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

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Message-ID: <4B292DDE.6080906@grandegger.com>
Date:	Wed, 16 Dec 2009 19:58:38 +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.
> 
> This is a followup to 305b3228f9ff4d59f49e6d34a7034d44ee8ce2f0 that
> changed the return value of platform_get_irq from 0 to -ENXIO on error.
> 
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Cc: David Vrabel <dvrabel@...om.com>
> Cc: Greg Kroah-Hartman <gregkh@...e.de>
> Cc: Urs Thuermann <urs.thuermann@...kswagen.de>
> Cc: Oliver Hartkopp <oliver.hartkopp@...kswagen.de>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Wolfgang Grandegger <wg@...ndegger.com>
> Cc: Kurt Van Dijck <kurt.van.dijck@....be>
> Cc: netdev@...r.kernel.org

Signed-off-by: Wolfgang Grandegger <wg@...ndegger.com>

> ---
>  drivers/net/can/at91_can.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
> index cbe3fce..631d404 100644
> --- a/drivers/net/can/at91_can.c
> +++ b/drivers/net/can/at91_can.c
> @@ -1037,7 +1037,7 @@ static int __init at91_can_probe(struct platform_device *pdev)
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	irq = platform_get_irq(pdev, 0);
> -	if (!res || !irq) {
> +	if (!res || irq <= 0) {
>  		err = -ENODEV;
>  		goto exit_put;
>  	}

Thanks,

Wolfgang.
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