spin_lock(&obd->obd_dev_lock);
list_splice_init(&obd->obd_exports, &work_list);
list_splice_init(&obd->obd_delayed_exports, &work_list);
spin_lock(&obd->obd_dev_lock);
list_splice_init(&obd->obd_exports, &work_list);
list_splice_init(&obd->obd_delayed_exports, &work_list);