linux-kernel - Re: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver

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Date:	Fri, 12 Oct 2007 21:21:11 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Bryan Wu <bryan.wu@...log.com>,
	linux-input@...ey.karlin.mff.cuni.cz,
	linux-joystick@...ey.karlin.mff.cuni.cz,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver

On Fri, Oct 12, 2007 at 01:29:31PM -0400, Dmitry Torokhov wrote:
> Hi Ahmed,
> 

Hi :),

> On 10/12/07, Ahmed S. Darwish <darwish.07@...il.com> wrote:
> > On Fri, Oct 12, 2007 at 03:38:47PM +0800, Bryan Wu wrote:
> > >
> > > Signed-off-by: Bryan Wu <bryan.wu@...log.com>
> > > ---
> >
> > Hi Bryan,
> >
> > Why creating module's own kthread to call ad7142_decode and process keycodes
> > instead of using a tasklet ?
> >
> 
> Yo can't access i2c from a tasklet context.
> 
> > Isn't disabling device interrupts from the begining of the ISR "ad7142_interrupt"
> > till the kthread "ad7142_thread" got waked-up and scheduled a long time,
> > espicially if there's a high load on the userspace side ?
> >
> 
> It is OK - you disable a specific interrupt line preventing it from
> raising any more IRQs until current one is serviced. 

Won't this affect system responsiveness if the IRQ line was shared ?

>
> This is different from disabling interrupts on CPU.
> 

mm, Why disabling interrupts in general. Doesn't IRQ hanlers of the same kind got
executed in a serialized fashion even on SMPs ?. If so, why not just wakeup our
custom-thread or use workqueues and let them do their business ?

It's the first time for me to read others' patches carefully and kindly ask about
some explanations. I hope I'm not bothering people with my misunderstandings!
(till I get more experienced).


Thanks,

-- 
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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