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Message-ID: <20160223090024.2963da69@x2> 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
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