netdev - [PATCH v4 01/12] net: mv643xx_eth: use phy_disconnect instead of phy

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Message-Id: <1369154510-4927-2-git-send-email-sebastian.hesselbarth@gmail.com>
Date:	Tue, 21 May 2013 18:41:39 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Lennert Buytenhek <buytenh@...tstofly.org>,
	Jason Cooper <jason@...edaemon.net>,
	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: [PATCH v4 01/12] net: mv643xx_eth: use phy_disconnect instead of phy_detach

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)

@David: I am not sure if the above description is sufficient for a -stable
patch, if you need more, like actual kernel failure, I am sure I can reproduce
it.

Cc: David Miller <davem@...emloft.net>
Cc: Lennert Buytenhek <buytenh@...tstofly.org>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: netdev@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/marvell/mv643xx_eth.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index d0afeea..ef3454c 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -2805,7 +2805,7 @@ static int mv643xx_eth_remove(struct platform_device *pdev)
 
 	unregister_netdev(mp->dev);
 	if (mp->phy != NULL)
-		phy_detach(mp->phy);
+		phy_disconnect(mp->phy);
 	cancel_work_sync(&mp->tx_timeout_task);
 
 	if (!IS_ERR(mp->clk))
-- 
1.7.10.4

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