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=-11.3 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable 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 A7525C433E1 for ; Tue, 4 Aug 2020 21:26:10 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7A19722B42 for ; Tue, 4 Aug 2020 21:26:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="T7fS5brM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A19722B42 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=roeck-us.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linux-kernel-mentees-bounces@lists.linuxfoundation.org Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 3C1E4875EE; Tue, 4 Aug 2020 21:26:10 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 83iE8ne6Iujt; Tue, 4 Aug 2020 21:26:09 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by whitealder.osuosl.org (Postfix) with ESMTP id B92208699B; Tue, 4 Aug 2020 21:26:09 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id A2D56C0050; Tue, 4 Aug 2020 21:26:09 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 9130EC004C for ; Tue, 4 Aug 2020 21:26:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 7FAC886D81 for ; Tue, 4 Aug 2020 21:26:08 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ufCra9c4S5KW for ; Tue, 4 Aug 2020 21:26:07 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-pg1-f195.google.com (mail-pg1-f195.google.com [209.85.215.195]) by whitealder.osuosl.org (Postfix) with ESMTPS id BFF908699B for ; Tue, 4 Aug 2020 21:26:07 +0000 (UTC) Received: by mail-pg1-f195.google.com with SMTP id o13so23212808pgf.0 for ; Tue, 04 Aug 2020 14:26:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=H53lbBysrvDenqcyvIC5UIxfvFKGaXbtjEmFJwaxIpE=; b=T7fS5brMmb4wsPGHicKEipC/YARUq/fZUJQbVJ+Xk4BTkzZ9GzfejLGEQPEBcZ7tAq f4tgYSeSMSqesC9fJTzH37W+mPN5bA15tpvb7fttWSh/rIQXEdSWbSK0ZHQ39DFHtaEO IdAvLeQZu3/LLvABjTqO53RvtXGps7eAuOMvzLaA9lEMfUqme0I6MfqEBbDREDWHRcYT G5if5wjnu51vBKn+XfiPXaNCo0J6Wx1Kzh63dCvaf6CThNqef/BCWLpH5UTNMPP3d2rY nmqofLZ7F4cty7/B8i/xsWuZrAUts3iHqTtgQqwkPM0E3hh0ZbWL+4COSDa6WsibYTmj lIRw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=H53lbBysrvDenqcyvIC5UIxfvFKGaXbtjEmFJwaxIpE=; b=j5098sOHIeiOAl0slE0FqzV6E5haMtE5esYo8aoTaPElNV31xBOQd1eFlDD6J9WLLq nslKYMVFJZacKhx4VEnCsGdsZCRbiDHO4nILI3pIg9F9GeslgxibpdB2/hGoYDIHVFU3 Mb1XHetJ5BblVTU8GCljVXslwGlClZ7zrMgYfYnqhm9v+pNL+8r+WYKWuoBYYKuRUM6g j8HDWIZJHfjZG3gCJfIsQOgvt33KsnqUStYoHSj/6fRY9g3BD5nGOe024d8wqlp3XqX8 1S9jv7oZSKjHLfsUxHg+q71yalCiXhsA0VsoEz9Tko1gevtC+r2WyELEsXOJM9LtKkMD F1Iw== X-Gm-Message-State: AOAM533rRxx7a9AaABXB8BC7ezrOOBU1TlRwwuscTCliC7D54gMwtMrO FlWl/9U6Kg/H78pbQVNVNNw= X-Google-Smtp-Source: ABdhPJxillOY5cbn2FINKGZ40mF2Q8aHqizsQ7EqXczJv8PwJnzXaEl1BvDabEeUkMzRY7cIaHCkGA== X-Received: by 2002:a63:1a04:: with SMTP id a4mr297213pga.95.1596576367419; Tue, 04 Aug 2020 14:26:07 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id 63sm8759439pfu.196.2020.08.04.14.26.06 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 04 Aug 2020 14:26:06 -0700 (PDT) Date: Tue, 4 Aug 2020 14:26:05 -0700 From: Guenter Roeck To: "Saheed O. Bolarinwa" Message-ID: <20200804212605.GA218592@roeck-us.net> References: <20200801112446.149549-1-refactormyself@gmail.com> <20200801112446.149549-11-refactormyself@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200801112446.149549-11-refactormyself@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) Cc: linux-hwmon@vger.kernel.org, Jean Delvare , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, helgaas@kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: Re: [Linux-kernel-mentees] [RFC PATCH 10/17] hwmon: Drop uses of pci_read_config_*() return value X-BeenThere: linux-kernel-mentees@lists.linuxfoundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-kernel-mentees-bounces@lists.linuxfoundation.org Sender: "Linux-kernel-mentees" On Sat, Aug 01, 2020 at 01:24:39PM +0200, Saheed O. Bolarinwa wrote: > The return value of pci_read_config_*() may not indicate a device error. > However, the value read by these functions is more likely to indicate > this kind of error. This presents two overlapping ways of reporting > errors and complicates error checking. > > It is possible to move to one single way of checking for error if the > dependency on the return value of these functions is removed, then it > can later be made to return void. > > Remove all uses of the return value of pci_read_config_*(). > Check the actual value read for ~0. In this case, ~0 is an invalid > value thus it indicates some kind of error. > > Suggested-by: Bjorn Helgaas > Signed-off-by: Saheed O. Bolarinwa Applied. Thanks, Guenter > --- > drivers/hwmon/i5k_amb.c | 12 ++++++++---- > drivers/hwmon/vt8231.c | 8 ++++---- > 2 files changed, 12 insertions(+), 8 deletions(-) > > diff --git a/drivers/hwmon/i5k_amb.c b/drivers/hwmon/i5k_amb.c > index eeac4b04df27..b7497510323c 100644 > --- a/drivers/hwmon/i5k_amb.c > +++ b/drivers/hwmon/i5k_amb.c > @@ -427,11 +427,13 @@ static int i5k_find_amb_registers(struct i5k_amb_data *data, > if (!pcidev) > return -ENODEV; > > - if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32)) > + pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32); > + if (val32 == (u32)~0) > goto out; > data->amb_base = val32; > > - if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32)) > + pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32); > + if (val32 == (u32)~0) > goto out; > data->amb_len = val32; > > @@ -458,11 +460,13 @@ static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id) > if (!pcidev) > return -ENODEV; > > - if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16)) > + pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16); > + if (val16 == (u16)~0) > goto out; > amb_present[0] = val16; > > - if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16)) > + pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16); > + if (val16 == (u16)~0) > goto out; > amb_present[1] = val16; > > diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c > index 2335d440f72d..6603727e15a0 100644 > --- a/drivers/hwmon/vt8231.c > +++ b/drivers/hwmon/vt8231.c > @@ -992,8 +992,8 @@ static int vt8231_pci_probe(struct pci_dev *dev, > return -ENODEV; > } > > - if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG, > - &val)) > + pci_read_config_word(dev, VT8231_BASE_REG, &val); > + if (val == (u16)~0) > return -ENODEV; > > address = val & ~(VT8231_EXTENT - 1); > @@ -1002,8 +1002,8 @@ static int vt8231_pci_probe(struct pci_dev *dev, > return -ENODEV; > } > > - if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_ENABLE_REG, > - &val)) > + pci_read_config_word(dev, VT8231_ENABLE_REG, &val); > + if (val == (u16)~0) > return -ENODEV; > > if (!(val & 0x0001)) { _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees