linux-kernel - Re: unregister_netdevice: waiting for eth0 to become free. Usage count = 1

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Message-ID: <ddebbddc-bb66-ed0f-423a-277d40f99f66@gmail.com>
Date:   Fri, 11 Aug 2017 21:37:00 -0600
From:   David Ahern <dsahern@...il.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Martin KaFai Lau <kafai@...com>,
        lkml <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
Subject: Re: unregister_netdevice: waiting for eth0 to become free. Usage
 count = 1

On 8/11/17 6:25 PM, Wei Wang wrote:
> By "a patch to fix that" do you mean after your patch, for every rt6,
> rt6->rt6i_idev will be the same as rt6->dst.dev?

FIB entries should have them the same device with my patch.

The copies done (ip6_rt_cache_alloc and ip6_rt_pcpu_alloc) will have to
set dst.dev to loopback or VRF device for RTF_LOCAL routes; it's the
only way to get local traffic to work and this is similar to what IPv4 does.