linux-kernel - Re: [PATCH] kernel/resource.c: fix muxed resource handling in __request

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Date:	Tue, 23 Feb 2016 09:00:24 +0100
From:	Vincent Pelletier <plr.vincent@...il.com>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Simon Guinot <simon.guinot@...uanux.org>,
	Giel van Schijndel <me@...tis.eu>,
	linux-gpio@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Vincent Donnefort <vdonnefort@...il.com>,
	Yoann Sculo <yoann@...lo.fr>
Subject: Re: [PATCH] kernel/resource.c: fix muxed resource handling in
 __request_region()

On Mon, 22 Feb 2016 13:49:12 +0000, Alan Cox <alan@...ux.intel.com>
wrote:
> It's not used much, especially nowdays. The use case is basically multi
> I/O chips on the ISA/LPC bus with magic shared config register ports.

This is precisely a super I/O driver (gpio-f7188x) which, when used
with concurrent accesses on an SMP machine triggered the issue which
prompted this patch.

In case information on the original issue is desired:
My original report (ignore attached patch, it was rejected as it
breaks other chips supported by this driver):
  http://permalink.gmane.org/gmane.linux.kernel.gpio/10204
My test procedure (second half of the mail), which I used to validate
the patch against 4.1:
  http://permalink.gmane.org/gmane.linux.kernel.gpio/10216
Simon Guinot & Vincent Donnefort debugging results:
  http://permalink.gmane.org/gmane.linux.kernel.gpio/10521

Regards,
-- 
Vincent Pelletier