drbd: fix various disconnecting races
If an admin requests disconnect at a time when the state handling already disconnects/reconnects, there have been some races. Make sure to always really stop the network threads before returning success for disconnect. Do not pretend successfull forced disconnect, if the state handling returned an error. Return success from drbd_adm_down() only after all threads are finished. Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com>
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