From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Ahern <dsahern@gmail.com>
Subject: Re: [PATCH net] ipv6: no need to return rt->dst.error if it is not
 null entry.
Date: Mon, 24 Jul 2017 21:28:07 -0600
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Cc: network dev <netdev@vger.kernel.org>,
        Roopa Prabhu <roopa@cumulusnetworks.com>
To: Hangbin Liu <liuhangbin@gmail.com>,
        Cong Wang <xiyou.wangcong@gmail.com>
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On 7/24/17 6:08 PM, Hangbin Liu wrote:
> That's why I think we should remove both rt->dst.error and ip6_null_entry
> check in inet6_rtm_getroute(). And even further, remove the ip6_null_entry
> check in rt6_dump_route().

git blame net/ipv6/route.c

find the commits and review.