static int vp_vdpa_request_irq()

in virtio_pci/vp_vdpa.c [144:196]

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

static int vp_vdpa_request_irq(struct vp_vdpa *vp_vdpa)
{
	struct virtio_pci_modern_device *mdev = &vp_vdpa->mdev;
	struct pci_dev *pdev = mdev->pci_dev;
	int i, ret, irq;
	int queues = vp_vdpa->queues;
	int vectors = queues + 1;

	ret = pci_alloc_irq_vectors(pdev, vectors, vectors, PCI_IRQ_MSIX);
	if (ret != vectors) {
		dev_err(&pdev->dev,
			"vp_vdpa: fail to allocate irq vectors want %d but %d\n",
			vectors, ret);
		return ret;
	}

	vp_vdpa->vectors = vectors;

	for (i = 0; i < queues; i++) {
		snprintf(vp_vdpa->vring[i].msix_name, VP_VDPA_NAME_SIZE,
			"vp-vdpa[%s]-%d\n", pci_name(pdev), i);
		irq = pci_irq_vector(pdev, i);
		ret = devm_request_irq(&pdev->dev, irq,
				       vp_vdpa_vq_handler,
				       0, vp_vdpa->vring[i].msix_name,
				       &vp_vdpa->vring[i]);
		if (ret) {
			dev_err(&pdev->dev,
				"vp_vdpa: fail to request irq for vq %d\n", i);
			goto err;
		}
		vp_modern_queue_vector(mdev, i, i);
		vp_vdpa->vring[i].irq = irq;
	}

	snprintf(vp_vdpa->msix_name, VP_VDPA_NAME_SIZE, "vp-vdpa[%s]-config\n",
		 pci_name(pdev));
	irq = pci_irq_vector(pdev, queues);
	ret = devm_request_irq(&pdev->dev, irq,	vp_vdpa_config_handler, 0,
			       vp_vdpa->msix_name, vp_vdpa);
	if (ret) {
		dev_err(&pdev->dev,
			"vp_vdpa: fail to request irq for vq %d\n", i);
			goto err;
	}
	vp_modern_config_vector(mdev, queues);
	vp_vdpa->config_irq = irq;

	return 0;
err:
	vp_vdpa_free_irq(vp_vdpa);
	return ret;
}