From: Vincent Pelletier <plr.vincent@gmail.com>
To: Alan Cox <alan@linux.intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Simon Guinot <simon.guinot@sequanux.org>,
Giel van Schijndel <me@mortis.eu>,
linux-gpio@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Vincent Donnefort <vdonnefort@gmail.com>,
Yoann Sculo <yoann@sculo.fr>
Subject: Re: [PATCH] kernel/resource.c: fix muxed resource handling in __request_region()
Date: Tue, 23 Feb 2016 09:00:24 +0100 [thread overview]
Message-ID: <20160223090024.2963da69@x2> (raw)
In-Reply-To: <1456148952.24303.273.camel@linux.intel.com>
On Mon, 22 Feb 2016 13:49:12 +0000, Alan Cox <alan@linux.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
next prev parent reply other threads:[~2016-02-23 7:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-20 18:03 gpio-f7188x: Fix concurrent GPIO accesses (and minor improvements) Vincent Pelletier
2015-08-20 18:03 ` [1/4] gpio: gpio-f7188x: Use mutex for access serialisation Vincent Pelletier
2015-08-20 18:03 ` [2/4] gpio: gpio-f7188x: GPIO bank 0 bit 0 is not available on f71869a Vincent Pelletier
2015-08-20 18:03 ` [3/4] gpio: gpio-f7188x: "get" should retrieve sensed level when available Vincent Pelletier
2015-08-20 18:03 ` [4/4] gpio: gpio-f7188x: Implement get_direction Vincent Pelletier
2015-08-21 17:52 ` [1/4] gpio: gpio-f7188x: Use mutex for access serialisation Simon Guinot
2015-08-21 20:48 ` Vincent Pelletier
2015-08-22 17:04 ` Vincent Pelletier
2015-09-03 18:05 ` Vincent Pelletier
2015-09-04 7:39 ` Simon Guinot
2015-09-09 22:01 ` Simon Guinot
2015-09-09 22:15 ` [PATCH] kernel/resource.c: fix muxed resource handling in __request_region() Simon Guinot
2016-02-19 21:10 ` Vincent Pelletier
2016-02-19 23:25 ` Jesse Barnes
2016-02-20 17:11 ` Linus Torvalds
2016-02-20 22:15 ` Jesse Barnes
2016-02-22 13:49 ` Alan Cox
2016-02-22 20:46 ` Jesse Barnes
2016-02-23 16:19 ` Simon Guinot
2016-02-23 17:19 ` Jesse Barnes
2016-02-23 21:38 ` One Thousand Gnomes
2016-02-23 8:00 ` Vincent Pelletier [this message]
2015-09-12 13:26 ` [1/4] gpio: gpio-f7188x: Use mutex for access serialisation Vincent Pelletier
2015-09-04 13:48 ` Vincent Donnefort
2015-09-05 7:43 ` Vincent Pelletier
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