Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754913Ab3EUQmT (ORCPT ); Tue, 21 May 2013 12:42:19 -0400 Received: from mail-ee0-f41.google.com ([74.125.83.41]:43128 "EHLO mail-ee0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751827Ab3EUQmP (ORCPT ); Tue, 21 May 2013 12:42:15 -0400 From: Sebastian Hesselbarth To: Sebastian Hesselbarth Cc: David Miller , Lennert Buytenhek , Jason Cooper , Andrew Lunn , Benjamin Herrenschmidt , netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 01/12] net: mv643xx_eth: use phy_disconnect instead of phy_detach Date: Tue, 21 May 2013 18:41:39 +0200 Message-Id: <1369154510-4927-2-git-send-email-sebastian.hesselbarth@gmail.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1369154510-4927-1-git-send-email-sebastian.hesselbarth@gmail.com> References: <1367854420-8006-1-git-send-email-sebastian.hesselbarth@gmail.com> <1369154510-4927-1-git-send-email-sebastian.hesselbarth@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2118 Lines: 55 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 --- 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 Cc: Lennert Buytenhek Cc: Jason Cooper Cc: Andrew Lunn Cc: Benjamin Herrenschmidt Cc: netdev@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/