linux-kernel - Re: [PATCH v2 2/4] mtd: add a new sys node to show the ecc step size

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Message-ID: <20130810071536.GA3467@norris.computersforpeace.net>
Date:	Sat, 10 Aug 2013 00:15:39 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Huang Shijie <b32955@...escale.com>
Cc:	dwmw2@...radead.org, dedekind1@...il.com,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] mtd: add a new sys node to show the ecc step size

On Wed, May 15, 2013 at 04:46:44PM +0800, Huang Shijie wrote:
> Add a new sys node to show the ecc step size.
> The application then can uses this node to get the ecc step
> size.
> 
> Signed-off-by: Huang Shijie <b32955@...escale.com>
> ---
>  drivers/mtd/mtdcore.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index c400c57..63903b9 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -285,6 +285,16 @@ static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR,
>  		   mtd_bitflip_threshold_show,
>  		   mtd_bitflip_threshold_store);
>  
> +static ssize_t mtd_ecc_step_show(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	struct mtd_info *mtd = dev_get_drvdata(dev);
> +
> +	return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->ecc_step);

ecc_step is an unsigned int, so why cast to unsigned long? Just use:

	return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step);

> +
> +}
> +static DEVICE_ATTR(ecc_step, S_IRUGO, mtd_ecc_step_show, NULL);
> +
>  static struct attribute *mtd_attrs[] = {
>  	&dev_attr_type.attr,
>  	&dev_attr_flags.attr,

...

Brian
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