netdev - Re: [PATCH] bonding: move ipoib_header

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Message-Id: <20141229.232328.1289919985601274661.davem@davemloft.net>
Date:	Mon, 29 Dec 2014 23:23:28 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	wen.gang.wang@...cle.com
Cc:	netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH] bonding: move ipoib_header_ops to vmlinux

From: Wengang Wang <wen.gang.wang@...cle.com>
Date: Tue, 30 Dec 2014 11:04:42 +0800

> When last slave of a bonding master is removed, the bonding then does not work.
> At the time if packet_snd is called against with a master net_device, it calls
> then header_ops->create which points to slave's header_ops. In case the slave
> is ipoib and the module is unloaded, header_ops would point to invalid address.
> Accessing it will cause problem.
> This patch tries to fix this issue by moving ipoib_header_ops to vmlinux to keep
> it valid even when ipoib module is unloaded.
> 
> Signed-off-by: Wengang Wang <wen.gang.wang@...cle.com>

Like others, I absolutely do not consider it sustainable to keep
moving header_ops implementations into the static kernel image.

We're just papering over the real problem, which is making sure all
dangling references to something really go away when we release/unload
an object.

Point it to a dummy set of ops and do a synchronize_net() or similar.

I'm not applying this patch, sorry.
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