cfs_list_del_init(&exp->exp_obd_chain);
cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
cfs_spin_lock(&obd_zombie_impexp_lock);
cfs_list_del_init(&exp->exp_obd_chain);
cfs_spin_unlock(&exp->exp_obd->obd_dev_lock);
cfs_spin_lock(&obd_zombie_impexp_lock);