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=-4.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 4FBEEC433DF for ; Sun, 2 Aug 2020 20:19:59 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 3092120738 for ; Sun, 2 Aug 2020 20:19:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="yatbPdYj"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="IpVr02DQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3092120738 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=23QdY2K/1UgACxFgaTEtOKZ5U9O3REDfMDkk0V9SAkY=; b=yatbPdYjldZpEXyJGMMXcvzv3 pSEi53TnEy5mHGrxJkvSjzf1b047nBAGxXQBfnLwmbkMVpF5L5JQm9MOlfxv/yTJ2DWxwozp5E7Yf eBvGYTt/MCNnvygY5ajHJ0t+9rKvOJ5R16yiMUGFy7SPZf09T7b9MzFJeHUb1ZS9GBNGuPPAV2FHM Xxyi9kSmBmzz9hz3/mVJxNJOdlHWcUCf2CxwqL7nu2V69FgcTmUhBXPpCGfxMWghDIY7ESNhyex8P fXzaU+ArMY5wfKnT/YOwAMh2kdwrqlvk3sAozxIZKiAdimZvIXdz4k/CszrSNmaH1ljsM62hIoj/1 kCcw5714w==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1k2KRS-0007eG-Bc; Sun, 02 Aug 2020 20:18:46 +0000 Received: from mail.skyhub.de ([5.9.137.197]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1k2KRP-0007dS-Ay for linux-mtd@lists.infradead.org; Sun, 02 Aug 2020 20:18:44 +0000 Received: from nazgul.tnic (unknown [78.130.214.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 4D2291EC02A8; Sun, 2 Aug 2020 22:18:40 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1596399520; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=z0K+vlWV9j7wfXLQcUnvdJhwiVrF38RAZueHzdmaci0=; b=IpVr02DQwE3yYwTGqHzkePquczoIuB3CSh4JRazV28rb0yxVyTjgJHeFSYXLscJQCgocj+ YjGRmfK2vuZ4xdnOu8V6Bj4srNoX1QpTQVYAD0HdeQama4rhKTHzaxEhs3BC4FYYx+fxXN dZeZiogCz7IvNzoJKsyyZMEOy76rM2w= Date: Sun, 2 Aug 2020 22:18:06 +0200 From: Borislav Petkov To: Bjorn Helgaas Subject: Re: [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value Message-ID: <20200802201806.GA24437@nazgul.tnic> References: <20200802184648.GA23190@nazgul.tnic> <20200802191406.GA248232@bjorn-Precision-5520> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200802191406.GA248232@bjorn-Precision-5520> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200802_161843_532780_5A611DE0 X-CRM114-Status: GOOD ( 13.27 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vignesh Raghavendra , linux-pci@vger.kernel.org, linux-fpga@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-ide@vger.kernel.org, linux-mtd@lists.infradead.org, linux-i2c@vger.kernel.org, Miquel Raynal , linux-rdma@vger.kernel.org, Richard Weinberger , Joerg Roedel , linux-atm-general@lists.sourceforge.net, trix@redhat.com, Jakub Kicinski , linux-kernel-mentees@lists.linuxfoundation.org, Wolfgang Grandegger , intel-gfx@lists.freedesktop.org, linux-gpio@vger.kernel.org, Marc Kleine-Budde , skhan@linuxfoundation.org, bjorn@helgaas.com, Kalle Valo , linux-edac@vger.kernel.org, linux-hwmon@vger.kernel.org, Saheed Bolarinwa , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, linux-crypto@vger.kernel.org, netdev@vger.kernel.org, dmaengine@vger.kernel.org, "David S. Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Sun, Aug 02, 2020 at 02:14:06PM -0500, Bjorn Helgaas wrote: > Wait, I'm not convinced yet. I know that if a PCI read fails, you > normally get ~0 data because the host bridge fabricates it to complete > the CPU load. > > But what guarantees that a PCI config register cannot contain ~0? Well, I don't think you can differentiate that case, right? I guess this is where the driver knowledge comes into play: if the read returns ~0, the pci_read_config* should probably return in that case something like: PCIBIOS_READ_MAYBE_FAILED to denote it is all 1s and then the caller should be able to determine, based on any of domain:bus:slot.func and whatever else the driver knows about its hardware, whether the 1s are a valid value or an error. Hopefully. Or something better of which I cannot think of right now... -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/