linux-kernel - Re: [PATCH] spi_imx.c: correct the test on platform_get

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Date:	Fri, 7 Jan 2011 08:26:23 -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] spi_imx.c: correct the test on platform_get_irq() return value

On Fri, Jan 7, 2011 at 7:26 AM, Richard Genoud <richard.genoud@...il.com> wrote:
> The test "if (spi_imx->irq <= 0)" is not testing the IRQ value, but the return value of platform_get_irq().
> As platform_get_irq() can return an error (-ENXIO) or the IRQ value it found, the test should be "if (spi_imx->irq < 0)"
>
> Signed-off-by: Richard Genoud <richard.genoud@...il.com>

For the majority of architectures in Linux, 0 is not a valid IRQ for
devices.  Unless there is an actual imx platform that currently
assigns linux irq 0 to the spi controller then I'd rather not apply
this change.

g.

> ---
>  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) {
>                ret = -EINVAL;
>                goto out_iounmap;
>        }
> --
> 1.7.1
>
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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