QEDF_DRAIN_ACTIVE
if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {