linux-kernel - Re: [PATCH -next] usb: gadget: Remove dead branch code

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Message-ID: <20190306004633.GU14928@pendragon.ideasonboard.com>
Date:   Wed, 6 Mar 2019 02:46:33 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     gregkh@...uxfoundation.org, balbi@...nel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH -next] usb: gadget: Remove dead branch code

Hello YueHaibing,

Thank you for the patch.

On Wed, Jan 23, 2019 at 10:31:36PM +0800, YueHaibing wrote:
> 'num' is a u8 variable, it never greater than 255,
> So the if branch is dead code and can be removed.
> 
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/usb/gadget/function/uvc_configfs.c | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
> index bc1e2af..8fe85cb 100644
> --- a/drivers/usb/gadget/function/uvc_configfs.c
> +++ b/drivers/usb/gadget/function/uvc_configfs.c
> @@ -1570,10 +1570,6 @@ uvcg_uncompressed_##cname##_store(struct config_item *item,		\
>  	if (ret)							\
>  		goto end;						\
>  									\
> -	if (num > 255) {						\
> -		ret = -EINVAL;						\
> -		goto end;						\
> -	}								\
>  	u->desc.aname = num;						\
>  	ret = len;							\
>  end:									\
> @@ -1767,10 +1763,6 @@ uvcg_mjpeg_##cname##_store(struct config_item *item,			\
>  	if (ret)							\
>  		goto end;						\
>  									\
> -	if (num > 255) {						\
> -		ret = -EINVAL;						\
> -		goto end;						\
> -	}								\
>  	u->desc.aname = num;						\
>  	ret = len;							\
>  end:									\

-- 
Regards,

Laurent Pinchart