Re: [PATCH 2/2] s390/qdio_debug: Use kstrtoul_from_user

[Jan Glauber]

On Mon, Jun 06, 2011 at 11:07:54PM +0200, Peter Huewe wrote:
> This patch replaces the code for getting an unsigned long from a
> userspace buffer by a simple call to kstroul_from_user.
> This makes it easier to read and less error prone.
> 
> Kernel Version: v3.0-rc2
> 
> Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>

Acked-by: Jan Glauber <jang@xxxxxxxxxxxxxxxxxx>

> ---
>  drivers/s390/cio/qdio_debug.c |   12 +++---------
>  1 files changed, 3 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/s390/cio/qdio_debug.c b/drivers/s390/cio/qdio_debug.c
> index f8b03a6..0e615cb 100644
> --- a/drivers/s390/cio/qdio_debug.c
> +++ b/drivers/s390/cio/qdio_debug.c
> @@ -188,19 +188,13 @@ static ssize_t qperf_seq_write(struct file *file, const char __user *ubuf,
>  	struct qdio_irq *irq_ptr = seq->private;
>  	struct qdio_q *q;
>  	unsigned long val;
> -	char buf[8];
>  	int ret, i;
> 
>  	if (!irq_ptr)
>  		return 0;
> -	if (count >= sizeof(buf))
> -		return -EINVAL;
> -	if (copy_from_user(&buf, ubuf, count))
> -		return -EFAULT;
> -	buf[count] = 0;
> -
> -	ret = strict_strtoul(buf, 10, &val);
> -	if (ret < 0)
> +
> +	ret = kstrtoul_from_user(ubuf, count, 10, &val);
> +	if (ret)
>  		return ret;
> 
>  	switch (val) {
> -- 
> 1.7.3.4
> 
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