[Devel] [PATCH rh7] ipv6: don't disable interface if last ipv6 address is removed

[Kirill Tkhai]

This is fix for BUG https://jira.sw.ru/browse/PSBM-43870

On 04.02.2016 19:19, Kirill Tkhai wrote:
> Port commit 876fd05ddbae03166e7037fca957b55bb3be6594 from mainstream:
> 
> The reason behind this change is that as soon as we delete
> the last ipv6 address of an interface we also lose the
> /proc/sys/net/ipv6/conf/<interface> directory. This seems to be a
> usability problem for me.
> 
> I don't see any reason why we should shutdown ipv6 on that interface in
> such cases.
> 
> Cc: YOSHIFUJI Hideaki <yoshfuji at linux-ipv6.org>
> Signed-off-by: Hannes Frederic Sowa <hannes at stressinduktion.org>
> Signed-off-by: David S. Miller <davem at davemloft.net>
> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
> ---
>  net/ipv6/addrconf.c |    7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index b3627bf..8bb298f 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -2523,13 +2523,6 @@ static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *p
>  			read_unlock_bh(&idev->lock);
>  
>  			ipv6_del_addr(ifp);
> -
> -			/* If the last address is deleted administratively,
> -			   disable IPv6 on this interface.
> -			 */
> -			if (list_empty(&idev->addr_list))
> -				addrconf_ifdown(idev->dev,
> -						!(idev->dev->flags & IFF_LOOPBACK));
>  			return 0;
>  		}
>  	}
> 
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