netdev - Re: [net-next-2.6 PATCH] bonding: refuse to change bond type if it's used

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Message-Id: <20100308.121632.232613075.davem@davemloft.net>
Date:	Mon, 08 Mar 2010 12:16:32 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...ux-foundation.org
Cc:	jpirko@...hat.com, netdev@...r.kernel.org, fubar@...ibm.com,
	bonding-devel@...ts.sourceforge.net
Subject: Re: [net-next-2.6 PATCH] bonding: refuse to change bond type if
 it's used

From: Stephen Hemminger <shemminger@...ux-foundation.org>
Date: Mon, 8 Mar 2010 10:24:48 -0800

> On Mon, 8 Mar 2010 18:54:06 +0100
> Jiri Pirko <jpirko@...hat.com> wrote:
> 
>> It's not desirable to be able to change the type of net_device in bond device if
>> it's in use by bridge, or vlan, or so. At the moment, there is possible for
>> example to have INFINIBAND bond type in bridge (by adding bond with eth type to
>> a bridge first and then enslave INFINIBAND device).
> 
> Rather than building lots of back pointer dependencies, why not
> have another netdevice notifier that allows other subsystems to
> see the type change and reject it if they care? That way the code
> would be more modular and expandable.

Agreed.
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