linux-kernel - Re: [PATCH 1/2] i2c: piix4: Use request_muxed

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Date:   Tue, 13 Feb 2018 06:11:48 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Böszörményi Zoltán <zboszor@...hu>,
        Jean Delvare <jdelvare@...e.de>
Cc:     Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c: piix4: Use request_muxed_region

On 02/13/2018 03:48 AM, Böszörményi Zoltán wrote:
> 2018-02-12 19:51 keltezéssel, Guenter Roeck írta:
>> On Mon, Feb 12, 2018 at 11:10:41AM +0100, Jean Delvare wrote:
>>> Hi Guneter,
>>>
>>> Sorry for the delay :(
>>>
>>> On Sat, 30 Dec 2017 08:50:57 -0800, Guenter Roeck wrote:
>>>> Accesses to SB800_PIIX4_SMB_IDX can occur from multiple drivers.
>>>> Use request_muxed_region() to ensure synchronization.
>>>
>>> Which ones? Documenting it, at least in the commit message, would seem
>>> useful. Out of curiosity, have these other drivers been converted to
>>> use request_muxed_region already?
>>>
>> Primarily watchdog, but there is also unprotected initialization code
>> in several locations.
> 
> There are three locations touching the same I/O ports:
> the PCI-USB quirks code (still doesn't use locking AFAIK), i2c-piix4 and
> the sp5100_tco watchdog drivers.
> 

There are a few more in arch code, though probably not all of those (or maybe none ?)
are relevant.

arch/x86/kernel/quirks.c
arch/x86/kernel/early-quirks.c
arch/x86/pci/fixup.c
arch/mips/loongson64/loongson-3/acpi_init.c
drivers/usb/host/pci-quirks.c
drivers/watchdog/sp5100_tco.[ch]
drivers/i2c/busses/i2c-piix4.c

Guenter