netdev - Re: [patch net-next-2.6] net: allow notifier subscribers to forbid device from closing

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Message-ID: <20110831082008.1c2f0c14@nehalam.ftrdhcpuser.net>
Date:	Wed, 31 Aug 2011 08:20:08 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Jiri Pirko <jpirko@...hat.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	eric.dumazet@...il.com, bhutchings@...arflare.com
Subject: Re: [patch net-next-2.6] net: allow notifier subscribers to forbid
 device from closing

On Wed, 31 Aug 2011 17:15:31 +0200
Jiri Pirko <jpirko@...hat.com> wrote:

> In some situations, like when the device is used as slave device in
> bond/br/etc it is not nice if someone closes the device. This allows
> it's masters to forbid this closure.
> 
> Signed-off-by: Jiri Pirko <jpirko@...hat.com>

I don't think this is necessary, for bridging case.
bridging handles it. And bonding should as well.
It is a good way to test STP etc.

Is this a case of "you really shouldn't do this", or
"don't do this it will crash"? In general Linux allows the
former and uses references to prevent the later.


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