linux-kernel - Re: [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86

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Message-ID: <627b214e6fc0624093caa8155d7006de111aacfb.camel@kernel.crashing.org>
Date:   Thu, 16 Jul 2020 08:26:40 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <helgaas@...nel.org>
Cc:     "Saheed O. Bolarinwa" <refactormyself@...il.com>,
        bjorn@...gaas.com, Shuah Khan <skhan@...uxfoundation.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Russell King <linux@...linux.org.uk>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux <sparclinux@...r.kernel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kevin Hilman <khilman@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Toan Le <toan@...amperecomputing.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Kjetil Oftedal <oftedal@...il.com>
Subject: Re: [RFC PATCH 00/35] Move all PCIBIOS* definitions into arch/x86

On Wed, 2020-07-15 at 08:47 +0200, Arnd Bergmann wrote:
> drivers/misc/cardreader/rts5261.c:      retval =
> rtsx_pci_write_config_dword(pcr, PCR_SETTING_REG2, lval);
> 
> That last one is interesting because I think this is a case in which
> we
> actually want to check for errors, as the driver seems to use it
> to ensure that accessing extended config space at offset 0x814
> works before relying on the value. Unfortunately the implementation
> seems buggy as it a) keeps using the possibly uninitialized value
> after
> printing a warning and b) returns the PCIBIOS_* value in place of a
> negative errno and then ignores it in the caller.

In cases like this, usually checking against ~0 is sufficient

Cheers,
Ben.