static int vhost_vsock_start()

in vsock.c [576:630]

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

static int vhost_vsock_start(struct vhost_vsock *vsock)
{
	struct vhost_virtqueue *vq;
	size_t i;
	int ret;

	mutex_lock(&vsock->dev.mutex);

	ret = vhost_dev_check_owner(&vsock->dev);
	if (ret)
		goto err;

	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
		vq = &vsock->vqs[i];

		mutex_lock(&vq->mutex);

		if (!vhost_vq_access_ok(vq)) {
			ret = -EFAULT;
			goto err_vq;
		}

		if (!vhost_vq_get_backend(vq)) {
			vhost_vq_set_backend(vq, vsock);
			ret = vhost_vq_init_access(vq);
			if (ret)
				goto err_vq;
		}

		mutex_unlock(&vq->mutex);
	}

	/* Some packets may have been queued before the device was started,
	 * let's kick the send worker to send them.
	 */
	vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);

	mutex_unlock(&vsock->dev.mutex);
	return 0;

err_vq:
	vhost_vq_set_backend(vq, NULL);
	mutex_unlock(&vq->mutex);

	for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
		vq = &vsock->vqs[i];

		mutex_lock(&vq->mutex);
		vhost_vq_set_backend(vq, NULL);
		mutex_unlock(&vq->mutex);
	}
err:
	mutex_unlock(&vsock->dev.mutex);
	return ret;
}