static int pscsi_configure_device()

in target_core_pscsi.c [424:542]

• 92 lines of code
• 22 McCabe index (conditional complexity)

static int pscsi_configure_device(struct se_device *dev)
{
	struct se_hba *hba = dev->se_hba;
	struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
	struct scsi_device *sd;
	struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
	struct Scsi_Host *sh = phv->phv_lld_host;
	int legacy_mode_enable = 0;
	int ret;

	if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
	    !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
	    !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
		pr_err("Missing scsi_channel_id=, scsi_target_id= and"
			" scsi_lun_id= parameters\n");
		return -EINVAL;
	}

	/*
	 * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
	 * struct Scsi_Host we will need to bring the TCM/pSCSI object online
	 */
	if (!sh) {
		if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
			pr_err("pSCSI: Unable to locate struct"
				" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
			return -ENODEV;
		}
		/*
		 * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
		 * reference, we enforce that udev_path has been set
		 */
		if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
			pr_err("pSCSI: udev_path attribute has not"
				" been set before ENABLE=1\n");
			return -EINVAL;
		}
		/*
		 * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
		 * use the original TCM hba ID to reference Linux/SCSI Host No
		 * and enable for PHV_LLD_SCSI_HOST_NO mode.
		 */
		if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
			if (hba->dev_count) {
				pr_err("pSCSI: Unable to set hba_mode"
					" with active devices\n");
				return -EEXIST;
			}

			if (pscsi_pmode_enable_hba(hba, 1) != 1)
				return -ENODEV;

			legacy_mode_enable = 1;
			hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
			sh = phv->phv_lld_host;
		} else {
			sh = scsi_host_lookup(pdv->pdv_host_id);
			if (!sh) {
				pr_err("pSCSI: Unable to locate"
					" pdv_host_id: %d\n", pdv->pdv_host_id);
				return -EINVAL;
			}
			pdv->pdv_lld_host = sh;
		}
	} else {
		if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
			pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
				" struct Scsi_Host exists\n");
			return -EEXIST;
		}
	}

	spin_lock_irq(sh->host_lock);
	list_for_each_entry(sd, &sh->__devices, siblings) {
		if ((pdv->pdv_channel_id != sd->channel) ||
		    (pdv->pdv_target_id != sd->id) ||
		    (pdv->pdv_lun_id != sd->lun))
			continue;
		/*
		 * Functions will release the held struct scsi_host->host_lock
		 * before calling calling pscsi_add_device_to_list() to register
		 * struct scsi_device with target_core_mod.
		 */
		switch (sd->type) {
		case TYPE_DISK:
		case TYPE_ZBC:
			ret = pscsi_create_type_disk(dev, sd);
			break;
		default:
			ret = pscsi_create_type_nondisk(dev, sd);
			break;
		}

		if (ret) {
			if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
				scsi_host_put(sh);
			else if (legacy_mode_enable) {
				pscsi_pmode_enable_hba(hba, 0);
				hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
			}
			pdv->pdv_sd = NULL;
			return ret;
		}
		return 0;
	}
	spin_unlock_irq(sh->host_lock);

	pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
		pdv->pdv_channel_id,  pdv->pdv_target_id, pdv->pdv_lun_id);

	if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
		scsi_host_put(sh);
	else if (legacy_mode_enable) {
		pscsi_pmode_enable_hba(hba, 0);
		hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
	}

	return -ENODEV;
}