linux-kernel - Re: [PATCH v5 01/13] net: mv643xx_eth: use phy_disconnect instead of phy

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Message-ID: <20130529200053.GA31290@titan.lakedaemon.net>
Date:	Wed, 29 May 2013 16:00:53 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Andrew Lunn <andrew@...n.ch>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/13] net: mv643xx_eth: use phy_disconnect instead
 of phy_detach

Sebastian,

On Wed, May 29, 2013 at 09:32:43PM +0200, Sebastian Hesselbarth wrote:
> Using a separated mdio bus driver with mvmdio, phy_detach on network device
> removal will not stop the phy and finally lead to NULL pointer dereference
> in mvmdio due to non-existent network device. Use phy_disconnect instead
> to properly stop phy device from accessing network device prior removal of
> the network device.
> 
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> ---
> Note: I observed this behavior when removing a modular mv643xx_eth driver
> after attaching it to a phy handled by (also modular) mvmdio. The mvmdio
> conversion has been done in
> 
> commit c3a07134e6aa5b93a37f72ffa3d11fadf72bf757
>  ("mv643xx_eth: convert to use the Marvell Orion MDIO driver")
> 
> and should go back any -stable version with that commit (propably only 3.9)

It looks like just v3.10-rcX, here.

thx,

Jason.
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