static int ifcvf_request_irq()

in ifcvf/ifcvf_main.c [61:111]

• 43 lines of code
• 5 McCabe index (conditional complexity)

static int ifcvf_request_irq(struct ifcvf_adapter *adapter)
{
	struct pci_dev *pdev = adapter->pdev;
	struct ifcvf_hw *vf = &adapter->vf;
	int vector, i, ret, irq;
	u16 max_intr;

	/* all queues and config interrupt  */
	max_intr = vf->nr_vring + 1;

	ret = pci_alloc_irq_vectors(pdev, max_intr,
				    max_intr, PCI_IRQ_MSIX);
	if (ret < 0) {
		IFCVF_ERR(pdev, "Failed to alloc IRQ vectors\n");
		return ret;
	}

	snprintf(vf->config_msix_name, 256, "ifcvf[%s]-config\n",
		 pci_name(pdev));
	vector = 0;
	vf->config_irq = pci_irq_vector(pdev, vector);
	ret = devm_request_irq(&pdev->dev, vf->config_irq,
			       ifcvf_config_changed, 0,
			       vf->config_msix_name, vf);
	if (ret) {
		IFCVF_ERR(pdev, "Failed to request config irq\n");
		return ret;
	}

	for (i = 0; i < vf->nr_vring; i++) {
		snprintf(vf->vring[i].msix_name, 256, "ifcvf[%s]-%d\n",
			 pci_name(pdev), i);
		vector = i + IFCVF_MSI_QUEUE_OFF;
		irq = pci_irq_vector(pdev, vector);
		ret = devm_request_irq(&pdev->dev, irq,
				       ifcvf_intr_handler, 0,
				       vf->vring[i].msix_name,
				       &vf->vring[i]);
		if (ret) {
			IFCVF_ERR(pdev,
				  "Failed to request irq for vq %d\n", i);
			ifcvf_free_irq(adapter, i);

			return ret;
		}

		vf->vring[i].irq = irq;
	}

	return 0;
}