netdev - Re: [PATCH net] ipv6: make ip6_create_rt_rcu return ip6_null

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Message-ID: <9fb8564a-ea22-e6a6-b804-95157825cf94@cumulusnetworks.com>
Date:   Tue, 19 Mar 2019 22:14:42 +0100
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     Paolo Abeni <pabeni@...hat.com>, Wei Wang <weiwan@...gle.com>,
        network dev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] ipv6: make ip6_create_rt_rcu return ip6_null_entry
 instead of NULL

On 3/19/19 7:21 PM, Xin Long wrote:
> I will post v2 by moving down 'fallback:':
> 
> { ...
>         if (!fib6_info_hold_safe(rt))
>                 goto fallback;
> 
>         nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
>         if (!nrt) {
>                 fib6_info_release(rt);
>                 goto fallback;
>         }
> 
>         ip6_rt_copy_init(nrt, rt);
>         return nrt;
> 
> fallback:
>         nrt = dev_net(dev)->ipv6.ip6_null_entry;
>         dst_hold(&nrt->dst);
>         return nrt;
> }

I think that is the more typical pattern. Thanks,