linux-kernel - Re: [PATCH 4/7] can/at91: don't check platform_get

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Message-ID: <4B29DB0B.1060109@grandegger.com>
Date:	Thu, 17 Dec 2009 08:17:31 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	David Vrabel <dvrabel@...om.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Urs Thuermann <urs.thuermann@...kswagen.de>,
	Oliver Hartkopp <oliver.hartkopp@...kswagen.de>,
	"David S. Miller" <davem@...emloft.net>,
	Kurt Van Dijck <kurt.van.dijck@....be>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 4/7] can/at91: don't check platform_get_irq's return value
 against zero

Alan Cox wrote:
>> +       if (!res || irq <= (int)NO_IRQ) {
>>
>> but this looks too ugly.  (IMHO using NO_IRQ is already ugly.)
> 
> No IRQ was a private variable for the drivers/ide stack internally and
> only present in any form on a few odd platforms where it got "borrowed"
> and hasn't yet been eliminated
> 
> The absence of an IRQ is zero. A bus IRQ of zero is remapped by the OS.

OK, I was remembering some old issues with NO_IRQ. Next time I will read
the commit message more carefully. Sorry for the noise.

Wolfgang.
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