linux-kernel - Re: [PATCH v2 02/18] fpga: dfl: fme: remove copy_to

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Message-ID: <20190507172545.GA26690@archbox>
Date:   Tue, 7 May 2019 10:26:18 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     Wu Hao <hao.wu@...el.com>
Cc:     atull@...nel.org, mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        Xu Yilun <yilun.xu@...el.com>
Subject: Re: [PATCH v2 02/18] fpga: dfl: fme: remove copy_to_user() in ioctl
 for PR

On Mon, Apr 29, 2019 at 04:55:35PM +0800, Wu Hao wrote:
> This patch removes copy_to_user() code in partial reconfiguration
> ioctl, as it's useless as user never needs to read the data
> structure after ioctl.
> 
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
> v2: clean up code split from patch 2 in v1 patchset.
> ---
>  drivers/fpga/dfl-fme-pr.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/fpga/dfl-fme-pr.c b/drivers/fpga/dfl-fme-pr.c
> index d9ca955..6ec0f09 100644
> --- a/drivers/fpga/dfl-fme-pr.c
> +++ b/drivers/fpga/dfl-fme-pr.c
> @@ -159,9 +159,6 @@ static int fme_pr(struct platform_device *pdev, unsigned long arg)
>  	mutex_unlock(&pdata->lock);
>  free_exit:
>  	vfree(buf);
> -	if (copy_to_user((void __user *)arg, &port_pr, minsz))
> -		return -EFAULT;
> -
>  	return ret;
>  }
>  
> -- 
> 1.8.3.1
>