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

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Message-ID: <CALAqxLXG8X2nkLEHM63oiY=M17vcpU2+-ec7x_aBWDCqrj4U-Q@mail.gmail.com>
Date:   Mon, 7 Aug 2017 14:15:32 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     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 Mon, Aug 7, 2017 at 2:05 PM, John Stultz <john.stultz@...aro.org> wrote:
> So, with recent testing with my HiKey board, I've been noticing some
> quirky behavior with my USB eth adapter.
>
> Basically, pluging the usb eth adapter in and then removing it, when
> plugging it back in I often find that its not detected, and the system
> slowly spits out the following message over and over:
>   unregister_netdevice: waiting for eth0 to become free. Usage count = 1

The other bit is that after this starts printing, the board will no
longer reboot (it hangs continuing to occasionally print the above
message), and I have to manually reset the device.

thanks
-john