linux-kernel - Re: [PATCH 1/2] netns: Fail conspicously if someone uses net

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Message-Id: <20120127.210706.1819458801435039273.davem@davemloft.net>
Date:	Fri, 27 Jan 2012 21:07:06 -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 1/2] netns: Fail conspicously if someone uses
 net_generic at an inappropriate time.

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Thu, 26 Jan 2012 16:02:55 -0800

> By definition net_generic should never be called when it can return
> NULL.  Fail conspicously with a BUG_ON to make it clear when people mess
> up that a NULL return should never happen.
> 
> Recently there was a bug in the CAIF subsystem where it was registered
> with register_pernet_device instead of register_pernet_subsys.  It was
> erroneously concluded that net_generic could validly return NULL and
> that net_assign_generic was buggy (when it was just inefficient).
> Hopefully this BUG_ON will prevent people to coming to similar erroneous
> conclusions in the futrue.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>

Applied.
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