linux-kernel - Re: [PATCH 26/51] Input: atmel_mxt_ts - Move input device init into separate function

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Message-ID: <20130710165341.GB22992@core.coreip.homeip.net>
Date:	Wed, 10 Jul 2013 09:53:41 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Nick Dyer <nick.dyer@...ev.co.uk>
Cc:	Daniel Kurtz <djkurtz@...omium.org>,
	Henrik Rydberg <rydberg@...omail.se>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Alan Bowens <Alan.Bowens@...el.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Meerwald <pmeerw@...erw.net>,
	Benson Leung <bleung@...omium.org>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [PATCH 26/51] Input: atmel_mxt_ts - Move input device init into
 separate function

On Mon, Jul 08, 2013 at 10:41:33AM +0100, Nick Dyer wrote:
> Dmitry Torokhov wrote:
> > On Thu, Jun 27, 2013 at 01:49:01PM +0100, Nick Dyer wrote:
> >> Signed-off-by: Nick Dyer <nick.dyer@...ev.co.uk>
> > 
> > So before we allocated input device before requesting IRQ, now we fo it
> > afterwards so there is moment where the interrupt is requested and not
> > disabled and input device is not allocated yet. Is it possible for
> > interrupt to happen at that moment?
> 
> Yes, and it will be handled correctly, there are guards in the correct
> places to ensure the input device will not be used before being registered.
> 
> It is registered at this point since there are several paths that might
> need the interrupt handler (for example, to handle flash if device is in
> failed state, or to upload configuration if necessary).

OK, thanks.

-- 
Dmitry
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