From patchwork Thu Nov 21 19:15:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ioana Ciornei X-Patchwork-Id: 1199108 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=nxp.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47Jq5z50tDz9sPc for ; Fri, 22 Nov 2019 06:15:51 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726880AbfKUTPu (ORCPT ); Thu, 21 Nov 2019 14:15:50 -0500 Received: from inva021.nxp.com ([92.121.34.21]:59726 "EHLO inva021.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726541AbfKUTPu (ORCPT ); Thu, 21 Nov 2019 14:15:50 -0500 Received: from inva021.nxp.com (localhost [127.0.0.1]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 58C4D20062C; Thu, 21 Nov 2019 20:15:48 +0100 (CET) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva021.eu-rdc02.nxp.com (Postfix) with ESMTP id 499FC20062B; Thu, 21 Nov 2019 20:15:48 +0100 (CET) Received: from fsr-ub1464-137.ea.freescale.net (fsr-ub1464-137.ea.freescale.net [10.171.82.114]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 13FFF203C8; Thu, 21 Nov 2019 20:15:48 +0100 (CET) From: Ioana Ciornei To: davem@davemloft.net, netdev@vger.kernel.org Cc: linux@armlinux.org.uk, andrew@lunn.ch, Ioana Ciornei Subject: [PATCH net-next 1/3] dpaa2-eth: do not hold rtnl_lock on phylink_create() or _destroy() Date: Thu, 21 Nov 2019 21:15:25 +0200 Message-Id: <1574363727-5437-2-git-send-email-ioana.ciornei@nxp.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1574363727-5437-1-git-send-email-ioana.ciornei@nxp.com> References: <1574363727-5437-1-git-send-email-ioana.ciornei@nxp.com> Reply-to: ioana.ciornei@nxp.com X-Virus-Scanned: ClamAV using ClamSMTP Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The rtnl_lock should not be held when calling phylink_create() or phylink_destroy() since it leads to the deadlock listed below: [ 18.656576] rtnl_lock+0x18/0x20 [ 18.659798] sfp_bus_add_upstream+0x28/0x90 [ 18.663974] phylink_create+0x2cc/0x828 [ 18.667803] dpaa2_mac_connect+0x14c/0x2a8 [ 18.671890] dpaa2_eth_connect_mac+0x94/0xd8 Fix this by moving the _lock() and _unlock() calls just outside of phylink_of_phy_connect() and phylink_disconnect_phy(). Fixes: 719479230893 ("dpaa2-eth: add MAC/PHY support through phylink") Reported-by: Russell King Signed-off-by: Ioana Ciornei --- drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 4 ---- drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 4 ++++ 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c index 7ff147e89426..40290fea9e36 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -3431,12 +3431,10 @@ static irqreturn_t dpni_irq0_handler_thread(int irq_num, void *arg) set_mac_addr(netdev_priv(net_dev)); update_tx_fqids(priv); - rtnl_lock(); if (priv->mac) dpaa2_eth_disconnect_mac(priv); else dpaa2_eth_connect_mac(priv); - rtnl_unlock(); } return IRQ_HANDLED; @@ -3675,9 +3673,7 @@ static int dpaa2_eth_remove(struct fsl_mc_device *ls_dev) #ifdef CONFIG_DEBUG_FS dpaa2_dbg_remove(priv); #endif - rtnl_lock(); dpaa2_eth_disconnect_mac(priv); - rtnl_unlock(); unregister_netdev(net_dev); diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c index 84233e467ed1..0200308d1bc7 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c @@ -277,7 +277,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac) } mac->phylink = phylink; + rtnl_lock(); err = phylink_of_phy_connect(mac->phylink, dpmac_node, 0); + rtnl_unlock(); if (err) { netdev_err(net_dev, "phylink_of_phy_connect() = %d\n", err); goto err_phylink_destroy; @@ -301,7 +303,9 @@ void dpaa2_mac_disconnect(struct dpaa2_mac *mac) if (!mac->phylink) return; + rtnl_lock(); phylink_disconnect_phy(mac->phylink); + rtnl_unlock(); phylink_destroy(mac->phylink); dpmac_close(mac->mc_io, 0, mac->mc_dev->mc_handle); }