ocs_atomic_sub_return
ocs_atomic_sub_return(&hw->rpi_ref[rnode->index].rpi_count, 1);
count = ocs_atomic_sub_return(&hw->rpi_ref[index].rpi_count, 1);
ocs_atomic_sub_return(&hw->rpi_ref[rnode->index].rpi_count, 1);
ocs_atomic_sub_return(&ocs->xport->io_active_count, 1);
if (ocs_atomic_sub_return(&ref->count, 1) == 1) {
ocs_atomic_sub_return(&xport->io_pending_recursing, 1);
ocs_atomic_sub_return(&xport->io_pending_count, 1);
ocs_atomic_sub_return(&xport->io_pending_count, 1);
ocs_atomic_sub_return(&xport->io_pending_recursing, 1);