From patchwork Wed Mar 24 09:48:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Mack X-Patchwork-Id: 12160605 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3BBBC433E0 for ; Wed, 24 Mar 2021 09:58:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B2763619F2 for ; Wed, 24 Mar 2021 09:58:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235321AbhCXJ5y (ORCPT ); Wed, 24 Mar 2021 05:57:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47162 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235296AbhCXJ5h (ORCPT ); Wed, 24 Mar 2021 05:57:37 -0400 X-Greylist: delayed 513 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Wed, 24 Mar 2021 02:57:37 PDT Received: from mail.bugwerft.de (mail.bugwerft.de [IPv6:2a03:6000:1011::59]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BF767C061763 for ; Wed, 24 Mar 2021 02:57:37 -0700 (PDT) Received: from hq-00021.holoplot.net (p57bc9f24.dip0.t-ipconnect.de [87.188.159.36]) by mail.bugwerft.de (Postfix) with ESMTPSA id E27DB4C3FA7; Wed, 24 Mar 2021 09:49:00 +0000 (UTC) From: Daniel Mack To: radhey.shyam.pandey@xilinx.com Cc: davem@davemloft.net, kuba@kernel.org, netdev@vger.kernel.org, Daniel Mack Subject: [PATCH] net: axienet: allow setups without MDIO Date: Wed, 24 Mar 2021 10:48:55 +0100 Message-Id: <20210324094855.1604778-1-daniel@zonque.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org In setups with fixed-link settings on the hardware bus there is no mdio node in DTS. axienet_probe() already handles that gracefully but lp->mii_bus is then NULL. Fix code that tries to blindly grab the MDIO lock by introducing two helper functions that make the locking conditional. Signed-off-by: Daniel Mack --- drivers/net/ethernet/xilinx/xilinx_axienet.h | 12 ++++++++++++ drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 8 ++++---- 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet.h b/drivers/net/ethernet/xilinx/xilinx_axienet.h index 1e966a39967e5..aca7f82f6791b 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet.h +++ b/drivers/net/ethernet/xilinx/xilinx_axienet.h @@ -504,6 +504,18 @@ static inline u32 axinet_ior_read_mcr(struct axienet_local *lp) return axienet_ior(lp, XAE_MDIO_MCR_OFFSET); } +static inline void axienet_lock_mii(struct axienet_local *lp) +{ + if (lp->mii_bus) + mutex_lock(&lp->mii_bus->mdio_lock); +} + +static inline void axienet_unlock_mii(struct axienet_local *lp) +{ + if (lp->mii_bus) + mutex_unlock(&lp->mii_bus->mdio_lock); +} + /** * axienet_iow - Memory mapped Axi Ethernet register write * @lp: Pointer to axienet local structure diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c index 3a8775e0ca552..ce33e0a468912 100644 --- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c +++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c @@ -1053,9 +1053,9 @@ static int axienet_open(struct net_device *ndev) * including the MDIO. MDIO must be disabled before resetting. * Hold MDIO bus lock to avoid MDIO accesses during the reset. */ - mutex_lock(&lp->mii_bus->mdio_lock); + axienet_lock_mii(lp); ret = axienet_device_reset(ndev); - mutex_unlock(&lp->mii_bus->mdio_lock); + axienet_unlock_mii(lp); ret = phylink_of_phy_connect(lp->phylink, lp->dev->of_node, 0); if (ret) { @@ -1148,9 +1148,9 @@ static int axienet_stop(struct net_device *ndev) } /* Do a reset to ensure DMA is really stopped */ - mutex_lock(&lp->mii_bus->mdio_lock); + axienet_lock_mii(lp); __axienet_device_reset(lp); - mutex_unlock(&lp->mii_bus->mdio_lock); + axienet_unlock_mii(lp); cancel_work_sync(&lp->dma_err_task);