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

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Message-ID: <1327670668.14789.4.camel@lappy>
Date:	Fri, 27 Jan 2012 08:24:28 -0500
From:	Sasha Levin <levinsasha928@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
	xemul@...allels.com, sjur.brandeland@...ricsson.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.

On Thu, 2012-01-26 at 16:04 -0800, Eric W. Biederman wrote:
> 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> 

I've tested these two patches as well, and they also work for me.

	Tested-by: Sasha Levin <levinsasha928@...il.com>

-- 

Sasha.

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