static int ne_pci_probe()

in drivers/virt/nitro_enclaves/ne_pci_dev.c [466:552]

• 65 lines of code
• 8 McCabe index (conditional complexity)

static int ne_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct ne_pci_dev *ne_pci_dev = NULL;
	int rc = -EINVAL;

	ne_pci_dev = kzalloc(sizeof(*ne_pci_dev), GFP_KERNEL);
	if (!ne_pci_dev)
		return -ENOMEM;

	rc = pci_enable_device(pdev);
	if (rc < 0) {
		dev_err(&pdev->dev, "Error in pci dev enable [rc=%d]\n", rc);

		goto free_ne_pci_dev;
	}

	pci_set_master(pdev);

	rc = pci_request_regions_exclusive(pdev, "nitro_enclaves");
	if (rc < 0) {
		dev_err(&pdev->dev, "Error in pci request regions [rc=%d]\n", rc);

		goto disable_pci_dev;
	}

	ne_pci_dev->iomem_base = pci_iomap(pdev, PCI_BAR_NE, 0);
	if (!ne_pci_dev->iomem_base) {
		rc = -ENOMEM;

		dev_err(&pdev->dev, "Error in pci iomap [rc=%d]\n", rc);

		goto release_pci_regions;
	}

	pci_set_drvdata(pdev, ne_pci_dev);

	rc = ne_setup_msix(pdev);
	if (rc < 0) {
		dev_err(&pdev->dev, "Error in pci dev msix setup [rc=%d]\n", rc);

		goto iounmap_pci_bar;
	}

	ne_pci_dev_disable(pdev);

	rc = ne_pci_dev_enable(pdev);
	if (rc < 0) {
		dev_err(&pdev->dev, "Error in ne_pci_dev enable [rc=%d]\n", rc);

		goto teardown_msix;
	}

	atomic_set(&ne_pci_dev->cmd_reply_avail, 0);
	init_waitqueue_head(&ne_pci_dev->cmd_reply_wait_q);
	INIT_LIST_HEAD(&ne_pci_dev->enclaves_list);
	mutex_init(&ne_pci_dev->enclaves_list_mutex);
	mutex_init(&ne_pci_dev->pci_dev_mutex);
	ne_pci_dev->pdev = pdev;

	ne_devs.ne_pci_dev = ne_pci_dev;

	rc = misc_register(ne_devs.ne_misc_dev);
	if (rc < 0) {
		dev_err(&pdev->dev, "Error in misc dev register [rc=%d]\n", rc);

		goto disable_ne_pci_dev;
	}

	return 0;

disable_ne_pci_dev:
	ne_devs.ne_pci_dev = NULL;
	ne_pci_dev_disable(pdev);
teardown_msix:
	ne_teardown_msix(pdev);
iounmap_pci_bar:
	pci_set_drvdata(pdev, NULL);
	pci_iounmap(pdev, ne_pci_dev->iomem_base);
release_pci_regions:
	pci_release_regions(pdev);
disable_pci_dev:
	pci_disable_device(pdev);
free_ne_pci_dev:
	kfree(ne_pci_dev);

	return rc;
}