net-2.6.25 4/7] Store the net pointer on devinet's ctl tables

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Message-Id: <20071216.133123.195336012.davem@davemloft.net>
Date:	Sun, 16 Dec 2007 13:31:23 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	xemul@...nvz.org
Cc:	netdev@...r.kernel.org, containers@...ts.osdl.org, devel@...nvz.org
Subject: Re: [PATCH net-2.6.25 4/7] Store the net pointer on devinet's ctl
 tables

From: Pavel Emelyanov <xemul@...nvz.org>
Date: Tue, 11 Dec 2007 20:53:55 +0300

> Some handers and strategies of devinet sysctl tables need
> to know the net to propagate the ctl change to all the
> net devices.
> 
> I use the (currently unused) extra2 pointer on the tables
> to get it.
> 
> Holding the reference on the struct net is not possible,
> because otherwise we'll get a net->ctl_table->net circular
> dependency. But since the ctl tables are unregistered during 
> the net destruction, this is safe to get it w/o additional 
> protection.
> 
> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org>

Applied.
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