netdev - Re: [PATCH] netns: fix net_alloc

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Message-ID: <m1liouc90h.fsf@fess.ebiederm.org>
Date:	Thu, 26 Jan 2012 15:57:18 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Miller <davem@...emloft.net>
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] netns: fix net_alloc_generic()

David Miller <davem@...emloft.net> writes:

> From: ebiederm@...ssion.com (Eric W. Biederman)
> Date: Thu, 26 Jan 2012 14:57:02 -0800
>
>> It is not a chicken and egg problem.  It is a bug in caif.
>> caif is claiming to be a network device when it is acting as a subsytem.
>> That means it is being initialized too late.
>> 
>> Untested but this should trivially fix the problem, and a bunch
>> of others of the same ilk.
>> 
>> It is not safe to shutdown subsystems until all of the devices
>> are gone, otherwise there will be problems with packets in flight.
>
> If you guys can agree that this is the better fix, and we can
> get testing showing that it works, I'll revert Eric D.'s patch
> and apply the final version of this one.

Eric D.'s change is correct, but it is just an optimization of
net_assign_generic.  Eric D.'s change is not a bug fix.

Tested fix in a moment.

Eric
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