From: Simon Guinot <simon.guinot@sequanux.org>
To: Vincent Pelletier <plr.vincent@gmail.com>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
Vincent Donnefort <vdonnefort@gmail.com>,
Yoann Sculo <yoann@sculo.fr>
Subject: Re: [1/4] gpio: gpio-f7188x: Use mutex for access serialisation.
Date: Thu, 10 Sep 2015 00:01:40 +0200 [thread overview]
Message-ID: <20150909220140.GD9892@kw.sim.vm.gnt> (raw)
In-Reply-To: <20150903200540.399a96b8@x2>
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On Thu, Sep 03, 2015 at 08:05:40PM +0200, Vincent Pelletier wrote:
> Hi,
>
> On Fri, 21 Aug 2015 22:48:24 +0200, Vincent Pelletier
> <plr.vincent@gmail.com> wrote:
> > On Fri, 21 Aug 2015 19:52:16 +0200, Simon Guinot
> > <simon.guinot@sequanux.org> wrote:
> > > Please, could you describe a setup (as simple as possible) allowing to
> > > reproduce the issue ? I'll try it on my side.
> > [...]
> > > Please try to make the module list needed to reproduce the issue as
> > > short as possible. Ideally only gpio_f7188x would be needed.
> >
> > The simplest I could find so far needs gpio-input-polled with 20ms
> > polling period (I didn't try to change polling period), and a shell loop
> > writing to gpioXX/value.
>
> Have you had a chance to reproduce this issue ?
> Can I do something to help ?
Hi Vincent,
Vincent (Donnefort) finally succeeds to reproduce the issue. The setup
is quite simple. You only have to flood the gpio-f7188x driver via the
sysfs GPIO interface. Nothing more is needed.
After some debugging we discovered that the problem comes from the
__request_region function which don't handle very well concurrent
requests on a muxed region.
I will send a patch as a reply to this email. Please, can you test it ?
Thanks,
Simon
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next prev parent reply other threads:[~2015-09-09 21:55 UTC|newest]
Thread overview: 27+ 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 [this message]
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
2016-02-20 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
2016-02-24 14:25 ` [PATCH] kernel/resource.c: ensure parent is not freed " Simon Guinot
2016-02-23 8:00 ` [PATCH] kernel/resource.c: fix muxed resource handling " Vincent Pelletier
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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