linux-kernel - Re: [PATCH 2/2] net caif: Register properly as a pernet subsystem.

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Message-Id: <20120127.210713.1525383740546787604.davem@davemloft.net>
Date:	Fri, 27 Jan 2012 21:07:13 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	eric.dumazet@...il.com, xemul@...allels.com,
	sjur.brandeland@...ricsson.com, levinsasha928@...il.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davej@...hat.com, sjurbren@...il.com
Subject: Re: [PATCH 2/2] net caif: Register properly as a pernet subsystem.

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Thu, 26 Jan 2012 16:04:53 -0800

> 
> caif is a subsystem and as such it needs to register with
> register_pernet_subsys instead of register_pernet_device.
> 
> Among other problems using register_pernet_device was resulting in
> net_generic being called before the caif_net structure was allocated.
> Which has been causing net_generic to fail with either BUG_ON's or by
> return NULL pointers.
> 
> A more ugly problem that could be caused is packets in flight why the
> subsystem is shutting down.
> 
> To remove confusion also remove the cruft cause by inappropriately
> trying to fix this bug.
> 
> With the aid of the previous patch I have tested this patch and
> confirmed that using register_pernet_subsys makes the failure go away as
> it should.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

Applied.
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