From: Maxim Levitsky <maximlevitsky@gmail.com>
To: Andy Walls <awalls@md.metrocast.net>
Cc: lirc-list@lists.sourceforge.net,
Jarod Wilson <jarod@wilsonet.com>,
linux-input@vger.kernel.org, linux-media@vger.kernel.org,
Mauro Carvalho Chehab <mchehab@redhat.com>,
Christoph Bartelmus <lirc@bartelmus.de>
Subject: Re: [PATCH 04/13] IR: fix locking in ir_raw_event_work
Date: Fri, 30 Jul 2010 14:02:50 +0300 [thread overview]
Message-ID: <1280487770.3646.1.camel@maxim-laptop> (raw)
In-Reply-To: <1280457769.15737.72.camel@localhost>
On Thu, 2010-07-29 at 22:42 -0400, Andy Walls wrote:
> On Fri, 2010-07-30 at 05:17 +0300, Maxim Levitsky wrote:
> > It is prefectly possible to have ir_raw_event_work
> > running concurently on two cpus, thus we must protect
> > it from that situation.
>
> Yup, the work is marked as not pending (and hence reschedulable) just
> before the work handler is run.
>
>
> > Maybe better solution is to ditch the workqueue at all
> > and use good 'ol thread per receiver, and just wake it up...
>
> I suppose you could also use a single threaded workqueue instead of a
> mutex, and let a bit test provide exclusivity. With the mutex, when the
> second thread finally obtains the lock, there will likely not be
> anything for it to do.
Mutex there is for another reason, to protect against decoder
insert/removal.
However, I think its best just to use a bare kthread for the purpose of
this.
Best regards,
Maxim Levitsky
next prev parent reply other threads:[~2010-07-30 11:02 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-30 2:17 [PATCH 0/9 v2] IR: few fixes, additions and ENE driver Maxim Levitsky
2010-07-30 2:17 ` [PATCH 01/13] IR: Kconfig fixes Maxim Levitsky
2010-07-30 2:17 ` [PATCH 02/13] IR: minor fixes: Maxim Levitsky
2010-07-30 2:17 ` [PATCH 03/13] IR: replace spinlock with mutex Maxim Levitsky
2010-07-30 2:17 ` [PATCH 04/13] IR: fix locking in ir_raw_event_work Maxim Levitsky
2010-07-30 2:42 ` Andy Walls
2010-07-30 11:02 ` Maxim Levitsky [this message]
2010-07-30 2:17 ` [PATCH 05/13] IR: JVC: make repeat work Maxim Levitsky
2010-07-30 2:17 ` [PATCH 06/13] IR: nec decoder: fix repeat Maxim Levitsky
2010-07-30 2:50 ` Andy Walls
2010-07-30 2:17 ` [PATCH 07/13] IR: NECX: support repeat Maxim Levitsky
2010-07-30 2:17 ` [PATCH 08/13] IR: Allow not to compile keymaps in Maxim Levitsky
2010-07-30 2:17 ` [PATCH 09/13] IR: add helper function for hardware with small o/b buffer Maxim Levitsky
2010-07-30 2:17 ` [PATCH 10/13] IR: extend interfaces to support more device settings LIRC: add new IOCTL that enables learning mode (wide band receiver) Maxim Levitsky
2010-07-30 2:17 ` [PATCH 11/13] IR: report unknown scancodes the in-kernel decoders found Maxim Levitsky
2010-07-30 2:17 ` [PATCH 12/13] STAGING: remove lirc_ene0100 driver Maxim Levitsky
2010-07-30 2:17 ` [PATCH 13/13] IR: Port ene driver to new IR subsystem and enable it Maxim Levitsky
2010-07-30 2:39 ` Jon Smirl
2010-07-30 3:46 ` Andy Walls
2010-07-30 11:36 ` Maxim Levitsky
2010-07-30 11:51 ` Jon Smirl
2010-07-30 11:51 ` Jon Smirl
2010-07-30 11:54 ` Maxim Levitsky
2010-07-30 12:02 ` Jon Smirl
2010-07-30 12:07 ` Jon Smirl
2010-07-30 12:45 ` Maxim Levitsky
2010-07-31 13:55 ` Andy Walls
2010-07-31 14:28 ` Maxim Levitsky
2010-07-31 14:37 ` Jon Smirl
2010-07-31 14:37 ` Jon Smirl
2010-07-31 14:51 ` Maxim Levitsky
2010-07-31 15:12 ` Andy Walls
2010-07-31 16:25 ` Jon Smirl
2010-07-31 16:25 ` Jon Smirl
2010-07-31 16:44 ` Maxim Levitsky
2010-07-31 16:51 ` Maxim Levitsky
2010-07-31 17:47 ` Christoph Bartelmus
2010-07-31 17:47 ` Christoph Bartelmus
2010-07-31 18:14 ` Jon Smirl
2010-07-31 18:14 ` Jon Smirl
2010-07-31 18:33 ` Jon Smirl
2010-07-31 18:51 ` Andy Walls
2010-07-31 21:53 ` Jon Smirl
2010-07-31 21:53 ` Jon Smirl
2010-07-31 23:26 ` Maxim Levitsky
2010-08-01 9:43 ` Christoph Bartelmus
2010-08-01 9:43 ` Christoph Bartelmus
2010-08-02 15:12 ` Remote that breaks current system (was: IR: Port ene driver...) it Jarod Wilson
2010-08-02 15:12 ` Jarod Wilson
2010-08-02 16:11 ` Jon Smirl
2010-08-02 16:42 ` Remote that breaks current system Christoph Bartelmus
2010-08-02 16:42 ` Christoph Bartelmus
2010-08-02 17:13 ` Jon Smirl
2010-08-02 18:09 ` Jarod Wilson
2010-08-02 18:09 ` Jarod Wilson
2010-08-02 20:42 ` Jon Smirl
2010-08-02 20:42 ` Jon Smirl
2010-08-11 14:38 ` Jarod Wilson
2010-08-11 14:38 ` Jarod Wilson
2010-08-12 6:46 ` Christoph Bartelmus
2010-08-12 6:46 ` Christoph Bartelmus
2010-08-16 4:04 ` Jarod Wilson
2010-08-16 20:41 ` Maxim Levitsky
2010-08-17 0:14 ` Jarod Wilson
2010-08-17 3:30 ` Mauro Carvalho Chehab
2010-08-17 3:40 ` Jarod Wilson
2010-08-02 17:51 ` Jarod Wilson
2010-08-01 9:50 ` [PATCH 13/13] IR: Port ene driver to new IR subsystem and enable it Christoph Bartelmus
2010-08-01 9:50 ` Christoph Bartelmus
2010-08-01 14:00 ` Jon Smirl
2010-08-01 14:00 ` Jon Smirl
2010-08-01 14:05 ` Jon Smirl
2010-08-01 15:13 ` Christoph Bartelmus
2010-08-01 15:13 ` Christoph Bartelmus
2010-07-30 11:38 [PATCH 0/9 v3] IR: few fixes, additions and ENE driver Maxim Levitsky
2010-07-30 11:38 ` [PATCH 04/13] IR: fix locking in ir_raw_event_work Maxim Levitsky
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