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From: Christoph Hellwig <hch@infradead.org>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
	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 <miquel.raynal@bootlin.com>,
	linux-rdma@vger.kernel.org, Richard Weinberger <richard@nod.at>,
	Joerg Roedel <joro@8bytes.org>,
	linux-atm-general@lists.sourceforge.net, trix@redhat.com,
	Jakub Kicinski <kuba@kernel.org>,
	linux-kernel-mentees@lists.linuxfoundation.org,
	Wolfgang Grandegger <wg@grandegger.com>,
	intel-gfx@lists.freedesktop.org, linux-gpio@vger.kernel.org,
	Borislav Petkov <bp@alien8.de>,
	skhan@linuxfoundation.org, bjorn@helgaas.com,
	Kalle Valo <kvalo@codeaurora.org>,
	linux-edac@vger.kernel.org, linux-hwmon@vger.kernel.org,
	Saheed Bolarinwa <refactormyself@gmail.com>,
	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,
	Marc Kleine-Budde <mkl@pengutronix.de>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value
Date: Mon, 3 Aug 2020 07:56:29 +0100
Message-ID: <20200803065629.GA19534@infradead.org> (raw)
In-Reply-To: <20200802191406.GA248232@bjorn-Precision-5520>

On Sun, Aug 02, 2020 at 02:14:06PM -0500, Bjorn Helgaas wrote:
> But what guarantees that a PCI config register cannot contain ~0?
> If there's something about that in the spec I'd love to know where it
> is because it would simplify a lot of things.

There isn't.  An we even have cases like the NVMe controller memory
buffer and persistent memory region, which are BARs that store
abritrary values for later retreival, so it can't.  (now those
features have a major issue with error detection, but that is another
issue)

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Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01 11:24 Saheed O. Bolarinwa
2020-08-01 11:24 ` [RFC PATCH 16/17] mtd: " Saheed O. Bolarinwa
2020-08-01 12:56 ` [RFC PATCH 00/17] " Borislav Petkov
2020-08-02 14:53   ` Tom Rix
2020-08-02 17:28   ` Saheed Bolarinwa
2020-08-02 18:46     ` Borislav Petkov
2020-08-02 19:14       ` Bjorn Helgaas
2020-08-02 20:18         ` Borislav Petkov
2020-08-03  6:56         ` Christoph Hellwig [this message]

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