int sas_smp_phy_control(struct domain_device *dev, int phy_id,
			enum phy_func phy_func,
			struct sas_phy_linkrates *rates)
{
	u8 *pc_req;
	u8 *pc_resp;
	int res;

	pc_req = alloc_smp_req(PC_REQ_SIZE);
	if (!pc_req)
		return -ENOMEM;

	pc_resp = alloc_smp_resp(PC_RESP_SIZE);
	if (!pc_resp) {
		kfree(pc_req);
		return -ENOMEM;
	}

	pc_req[1] = SMP_PHY_CONTROL;
	pc_req[9] = phy_id;
	pc_req[10]= phy_func;
	if (rates) {
		pc_req[32] = rates->minimum_linkrate << 4;
		pc_req[33] = rates->maximum_linkrate << 4;
	}

	res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);

	kfree(pc_resp);
	kfree(pc_req);
	return res;
}

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