From nobody Tue Feb 10 03:37:28 2026 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 012AB1DA636 for ; Tue, 3 Dec 2024 07:22:06 +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=1733210529; cv=none; b=V5iAJcGxeOycsMCxdwnGIFlV/doPBrKX1AFwiaDdFWkvzR0w4TNyPoxNxcCO/mEzCeZIyBBA8UcNjsgh+QVqzPcJi8SXwYpUrmrAccH4hyw5xk4omBaxXeqqx56AJAkGWnUye7aV9wsnXZdiyGwKhqS8uN4vFMSUSGgoMO17m2k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733210529; c=relaxed/simple; bh=FzGdrnbxt2WjTA897Dgy/DCsuUgxXjt7QzpJZwcGPSY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=U3vlsy4e4UoT1v5VUHqgJXm5Y7SWnORYAUjT6IQ1hg8a+i2jBfy+GULtJBnhWq5M2w7qZnbz9aHRHOY7K0xjuj2rMDA6JgbR/AUaAyhFh2fc7BFz/qljy1CK8/r8vYZFGKRPoqwRw24t4AiHWQ/X0G5YKnPcRszDw7PHUmsPYTc= 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 1tINEL-0004s3-6F; Tue, 03 Dec 2024 08:21:57 +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 1tINEJ-001Qyw-0N; Tue, 03 Dec 2024 08:21:55 +0100 Received: from ore by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1tINEJ-00AEnZ-2Z; Tue, 03 Dec 2024 08:21:55 +0100 From: Oleksij Rempel To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Woojung Huh , Andrew Lunn Cc: Oleksij Rempel , kernel@pengutronix.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, UNGLinuxDriver@microchip.com, Phil Elwell Subject: [PATCH net-next v1 07/21] net: usb: lan78xx: Add error handling to lan78xx_init_ltm Date: Tue, 3 Dec 2024 08:21:40 +0100 Message-Id: <20241203072154.2440034-8-o.rempel@pengutronix.de> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241203072154.2440034-1-o.rempel@pengutronix.de> References: <20241203072154.2440034-1-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" Convert `lan78xx_init_ltm` to return error codes and handle errors properly. Previously, errors during the LTM initialization process were not propagated, potentially leading to undetected issues. This patch ensures: - Errors in `lan78xx_read_reg` and `lan78xx_write_reg` are checked and handled. - Errors are logged with detailed messages using `%pe` for clarity. - The function exits immediately on error, returning the error code. Signed-off-by: Oleksij Rempel Reviewed-by: Andrew Lunn --- drivers/net/usb/lan78xx.c | 50 ++++++++++++++++++++++++++++++--------- 1 file changed, 39 insertions(+), 11 deletions(-) diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index 29f6e1a36e20..33cda7f3dd12 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -2807,13 +2807,16 @@ static int lan78xx_vlan_rx_kill_vid(struct net_devi= ce *netdev, return 0; } =20 -static void lan78xx_init_ltm(struct lan78xx_net *dev) +static int lan78xx_init_ltm(struct lan78xx_net *dev) { + u32 regs[6] =3D { 0 }; int ret; u32 buf; - u32 regs[6] =3D { 0 }; =20 ret =3D lan78xx_read_reg(dev, USB_CFG1, &buf); + if (ret < 0) + goto init_ltm_failed; + if (buf & USB_CFG1_LTM_ENABLE_) { u8 temp[2]; /* Get values from EEPROM first */ @@ -2824,7 +2827,7 @@ static void lan78xx_init_ltm(struct lan78xx_net *dev) 24, (u8 *)regs); if (ret < 0) - return; + return ret; } } else if (lan78xx_read_otp(dev, 0x3F, 2, temp) =3D=3D 0) { if (temp[0] =3D=3D 24) { @@ -2833,17 +2836,40 @@ static void lan78xx_init_ltm(struct lan78xx_net *de= v) 24, (u8 *)regs); if (ret < 0) - return; + return ret; } } } =20 - lan78xx_write_reg(dev, LTM_BELT_IDLE0, regs[0]); - lan78xx_write_reg(dev, LTM_BELT_IDLE1, regs[1]); - lan78xx_write_reg(dev, LTM_BELT_ACT0, regs[2]); - lan78xx_write_reg(dev, LTM_BELT_ACT1, regs[3]); - lan78xx_write_reg(dev, LTM_INACTIVE0, regs[4]); - lan78xx_write_reg(dev, LTM_INACTIVE1, regs[5]); + ret =3D lan78xx_write_reg(dev, LTM_BELT_IDLE0, regs[0]); + if (ret < 0) + goto init_ltm_failed; + + ret =3D lan78xx_write_reg(dev, LTM_BELT_IDLE1, regs[1]); + if (ret < 0) + goto init_ltm_failed; + + ret =3D lan78xx_write_reg(dev, LTM_BELT_ACT0, regs[2]); + if (ret < 0) + goto init_ltm_failed; + + ret =3D lan78xx_write_reg(dev, LTM_BELT_ACT1, regs[3]); + if (ret < 0) + goto init_ltm_failed; + + ret =3D lan78xx_write_reg(dev, LTM_INACTIVE0, regs[4]); + if (ret < 0) + goto init_ltm_failed; + + ret =3D lan78xx_write_reg(dev, LTM_INACTIVE1, regs[5]); + if (ret < 0) + goto init_ltm_failed; + + return 0; + +init_ltm_failed: + netdev_err(dev->net, "Failed to init LTM with error %pe\n", ERR_PTR(ret)); + return ret; } =20 static int lan78xx_urb_config_init(struct lan78xx_net *dev) @@ -2939,7 +2965,9 @@ static int lan78xx_reset(struct lan78xx_net *dev) return ret; =20 /* Init LTM */ - lan78xx_init_ltm(dev); + ret =3D lan78xx_init_ltm(dev); + if (ret < 0) + return ret; =20 ret =3D lan78xx_write_reg(dev, BURST_CAP, dev->burst_cap); if (ret < 0) --=20 2.39.5