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Also there's a race in the disconnect implemenation. First shut down, then unplug, leaves a window where userspace could sneak in and restart the entire machinery. With this we can also delete the very un-atomic global pipe_enabled tracking. Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Cc: Hans de Goede <hdegoede@redhat.com> Cc: "Noralf Trønnes" <noralf@tronnes.org> Link: https://patchwork.freedesktop.org/patch/msgid/20200323144950.3018436-45-daniel.vetter@ffwll.ch