From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 1EBE0C35641 for ; Fri, 21 Feb 2020 08:03:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E19F32467A for ; Fri, 21 Feb 2020 08:03:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582272207; bh=DF0xzH7KHrXRGTpdus/MUq9ztK8Z6G1+lyoNv4pAiRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HNt5PVzVoUuACEdOjqb7i5fEbJClIgJ9vEQ7XfnGwcpXsaWI6zNEKSbVCiIWyc6k1 PCdaifi5wkAaLmCM8W/9hZZmehxZF2a4WGhP1DixCflpjXGxuTEcBPiacrfOZqMMbm N2nyY2f7ZbpS5/G8rlqnJJpI/9RhKpenQeqw9+6w= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731465AbgBUIDZ (ORCPT ); Fri, 21 Feb 2020 03:03:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:36122 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731324AbgBUIDX (ORCPT ); Fri, 21 Feb 2020 03:03:23 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9F2962073A; Fri, 21 Feb 2020 08:03:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582272201; bh=DF0xzH7KHrXRGTpdus/MUq9ztK8Z6G1+lyoNv4pAiRA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ow9b1tj9rl/vCtct+/XBArsvhCfoTuitDnAbBoH6asmCoH8skPGuCiESQaCnxOt15 VcYeEvPoAz/I2XsE0fOAiT0RCdfIs89Vg2r05b85TE0rOroD5zvYlh8koEcRABnXPa LMClPP8pnaQkorkhM3r1Jvq7od7PCkPAqxSvK3fA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Linus Walleij , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 053/344] net: ethernet: ixp4xx: Standard module init Date: Fri, 21 Feb 2020 08:37:32 +0100 Message-Id: <20200221072353.898158155@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200221072349.335551332@linuxfoundation.org> References: <20200221072349.335551332@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Linus Walleij [ Upstream commit c83db9ef5640548631707e8b4a7bcddc115fdbae ] The IXP4xx driver was initializing the MDIO bus before even probing, in the callbacks supposed to be used for setting up the module itself, and with the side effect of trying to register the MDIO bus as soon as this module was loaded or compiled into the kernel whether the device was discovered or not. This does not work with multiplatform environments. To get rid of this: set up the MDIO bus from the probe() callback and remove it in the remove() callback. Rename the probe() and remove() calls to reflect the most common conventions. Since there is a bit of checking for the ethernet feature to be present in the MDIO registering function, making the whole module not even be registered if we can't find an MDIO bus, we need something similar: register the MDIO bus when the corresponding ethernet is probed, and return -EPROBE_DEFER on the other interfaces until this happens. If no MDIO bus is present on any of the registered interfaces we will eventually bail out. None of the platforms I've seen has e.g. MDIO on EthB and only uses EthC, there is always a Ethernet hardware on the NPE (B, C) that has the MDIO bus, we just might have to wait for it. Signed-off-by: Linus Walleij Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/xscale/ixp4xx_eth.c | 96 +++++++++++------------- 1 file changed, 44 insertions(+), 52 deletions(-) diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c index 6fc04ffb22c2a..d4e095d0e8f14 100644 --- a/drivers/net/ethernet/xscale/ixp4xx_eth.c +++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c @@ -517,25 +517,14 @@ static int ixp4xx_mdio_write(struct mii_bus *bus, int phy_id, int location, return ret; } -static int ixp4xx_mdio_register(void) +static int ixp4xx_mdio_register(struct eth_regs __iomem *regs) { int err; if (!(mdio_bus = mdiobus_alloc())) return -ENOMEM; - if (cpu_is_ixp43x()) { - /* IXP43x lacks NPE-B and uses NPE-C for MII PHY access */ - if (!(ixp4xx_read_feature_bits() & IXP4XX_FEATURE_NPEC_ETH)) - return -ENODEV; - mdio_regs = (struct eth_regs __iomem *)IXP4XX_EthC_BASE_VIRT; - } else { - /* All MII PHY accesses use NPE-B Ethernet registers */ - if (!(ixp4xx_read_feature_bits() & IXP4XX_FEATURE_NPEB_ETH0)) - return -ENODEV; - mdio_regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT; - } - + mdio_regs = regs; __raw_writel(DEFAULT_CORE_CNTRL, &mdio_regs->core_control); spin_lock_init(&mdio_lock); mdio_bus->name = "IXP4xx MII Bus"; @@ -1374,7 +1363,7 @@ static const struct net_device_ops ixp4xx_netdev_ops = { .ndo_validate_addr = eth_validate_addr, }; -static int eth_init_one(struct platform_device *pdev) +static int ixp4xx_eth_probe(struct platform_device *pdev) { struct port *port; struct net_device *dev; @@ -1384,7 +1373,7 @@ static int eth_init_one(struct platform_device *pdev) char phy_id[MII_BUS_ID_SIZE + 3]; int err; - if (!(dev = alloc_etherdev(sizeof(struct port)))) + if (!(dev = devm_alloc_etherdev(&pdev->dev, sizeof(struct port)))) return -ENOMEM; SET_NETDEV_DEV(dev, &pdev->dev); @@ -1394,20 +1383,51 @@ static int eth_init_one(struct platform_device *pdev) switch (port->id) { case IXP4XX_ETH_NPEA: + /* If the MDIO bus is not up yet, defer probe */ + if (!mdio_bus) + return -EPROBE_DEFER; port->regs = (struct eth_regs __iomem *)IXP4XX_EthA_BASE_VIRT; regs_phys = IXP4XX_EthA_BASE_PHYS; break; case IXP4XX_ETH_NPEB: + /* + * On all except IXP43x, NPE-B is used for the MDIO bus. + * If there is no NPE-B in the feature set, bail out, else + * register the MDIO bus. + */ + if (!cpu_is_ixp43x()) { + if (!(ixp4xx_read_feature_bits() & + IXP4XX_FEATURE_NPEB_ETH0)) + return -ENODEV; + /* Else register the MDIO bus on NPE-B */ + if ((err = ixp4xx_mdio_register(IXP4XX_EthC_BASE_VIRT))) + return err; + } + if (!mdio_bus) + return -EPROBE_DEFER; port->regs = (struct eth_regs __iomem *)IXP4XX_EthB_BASE_VIRT; regs_phys = IXP4XX_EthB_BASE_PHYS; break; case IXP4XX_ETH_NPEC: + /* + * IXP43x lacks NPE-B and uses NPE-C for the MDIO bus access, + * of there is no NPE-C, no bus, nothing works, so bail out. + */ + if (cpu_is_ixp43x()) { + if (!(ixp4xx_read_feature_bits() & + IXP4XX_FEATURE_NPEC_ETH)) + return -ENODEV; + /* Else register the MDIO bus on NPE-C */ + if ((err = ixp4xx_mdio_register(IXP4XX_EthC_BASE_VIRT))) + return err; + } + if (!mdio_bus) + return -EPROBE_DEFER; port->regs = (struct eth_regs __iomem *)IXP4XX_EthC_BASE_VIRT; regs_phys = IXP4XX_EthC_BASE_PHYS; break; default: - err = -ENODEV; - goto err_free; + return -ENODEV; } dev->netdev_ops = &ixp4xx_netdev_ops; @@ -1416,10 +1436,8 @@ static int eth_init_one(struct platform_device *pdev) netif_napi_add(dev, &port->napi, eth_poll, NAPI_WEIGHT); - if (!(port->npe = npe_request(NPE_ID(port->id)))) { - err = -EIO; - goto err_free; - } + if (!(port->npe = npe_request(NPE_ID(port->id)))) + return -EIO; port->mem_res = request_mem_region(regs_phys, REGS_SIZE, dev->name); if (!port->mem_res) { @@ -1465,12 +1483,10 @@ err_free_mem: release_resource(port->mem_res); err_npe_rel: npe_release(port->npe); -err_free: - free_netdev(dev); return err; } -static int eth_remove_one(struct platform_device *pdev) +static int ixp4xx_eth_remove(struct platform_device *pdev) { struct net_device *dev = platform_get_drvdata(pdev); struct phy_device *phydev = dev->phydev; @@ -1478,45 +1494,21 @@ static int eth_remove_one(struct platform_device *pdev) unregister_netdev(dev); phy_disconnect(phydev); + ixp4xx_mdio_remove(); npe_port_tab[NPE_ID(port->id)] = NULL; npe_release(port->npe); release_resource(port->mem_res); - free_netdev(dev); return 0; } static struct platform_driver ixp4xx_eth_driver = { .driver.name = DRV_NAME, - .probe = eth_init_one, - .remove = eth_remove_one, + .probe = ixp4xx_eth_probe, + .remove = ixp4xx_eth_remove, }; - -static int __init eth_init_module(void) -{ - int err; - - /* - * FIXME: we bail out on device tree boot but this really needs - * to be fixed in a nicer way: this registers the MDIO bus before - * even matching the driver infrastructure, we should only probe - * detected hardware. - */ - if (of_have_populated_dt()) - return -ENODEV; - if ((err = ixp4xx_mdio_register())) - return err; - return platform_driver_register(&ixp4xx_eth_driver); -} - -static void __exit eth_cleanup_module(void) -{ - platform_driver_unregister(&ixp4xx_eth_driver); - ixp4xx_mdio_remove(); -} +module_platform_driver(ixp4xx_eth_driver); MODULE_AUTHOR("Krzysztof Halasa"); MODULE_DESCRIPTION("Intel IXP4xx Ethernet driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:ixp4xx_eth"); -module_init(eth_init_module); -module_exit(eth_cleanup_module); -- 2.20.1