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

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Date:   Fri, 11 Aug 2017 09:48:49 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Wei Wang <weiwan@...gle.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

Hi,

On Thu, Aug 10, 2017 at 11:12 AM, John Stultz <john.stultz@...aro.org> wrote:
> On Wed, Aug 9, 2017 at 10:41 PM, Wei Wang <weiwan@...gle.com> wrote:
>> Hi John,
>>
>> Is it possible to try the attached patch?
>
> Thanks so much for the quick turn around!
>
> So I dropped all the reverts you suggested, and applied this one
> against 4.13-rc4, but I'm still seeing the problematic behavior.

Does the following one-line fix make a difference?

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a640fbcba15d..c145a35763a0 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -141,7 +141,7 @@ static void rt6_uncached_list_del(struct rt6_info *rt)
                struct uncached_list *ul = rt->rt6i_uncached_list;

                spin_lock_bh(&ul->lock);
-               list_del(&rt->rt6i_uncached);
+               list_del_init(&rt->rt6i_uncached);
                spin_unlock_bh(&ul->lock);
        }
 }