static int vu_find_vqs()

in drivers/virtio_uml.c [998:1049]

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

static int vu_find_vqs(struct virtio_device *vdev, unsigned nvqs,
		       struct virtqueue *vqs[], vq_callback_t *callbacks[],
		       const char * const names[], const bool *ctx,
		       struct irq_affinity *desc)
{
	struct virtio_uml_device *vu_dev = to_virtio_uml_device(vdev);
	int i, queue_idx = 0, rc;
	struct virtqueue *vq;

	/* not supported for now */
	if (WARN_ON(nvqs > 64))
		return -EINVAL;

	rc = vhost_user_set_mem_table(vu_dev);
	if (rc)
		return rc;

	for (i = 0; i < nvqs; ++i) {
		if (!names[i]) {
			vqs[i] = NULL;
			continue;
		}

		vqs[i] = vu_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
				     ctx ? ctx[i] : false);
		if (IS_ERR(vqs[i])) {
			rc = PTR_ERR(vqs[i]);
			goto error_setup;
		}
	}

	list_for_each_entry(vq, &vdev->vqs, list) {
		struct virtio_uml_vq_info *info = vq->priv;

		if (info->kick_fd >= 0) {
			rc = vhost_user_set_vring_kick(vu_dev, vq->index,
						       info->kick_fd);
			if (rc)
				goto error_setup;
		}

		rc = vhost_user_set_vring_enable(vu_dev, vq->index, true);
		if (rc)
			goto error_setup;
	}

	return 0;

error_setup:
	vu_del_vqs(vdev);
	return rc;
}