From nobody Wed Dec 17 09:18:12 2025 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [185.203.201.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1635C2512EA for ; Wed, 19 Mar 2025 08:50:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.203.201.7 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742374206; cv=none; b=MohM7OWdac6VmaTdql+xLiHwK6/U1VDWs5cbiPiL+BdU5dFCfNugPjaLBhy/tyol8hf84Bpa1892SEL2hEgafUfKbRBhXs7CxjRe1oHul0oA4rxeUBLsWsLRd5pFXj7PaJFgnHfCB1//u69QJd56BPC+KRXTq7Oa32X6ZhD9BZQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742374206; c=relaxed/simple; bh=2b6GGhEehb1gFYftj//oFq4u7mgh7KLf3gsCVxZr+9w=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IklfFfI39dj0oKDc6OtW8ZtaDQQY1uZXoF4uKA1UruQOsc/7hg3hYxy1QFqGiSrYQ+/KwtOmngyr+pMjz3mKxX4D83j8eFtPBpqj64Nmb6Fb7GrDa35aHuWs3f1UnV+2U3FKiTqKIw6glATkfIk7MWVhHo9YSErbncZYH2xwGeQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de; spf=pass smtp.mailfrom=pengutronix.de; arc=none smtp.client-ip=185.203.201.7 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=pengutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pengutronix.de Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tup7b-0008Or-V6; Wed, 19 Mar 2025 09:49:55 +0100 Received: from dude04.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::ac]) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tup7Z-000Z4N-0X; Wed, 19 Mar 2025 09:49:53 +0100 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1tup7Z-001l1Y-1d; Wed, 19 Mar 2025 09:49:53 +0100 From: Oleksij Rempel To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Woojung Huh , Andrew Lunn , Russell King , Thangaraj Samynathan , Rengarajan Sundararajan Cc: Oleksij Rempel , kernel@pengutronix.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, UNGLinuxDriver@microchip.com, Phil Elwell , Maxime Chevallier , Simon Horman Subject: [PATCH net-next v5 1/6] net: usb: lan78xx: Improve error handling in PHY initialization Date: Wed, 19 Mar 2025 09:49:47 +0100 Message-Id: <20250319084952.419051-2-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250319084952.419051-1-o.rempel@pengutronix.de> References: <20250319084952.419051-1-o.rempel@pengutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ore@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Ensure that return values from `lan78xx_write_reg()`, `lan78xx_read_reg()`, and `phy_find_first()` are properly checked and propagated. Use `ERR_PTR(ret)` for error reporting in `lan7801_phy_init()` and replace `-EIO` with `-ENODEV` where appropriate to provide more accurate error codes. Signed-off-by: Oleksij Rempel --- changes v5: - make sure lan7801_phy_init() caller is testing against IS_ERR instead of NULL. changes v4: - split the patch and move part of it before PHYlink migration --- drivers/net/usb/lan78xx.c | 47 ++++++++++++++++++++++++++------------- 1 file changed, 31 insertions(+), 16 deletions(-) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 137adf6d5b08..13b5da18850a 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -2510,14 +2510,13 @@ static void lan78xx_remove_irq_domain(struct lan78x= x_net *dev) =20 static struct phy_device *lan7801_phy_init(struct lan78xx_net *dev) { - u32 buf; - int ret; struct fixed_phy_status fphy_status =3D { .link =3D 1, .speed =3D SPEED_1000, .duplex =3D DUPLEX_FULL, }; struct phy_device *phydev; + int ret; =20 phydev =3D phy_find_first(dev->mdiobus); if (!phydev) { @@ -2525,30 +2524,40 @@ static struct phy_device *lan7801_phy_init(struct l= an78xx_net *dev) phydev =3D fixed_phy_register(PHY_POLL, &fphy_status, NULL); if (IS_ERR(phydev)) { netdev_err(dev->net, "No PHY/fixed_PHY found\n"); - return NULL; + return ERR_PTR(-ENODEV); } netdev_dbg(dev->net, "Registered FIXED PHY\n"); dev->interface =3D PHY_INTERFACE_MODE_RGMII; ret =3D lan78xx_write_reg(dev, MAC_RGMII_ID, MAC_RGMII_ID_TXC_DELAY_EN_); + if (ret < 0) + return ERR_PTR(ret); + ret =3D lan78xx_write_reg(dev, RGMII_TX_BYP_DLL, 0x3D00); - ret =3D lan78xx_read_reg(dev, HW_CFG, &buf); - buf |=3D HW_CFG_CLK125_EN_; - buf |=3D HW_CFG_REFCLK25_EN_; - ret =3D lan78xx_write_reg(dev, HW_CFG, buf); + if (ret < 0) + return ERR_PTR(ret); + + ret =3D lan78xx_update_reg(dev, HW_CFG, HW_CFG_CLK125_EN_ | + HW_CFG_REFCLK25_EN_, + HW_CFG_CLK125_EN_ | HW_CFG_REFCLK25_EN_); + if (ret < 0) + return ERR_PTR(ret); } else { if (!phydev->drv) { netdev_err(dev->net, "no PHY driver found\n"); - return NULL; + return ERR_PTR(-EINVAL); } dev->interface =3D PHY_INTERFACE_MODE_RGMII_ID; /* The PHY driver is responsible to configure proper RGMII * interface delays. Disable RGMII delays on MAC side. */ - lan78xx_write_reg(dev, MAC_RGMII_ID, 0); + ret =3D lan78xx_write_reg(dev, MAC_RGMII_ID, 0); + if (ret < 0) + return ERR_PTR(ret); =20 phydev->is_internal =3D false; } + return phydev; } =20 @@ -2562,9 +2571,10 @@ static int lan78xx_phy_init(struct lan78xx_net *dev) switch (dev->chipid) { case ID_REV_CHIP_ID_7801_: phydev =3D lan7801_phy_init(dev); - if (!phydev) { - netdev_err(dev->net, "lan7801: PHY Init Failed"); - return -EIO; + if (IS_ERR(phydev)) { + netdev_err(dev->net, "lan7801: failed to init PHY: %pe\n", + phydev); + return PTR_ERR(phydev); } break; =20 @@ -2573,7 +2583,7 @@ static int lan78xx_phy_init(struct lan78xx_net *dev) phydev =3D phy_find_first(dev->mdiobus); if (!phydev) { netdev_err(dev->net, "no PHY found\n"); - return -EIO; + return -ENODEV; } phydev->is_internal =3D true; dev->interface =3D PHY_INTERFACE_MODE_GMII; @@ -2581,7 +2591,7 @@ static int lan78xx_phy_init(struct lan78xx_net *dev) =20 default: netdev_err(dev->net, "Unknown CHIP ID found\n"); - return -EIO; + return -ENODEV; } =20 /* if phyirq is not set, use polling mode in phylib */ @@ -2633,7 +2643,10 @@ static int lan78xx_phy_init(struct lan78xx_net *dev) sizeof(u32)); if (len >=3D 0) { /* Ensure the appropriate LEDs are enabled */ - lan78xx_read_reg(dev, HW_CFG, ®); + ret =3D lan78xx_read_reg(dev, HW_CFG, ®); + if (ret < 0) + return ret; + reg &=3D ~(HW_CFG_LED0_EN_ | HW_CFG_LED1_EN_ | HW_CFG_LED2_EN_ | @@ -2642,7 +2655,9 @@ static int lan78xx_phy_init(struct lan78xx_net *dev) (len > 1) * HW_CFG_LED1_EN_ | (len > 2) * HW_CFG_LED2_EN_ | (len > 3) * HW_CFG_LED3_EN_; - lan78xx_write_reg(dev, HW_CFG, reg); + ret =3D lan78xx_write_reg(dev, HW_CFG, reg); + if (ret < 0) + return ret; } } =20 --=20 2.39.5