static int ntb_epf_init_isr()

in hw/epf/ntb_hw_epf.c [330:379]

• 42 lines of code
• 7 McCabe index (conditional complexity)

static int ntb_epf_init_isr(struct ntb_epf_dev *ndev, int msi_min, int msi_max)
{
	struct pci_dev *pdev = ndev->ntb.pdev;
	struct device *dev = ndev->dev;
	u32 argument = MSIX_ENABLE;
	int irq;
	int ret;
	int i;

	irq = pci_alloc_irq_vectors(pdev, msi_min, msi_max, PCI_IRQ_MSIX);
	if (irq < 0) {
		dev_dbg(dev, "Failed to get MSIX interrupts\n");
		irq = pci_alloc_irq_vectors(pdev, msi_min, msi_max,
					    PCI_IRQ_MSI);
		if (irq < 0) {
			dev_err(dev, "Failed to get MSI interrupts\n");
			return irq;
		}
		argument &= ~MSIX_ENABLE;
	}

	for (i = 0; i < irq; i++) {
		ret = request_irq(pci_irq_vector(pdev, i), ntb_epf_vec_isr,
				  0, "ntb_epf", ndev);
		if (ret) {
			dev_err(dev, "Failed to request irq\n");
			goto err_request_irq;
		}
	}

	ndev->db_count = irq - 1;

	ret = ntb_epf_send_command(ndev, CMD_CONFIGURE_DOORBELL,
				   argument | irq);
	if (ret) {
		dev_err(dev, "Failed to configure doorbell\n");
		goto err_configure_db;
	}

	return 0;

err_configure_db:
	for (i = 0; i < ndev->db_count + 1; i++)
		free_irq(pci_irq_vector(pdev, i), ndev);

err_request_irq:
	pci_free_irq_vectors(pdev);

	return ret;
}