linux-kernel - Re: [PATCH 2/2] s390/qdio_debug: Use kstrtoul_from

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Date:	Tue, 7 Jun 2011 12:27:48 +0200
From:	Jan Glauber <jang@...ux.vnet.ibm.com>
To:	Peter Huewe <peterhuewe@....de>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>, linux390@...ibm.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Frank Blaschka <frank.blaschka@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2] s390/qdio_debug: Use kstrtoul_from_user

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@....de>

Acked-by: Jan Glauber <jang@...ux.vnet.ibm.com>

> ---
>  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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