linux-kernel - Re: [PATCH net-next] tipc: Use is_broadcast_ether

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Message-ID: <d8491b36-d81b-c2e8-de04-fd1c4a1254ba@windriver.com>
Date:   Mon, 3 Aug 2020 21:51:45 +0800
From:   Ying Xue <ying.xue@...driver.com>
To:     Huang Guobin <huangguobin4@...wei.com>, jmaloy@...hat.com,
        davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, tipc-discussion@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] tipc: Use is_broadcast_ether_addr() instead of
 memcmp()

On 8/3/20 10:00 AM, Huang Guobin wrote:
> Using is_broadcast_ether_addr() instead of directly use
> memcmp() to determine if the ethernet address is broadcast
> address.
> 
> spatch with a semantic match is used to found this problem.
> (http://coccinelle.lip6.fr/)
> 
> Signed-off-by: Huang Guobin <huangguobin4@...wei.com>

Acked-by: Ying Xue <ying.xue@...driver.com>

> ---
>  net/tipc/eth_media.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
> index 8b0bb600602d..c68019697cfe 100644
> --- a/net/tipc/eth_media.c
> +++ b/net/tipc/eth_media.c
> @@ -62,12 +62,10 @@ static int tipc_eth_raw2addr(struct tipc_bearer *b,
>  			     struct tipc_media_addr *addr,
>  			     char *msg)
>  {
> -	char bcast_mac[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
> -
>  	memset(addr, 0, sizeof(*addr));
>  	ether_addr_copy(addr->value, msg);
>  	addr->media_id = TIPC_MEDIA_TYPE_ETH;
> -	addr->broadcast = !memcmp(addr->value, bcast_mac, ETH_ALEN);
> +	addr->broadcast = is_broadcast_ether_addr(addr->value);
>  	return 0;
>  }
>  
>