linux-kernel - Re: [PATCH 6/7] spi/mpc8xxx: don't check platform_get

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Message-ID: <20091217163944.GA6453@oksana.dev.rtsoft.ru>
Date:	Thu, 17 Dec 2009 19:39:44 +0300
From:	Anton Vorontsov <avorontsov@...mvista.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>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Grant Likely <grant.likely@...retlab.ca>,
	Kumar Gala <galak@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	spi-devel-general@...ts.sourceforge.net
Subject: Re: [PATCH 6/7] spi/mpc8xxx: don't check platform_get_irq's return
 value against zero

On Wed, Dec 16, 2009 at 05:10:08PM +0100, 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: David Brownell <dbrownell@...rs.sourceforge.net>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Kumar Gala <galak@...nel.crashing.org>
> Cc: Anton Vorontsov <avorontsov@...mvista.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: spi-devel-general@...ts.sourceforge.net
> ---
>  drivers/spi/spi_mpc8xxx.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
> index e9390d7..b13501a 100644
> --- a/drivers/spi/spi_mpc8xxx.c
> +++ b/drivers/spi/spi_mpc8xxx.c
> @@ -1339,7 +1339,7 @@ static int __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  
>  	irq = platform_get_irq(pdev, 0);
> -	if (!irq)
> +	if ((int)irq <= 0)

I tend to think that it's really hopeless to fix the
platform_get_irq() in its current form, so can you get rid
of this ugly cast and just make the irq signed?

And I'll be fine with it. :-(

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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