linux-kernel - Re: [PATCH] mmc: mmc_spi: Fix return value evaluation of irq_of_parse_and

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Message-ID: <878v6ussmw.fsf@octavius.laptop.org>
Date:	Mon, 11 Feb 2013 11:49:11 -0500
From:	Chris Ball <cjb@...top.org>
To:	Roland Stigge <stigge@...com.de>
Cc:	plagnioj@...osoft.com, grant.likely@...retlab.ca,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mmc: mmc_spi: Fix return value evaluation of irq_of_parse_and_map()

Hi,

On Wed, Jan 30 2013, Roland Stigge wrote:
> When irq_of_parse_and_map() returns an error, it does as zero. But in
> mmc_spi_get_pdata(), the error return case is compared against NO_IRQ. This
> might work where NO_IRQ is zero (defaults to zero when undefined, as on MIPS)
> but not where NO_IRQ is sth. different, e.g. on ARM, where it is -1.
>
> This patch changes to comparison with 0 which is the error return value of
> irq_of_parse_and_map(). 
>
> Tested on ARM that mmc_spi is working now.
>
> Signed-off-by: Roland Stigge <stigge@...com.de>
>
> diff --git a/drivers/mmc/host/of_mmc_spi.c b/drivers/mmc/host/of_mmc_spi.c
> index 1534b58..d720b5e 100644
> --- a/drivers/mmc/host/of_mmc_spi.c
> +++ b/drivers/mmc/host/of_mmc_spi.c
> @@ -146,7 +146,7 @@ struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
>  		oms->pdata.get_ro = of_mmc_spi_get_ro;
>  
>  	oms->detect_irq = irq_of_parse_and_map(np, 0);
> -	if (oms->detect_irq != NO_IRQ) {
> +	if (oms->detect_irq != 0) {
>  		oms->pdata.init = of_mmc_spi_init;
>  		oms->pdata.exit = of_mmc_spi_exit;
>  	} else {

Thanks, pushed to mmc-next for 3.9.

- Chris.
-- 
Chris Ball   <cjb@...top.org>   <http://printf.net/>
One Laptop Per Child
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