linux-kernel - Re: [PATCH -next] USB: gadget: f_fs: Use ERR_CAST instead of ERR_PTR(PTR

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Date:   Fri, 21 May 2021 13:48:44 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     balbi@...nel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] USB: gadget: f_fs: Use ERR_CAST instead of
 ERR_PTR(PTR_ERR(...))

On Wed, May 19, 2021 at 10:30:32AM +0800, YueHaibing wrote:
> A coccicheck run provided information like the following.
> 
> ./drivers/usb/gadget/function/f_fs.c:3832:9-16:
>  WARNING: ERR_CAST can be used with data
> 
> Use ERR_CAST to fix this.
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  drivers/usb/gadget/function/f_fs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index bf109191659a..61110ff52f49 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -3829,7 +3829,7 @@ static char *ffs_prepare_buffer(const char __user *buf, size_t len)
>  
>  	data = memdup_user(buf, len);
>  	if (IS_ERR(data))
> -		return ERR_PTR(PTR_ERR(data));
> +		return ERR_CAST(data);

This should just be:
		return PTR_ERR(data);
right?

No need for 2 casts to happen here.

thanks,

greg k-h