linux-kernel - Re: [PATCH] pata_of_platform: fix no irq handling

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Date:	Tue, 07 Oct 2008 17:18:38 +0800
From:	Wang Jian <lark@...ux.net.cn>
To:	Tejun Heo <tj@...nel.org>
CC:	avorontsov@...mvista.com, Matt Sealey <matt@...esi-usa.com>,
	Jeff Garzik <jgarzik@...ox.com>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Li Yang <leoli@...escale.com>
Subject: Re: [PATCH] pata_of_platform: fix no irq handling

Tejun Heo wrote:
> Anton Vorontsov wrote:
>> On Mon, Oct 06, 2008 at 03:41:19PM -0500, Matt Sealey wrote:
>>> There is a simple problem with the patch which is that an "IRQ 0" can and does
>>> actually exist on a bunch of platforms, at least to the best of my knowledge.
>>>
>>> Checking for -1 (which means for definite, no irq at all, because it is
>>> totally unambiguous, as a -1 IRQ numbering is "impossible") is more correct.
>> This was discussed years ago.
>>
>> http://lkml.org/lkml/2005/11/22/159
>> http://lkml.org/lkml/2005/11/22/227
>>
> 
> Would this break any existing platforms?  If so, can those be fixed
> together or does it become a much bigger problem that way?
> 

Pata_of_platform stacks upon pata_platform. This patch fixes problem
concerning definition of "no irq" without touch any other place.  So
far I can't see any new problem.
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