The control channel calls registered callbacks when control messages
such as XDomain protocol messages are received. The control channel
handling is done in a worker running on system workqueue which means the
networking driver can't run tear down flow which includes sending
disconnect request and waiting for a reply in the same worker. Otherwise
reply is never received (as the work is already running) and the
operation times out.

To fix this run disconnect ThunderboltIP flow asynchronously once
ThunderboltIP logout message is received.

Fixes: e69b6c02 ("net: Add support for networking over Thunderbolt cable")
Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: NDavid S. Miller <davem@davemloft.net>