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

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Message-ID: <4B290A57.3010705@grandegger.com>
Date:	Wed, 16 Dec 2009 17:27:03 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	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

Uwe Kleine-König wrote:
> platform_get_irq returns -ENXIO on failure, so !irq was probably
> always true.  Better use (int)irq <= 0.  Note that a return value of
> zero is still handled as error even though this could mean irq0.

But only on ARM, which is the only platform still using the infamous
NO_IRQ (=-1). As this is a driver for ARM hardware, using irq == NO_IRQ
would make sense, though.

Wolfgang.
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