netdev - Re: [Patch net v3] ipv6: reorder ip6_route_dev_notifier after ipv6_dev

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Date:   Mon, 08 May 2017 17:32:05 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org, andreyknvl@...gle.com, dsahern@...il.com
Subject: Re: [Patch net v3] ipv6: reorder ip6_route_dev_notifier after
 ipv6_dev_notf

From: Cong Wang <xiyou.wangcong@...il.com>
Date: Mon,  8 May 2017 10:12:13 -0700

> For each netns (except init_net), we initialize its null entry
> in 3 places:
> 
> 1) The template itself, as we use kmemdup()
> 2) Code around dst_init_metrics() in ip6_route_net_init()
> 3) ip6_route_dev_notify(), which is supposed to initialize it after
>    loopback registers
> 
> Unfortunately the last one still happens in a wrong order because
> we expect to initialize net->ipv6.ip6_null_entry->rt6i_idev to
> net->loopback_dev's idev, thus we have to do that after we add
> idev to loopback. However, this notifier has priority == 0 same as
> ipv6_dev_notf, and ipv6_dev_notf is registered after
> ip6_route_dev_notifier so it is called actually after
> ip6_route_dev_notifier. This is similar to commit 2f460933f58e
> ("ipv6: initialize route null entry in addrconf_init()") which
> fixes init_net.
> 
> Fix it by picking a smaller priority for ip6_route_dev_notifier.
> Also, we have to release the refcnt accordingly when unregistering
> loopback_dev because device exit functions are called before subsys
> exit functions.
> 
> Acked-by: David Ahern <dsahern@...il.com>
> Tested-by: David Ahern <dsahern@...il.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied and queued up for -stable, thanks.