netdev - Re: [PATCH v5 1/7] ipv6 addrconf: enable use of proc_dointvec_minmax in addrconf

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Message-ID: <c165e18e-9888-e7cd-deb2-2ccfb1318039@miraclelinux.com>
Date:   Tue, 27 Sep 2016 19:16:04 +0900
From:   YOSHIFUJI Hideaki <hideaki.yoshifuji@...aclelinux.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     hideaki.yoshifuji@...aclelinux.com, netdev@...r.kernel.org,
        Erik Kline <ek@...gle.com>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH v5 1/7] ipv6 addrconf: enable use of proc_dointvec_minmax
 in addrconf_sysctl

Hi,

Maciej Żenczykowski wrote:
> From: Maciej Żenczykowski <maze@...gle.com>
> 
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
> ---
>  net/ipv6/addrconf.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 2f1f5d439788..11fa1a5564d4 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -6044,8 +6044,14 @@ static int __addrconf_sysctl_register(struct net *net, char *dev_name,
>  
>  	for (i = 0; table[i].data; i++) {
>  		table[i].data += (char *)p - (char *)&ipv6_devconf;
> -		table[i].extra1 = idev; /* embedded; no ref */
> -		table[i].extra2 = net;
> +		/* If one of these is already set, then it is not safe to
> +		 * overwrite either of them: this makes proc_dointvec_minmax
> +		 * usable.
> +		 */
> +		if (!table[i].extra1 && !table[i].extra2) {
> +			table[i].extra1 = idev; /* embedded; no ref */
> +			table[i].extra2 = net;
> +		}
>  	}
>  
>  	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
> 

This seems nothing to do with the RFC7559 changes.
Why don't you submit this as a separate patch?

-- 
Hideaki Yoshifuji <hideaki.yoshifuji@...aclelinux.com>
Technical Division, MIRACLE LINUX CORPORATION