netdev - Re: [PATCH net-next] ieee802154: 6lowpan: remove unnecessary comparison

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Date:   Fri, 8 May 2020 17:09:43 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Yang Yingliang <yangyingliang@...wei.com>, alex.aring@...il.com,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-wpan@...r.kernel.org
Subject: Re: [PATCH net-next] ieee802154: 6lowpan: remove unnecessary
 comparison

Hello.

On 08.05.20 05:52, Yang Yingliang wrote:
> The type of dispatch is u8 which is always '<=' 0xff, so the
> dispatch <= 0xff is always true, we can remove this comparison.
> 
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   net/ieee802154/6lowpan/rx.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/ieee802154/6lowpan/rx.c b/net/ieee802154/6lowpan/rx.c
> index ee17938..b34d050 100644
> --- a/net/ieee802154/6lowpan/rx.c
> +++ b/net/ieee802154/6lowpan/rx.c
> @@ -240,7 +240,7 @@ static inline bool lowpan_is_reserved(u8 dispatch)
>   	return ((dispatch >= 0x44 && dispatch <= 0x4F) ||
>   		(dispatch >= 0x51 && dispatch <= 0x5F) ||
>   		(dispatch >= 0xc8 && dispatch <= 0xdf) ||
> -		(dispatch >= 0xe8 && dispatch <= 0xff));
> +		dispatch >= 0xe8);
>   }
>   
>   /* lowpan_rx_h_check checks on generic 6LoWPAN requirements
> 

This looks good to me. Thanks for fixing this.

Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>

Dave, can you apply this directly to your net tree? I have no other 
ieee802154 fixes pending to fill a pull request.

regards
Stefan Schmidt