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From: Borislav Petkov <bp@alien8.de>
To: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
Cc: helgaas@kernel.org, Kalle Valo <kvalo@codeaurora.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Wolfgang Grandegger <wg@grandegger.com>,
	Marc Kleine-Budde <mkl@pengutronix.de>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Joerg Roedel <joro@8bytes.org>,
	bjorn@helgaas.com, skhan@linuxfoundation.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	linux-mtd@lists.infradead.org, iommu@lists.linux-foundation.org,
	linux-rdma@vger.kernel.org, linux-ide@vger.kernel.org,
	linux-i2c@vger.kernel.org, linux-hwmon@vger.kernel.org,
	dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
	linux-gpio@vger.kernel.org, linux-fpga@vger.kernel.org,
	linux-edac@vger.kernel.org, dmaengine@vger.kernel.org,
	linux-crypto@vger.kernel.org,
	linux-atm-general@lists.sourceforge.net
Subject: Re: [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value
Date: Sat, 1 Aug 2020 14:56:57 +0200
Message-ID: <20200801125657.GA25391@nazgul.tnic> (raw)
In-Reply-To: <20200801112446.149549-1-refactormyself@gmail.com>

On Sat, Aug 01, 2020 at 01:24:29PM +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.

So why isn't the *value check done in the pci_read_config_* functions
instead of touching gazillion callers?

For example, pci_conf{1,2}_read() could check whether the u32 *value it
just read depending on the access method, whether that value is ~0 and
return proper PCIBIOS_ error in that case.

The check you're replicating

	if (val32 == (u32)~0)

everywhere, instead, is just ugly and tests a naked value ~0 which
doesn't mean anything...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01 11:24 Saheed O. Bolarinwa
2020-08-01 11:24 ` [RFC PATCH 01/17] ata: " Saheed O. Bolarinwa
2020-08-01 11:24 ` [RFC PATCH 13/17] ide: " Saheed O. Bolarinwa
2020-08-01 12:56 ` Borislav Petkov [this message]
2020-08-02 14:53   ` [RFC PATCH 00/17] " 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

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