linux-kernel - Re: [PATCH 1/8] misc: cxl: clean up afu_read

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Message-ID: <1438760880.20978.2.camel@neuling.org>
Date:	Wed, 05 Aug 2015 17:48:00 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Vladimir Zapolskiy <vz@...ia.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Ian Munsie <imunsie@....ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 1/8] misc: cxl: clean up afu_read_config()

On Mon, 2015-07-27 at 00:18 +0300, Vladimir Zapolskiy wrote:
> The sanity checks for overflow are not needed, because this is done on
> caller side in fs/sysfs/file.c
> 
> Signed-off-by: Vladimir Zapolskiy <vz@...ia.com>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: Ian Munsie <imunsie@....ibm.com>
> Cc: Michael Neuling <mikey@...ling.org>

Acked-by: Michael Neuling <mikey@...ling.org>

> ---
>  drivers/misc/cxl/sysfs.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/misc/cxl/sysfs.c b/drivers/misc/cxl/sysfs.c
> index 31f38bc..87cd747 100644
> --- a/drivers/misc/cxl/sysfs.c
> +++ b/drivers/misc/cxl/sysfs.c
> @@ -443,12 +443,7 @@ static ssize_t afu_read_config(struct file *filp, struct kobject *kobj,
>  	struct afu_config_record *cr = to_cr(kobj);
>  	struct cxl_afu *afu = to_cxl_afu(container_of(kobj->parent, struct device, kobj));
>  
> -	u64 i, j, val, size = afu->crs_len;
> -
> -	if (off > size)
> -		return 0;
> -	if (off + count > size)
> -		count = size - off;
> +	u64 i, j, val;
>  
>  	for (i = 0; i < count;) {
>  		val = cxl_afu_cr_read64(afu, cr->cr, off & ~0x7);

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