linux-kernel - Re: [PATCH 1/2] Add c2 port support.

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Message-ID: <20081022195245.GS4390@tekkaman>
Date:	Wed, 22 Oct 2008 21:52:46 +0200
From:	Rodolfo Giometti <giometti@...eenne.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Add c2 port support.

On Wed, Oct 22, 2008 at 11:11:45AM -0700, Andrew Morton wrote:

> No opinion yet - I haven't review them.
> 
> <looks>
> 
> <wonders why c2port_idr_lock and c2port_idr are kernel-wide symbols>

Fixed.

> <wonders what local_irq_disable() is supposed to achieve on SMP>

The SMP is achieved by mutex_lock(), the local_irq_disable() is used
to avoid interructions in code execution. C2 port has very stringent
timings.

> <spots an error-path memory leak in c2port_device_register>
> 
> <spots a stray semicolon in c2port_device_register>

Can you please explain these two points?

> <suggests that update_lock be initialised at compile-time, not at runtime>

Fixed.

> 
> What I haven't yet got my head around is this:
> 
>   Currently this code supports only flash programming through sysfs
>   interface but extensions shoud be easy to add.
> 
> is that really what we want to use sysfs for?  As the prime interface
> to a device driver (or is it a bus driver?) Didn't we used to use
> device nodes for that sort of thing?

I decided to use this interface since the C2 ports are simple and very
easy to manage with such files abstraction.

Whould you like I repropose the code with the fixed issues for your
review?

Thanks for your suggestions,

Rodolfo

-- 

GNU/Linux Solutions                  e-mail: giometti@...eenne.com
Linux Device Driver                          giometti@...ux.it
Embedded Systems                     phone:  +39 349 2432127
UNIX programming                     skype:  rodolfo.giometti
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