static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
{
	enum sas_device_type dev_type;
	enum sas_linkrate linkrate;
	u8 sas_addr[SAS_ADDR_SIZE];
	struct smp_resp *resp = rsp;
	struct discover_resp *dr = &resp->disc;
	struct sas_ha_struct *ha = dev->port->ha;
	struct expander_device *ex = &dev->ex_dev;
	struct ex_phy *phy = &ex->ex_phy[phy_id];
	struct sas_rphy *rphy = dev->rphy;
	bool new_phy = !phy->phy;
	char *type;

	if (new_phy) {
		if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
			return;
		phy->phy = sas_phy_alloc(&rphy->dev, phy_id);

		/* FIXME: error_handling */
		BUG_ON(!phy->phy);
	}

	switch (resp->result) {
	case SMP_RESP_PHY_VACANT:
		phy->phy_state = PHY_VACANT;
		break;
	default:
		phy->phy_state = PHY_NOT_PRESENT;
		break;
	case SMP_RESP_FUNC_ACC:
		phy->phy_state = PHY_EMPTY; /* do not know yet */
		break;
	}

	/* check if anything important changed to squelch debug */
	dev_type = phy->attached_dev_type;
	linkrate  = phy->linkrate;
	memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);

	/* Handle vacant phy - rest of dr data is not valid so skip it */
	if (phy->phy_state == PHY_VACANT) {
		memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
		phy->attached_dev_type = SAS_PHY_UNUSED;
		if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
			phy->phy_id = phy_id;
			goto skip;
		} else
			goto out;
	}

	phy->attached_dev_type = to_dev_type(dr);
	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
		goto out;
	phy->phy_id = phy_id;
	phy->linkrate = dr->linkrate;
	phy->attached_sata_host = dr->attached_sata_host;
	phy->attached_sata_dev  = dr->attached_sata_dev;
	phy->attached_sata_ps   = dr->attached_sata_ps;
	phy->attached_iproto = dr->iproto << 1;
	phy->attached_tproto = dr->tproto << 1;
	/* help some expanders that fail to zero sas_address in the 'no
	 * device' case
	 */
	if (phy->attached_dev_type == SAS_PHY_UNUSED ||
	    phy->linkrate < SAS_LINK_RATE_1_5_GBPS)
		memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
	else
		memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
	phy->attached_phy_id = dr->attached_phy_id;
	phy->phy_change_count = dr->change_count;
	phy->routing_attr = dr->routing_attr;
	phy->virtual = dr->virtual;
	phy->last_da_index = -1;

	phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
	phy->phy->identify.device_type = dr->attached_dev_type;
	phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
	phy->phy->identify.target_port_protocols = phy->attached_tproto;
	if (!phy->attached_tproto && dr->attached_sata_dev)
		phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
	phy->phy->identify.phy_identifier = phy_id;
	phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
	phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
	phy->phy->minimum_linkrate = dr->pmin_linkrate;
	phy->phy->maximum_linkrate = dr->pmax_linkrate;
	phy->phy->negotiated_linkrate = phy->linkrate;

 skip:
	if (new_phy)
		if (sas_phy_add(phy->phy)) {
			sas_phy_free(phy->phy);
			return;
		}

 out:
	switch (phy->attached_dev_type) {
	case SAS_SATA_PENDING:
		type = "stp pending";
		break;
	case SAS_PHY_UNUSED:
		type = "no device";
		break;
	case SAS_END_DEVICE:
		if (phy->attached_iproto) {
			if (phy->attached_tproto)
				type = "host+target";
			else
				type = "host";
		} else {
			if (dr->attached_sata_dev)
				type = "stp";
			else
				type = "ssp";
		}
		break;
	case SAS_EDGE_EXPANDER_DEVICE:
	case SAS_FANOUT_EXPANDER_DEVICE:
		type = "smp";
		break;
	default:
		type = "unknown";
	}

	/* this routine is polled by libata error recovery so filter
	 * unimportant messages
	 */
	if (new_phy || phy->attached_dev_type != dev_type ||
	    phy->linkrate != linkrate ||
	    SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
		/* pass */;
	else
		return;

	/* if the attached device type changed and ata_eh is active,
	 * make sure we run revalidation when eh completes (see:
	 * sas_enable_revalidation)
	 */
	if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
		set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);

	SAS_DPRINTK("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
		    test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
		    SAS_ADDR(dev->sas_addr), phy->phy_id,
		    sas_route_char(dev, phy), phy->linkrate,
		    SAS_ADDR(phy->attached_sas_addr), type);
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.