netdev - Re: [PATCH v1] bridge: Use helpers to handle MAC address

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Date:   Tue, 19 Dec 2017 11:21:55 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        "David S. Miller" <davem@...emloft.net>,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH v1] bridge: Use helpers to handle MAC address

On 12/19/2017 10:10 AM, Andy Shevchenko wrote:
> Use
> 	%pM to print MAC
> 	mac_pton() to convert it from ASCII to binary format, and
> 	ether_addr_copy() to copy.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

(same)
	select GENERIC_NET_UTILS
?

> ---
>  net/bridge/br_sysfs_br.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
> 
> diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
> index 723f25eed8ea..b1be0dcfba6b 100644
> --- a/net/bridge/br_sysfs_br.c
> +++ b/net/bridge/br_sysfs_br.c
> @@ -272,10 +272,7 @@ static ssize_t group_addr_show(struct device *d,
>  			       struct device_attribute *attr, char *buf)
>  {
>  	struct net_bridge *br = to_bridge(d);
> -	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
> -		       br->group_addr[0], br->group_addr[1],
> -		       br->group_addr[2], br->group_addr[3],
> -		       br->group_addr[4], br->group_addr[5]);
> +	return sprintf(buf, "%pM\n", br->group_addr);
>  }
>  
>  static ssize_t group_addr_store(struct device *d,
> @@ -284,14 +281,11 @@ static ssize_t group_addr_store(struct device *d,
>  {
>  	struct net_bridge *br = to_bridge(d);
>  	u8 new_addr[6];
> -	int i;
>  
>  	if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
>  		return -EPERM;
>  
> -	if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
> -		   &new_addr[0], &new_addr[1], &new_addr[2],
> -		   &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
> +	if (!mac_pton(buf, new_addr))
>  		return -EINVAL;
>  
>  	if (!is_link_local_ether_addr(new_addr))
> @@ -306,8 +300,7 @@ static ssize_t group_addr_store(struct device *d,
>  		return restart_syscall();
>  
>  	spin_lock_bh(&br->lock);
> -	for (i = 0; i < 6; i++)
> -		br->group_addr[i] = new_addr[i];
> +	ether_addr_copy(br->group_addr, new_addr);
>  	spin_unlock_bh(&br->lock);
>  
>  	br->group_addr_set = true;
> 


-- 
~Randy