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

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Date:	Wed, 16 Dec 2009 17:47:49 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Wolfgang Grandegger <wg@...ndegger.com>,
	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

> +       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.

Alan
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