linux-kernel - Re: [PATCH 2/3] debugfs: move to new kstrtobool function

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Date:	Thu, 24 Mar 2011 09:20:07 +1300
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Jonathan Cameron <jic23@....ac.uk>
CC:	linux-kernel@...r.kernel.org, greg@...ah.com,
	rusty@...tcorp.com.au, adobriyan@...il.com
Subject: Re: [PATCH 2/3] debugfs: move to new kstrtobool function

On 03/24/2011 02:39 AM, Jonathan Cameron wrote:
> No functional changes requires that we eat errors from
> kstrtobool.  Note *val is still only updated if a valid
> input is found.
> 
> Signed-off-by: Jonathan Cameron <jic23@....ac.uk>
> ---
>  fs/debugfs/file.c |   19 ++++++-------------
>  1 files changed, 6 insertions(+), 13 deletions(-)
> 
> diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> index 89d394d..fed4485 100644
> --- a/fs/debugfs/file.c
> +++ b/fs/debugfs/file.c
> @@ -429,25 +429,18 @@ static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
>  {
>  	char buf[32];
>  	int buf_size;
> +	int ret;
> +	bool bv;
>  	u32 *val = file->private_data;
>  
>  	buf_size = min(count, (sizeof(buf)-1));
>  	if (copy_from_user(buf, user_buf, buf_size))
>  		return -EFAULT;
>  
> -	switch (buf[0]) {
> -	case 'y':
> -	case 'Y':
> -	case '1':
> -		*val = 1;
> -		break;
> -	case 'n':
> -	case 'N':
> -	case '0':
> -		*val = 0;
> -		break;
> -	}
> -	
> +	ret = kstrtobool(buf, &bv);
> +	if (!ret)
> +		*val = bv;
> +
>  	return count;

Shouldn't this be:

	ret = kstrtobool(buf, &bv);
	if (ret)
		return ret;

	*val = bv;
	return count;

?

~Ryan

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