linux-kernel - Re: [PATCH 1/2] spi_imx.c: CSPI3 irq is 0 on imx25

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Message-ID: <20101223185921.GB20384@angua.secretlab.ca>
Date:	Thu, 23 Dec 2010 11:59:21 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Richard Genoud <richard.genoud@...il.com>
Cc:	spi-devel-general@...ts.sourceforge.net,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] spi_imx.c: CSPI3 irq is 0 on imx25

On Thu, Dec 23, 2010 at 12:12:09PM +0100, Richard Genoud wrote:
> On imx25 soc, MX25_INT_CSPI3 is 0
> (cf arch/arm/plat-mxc/include/mach/mx25.h).
> So, the test (spi_imx->irq <= 0) returned an error
> for this platform.
> This patch corrects this behaviour.
> 
> Signed-off-by: Richard Genoud <richard.genoud@...il.com>
> ---
>  drivers/spi/spi_imx.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
> index 55a38e2..793ae99 100644
> --- a/drivers/spi/spi_imx.c
> +++ b/drivers/spi/spi_imx.c
> @@ -847,7 +847,7 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
>  	}
>  
>  	spi_imx->irq = platform_get_irq(pdev, 0);
> -	if (spi_imx->irq <= 0) {
> +	if (spi_imx->irq < 0) {

I *really* don't want to apply this.  The kernel is slowly moving
toward NO_IRQ == 0 for all architectures.  This patch is a step in the
wrong direction because it will break with ARM starts using 0 for
NO_IRQ.

I would accept a change to spi_imx->irq == NO_IRQ however.

g.
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