long vhost_dev_set_owner()

in vhost.c [583:628]

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

long vhost_dev_set_owner(struct vhost_dev *dev)
{
	struct task_struct *worker;
	int err;

	/* Is there an owner already? */
	if (vhost_dev_has_owner(dev)) {
		err = -EBUSY;
		goto err_mm;
	}

	vhost_attach_mm(dev);

	dev->kcov_handle = kcov_common_handle();
	if (dev->use_worker) {
		worker = kthread_create(vhost_worker, dev,
					"vhost-%d", current->pid);
		if (IS_ERR(worker)) {
			err = PTR_ERR(worker);
			goto err_worker;
		}

		dev->worker = worker;
		wake_up_process(worker); /* avoid contributing to loadavg */

		err = vhost_attach_cgroups(dev);
		if (err)
			goto err_cgroup;
	}

	err = vhost_dev_alloc_iovecs(dev);
	if (err)
		goto err_cgroup;

	return 0;
err_cgroup:
	if (dev->worker) {
		kthread_stop(dev->worker);
		dev->worker = NULL;
	}
err_worker:
	vhost_detach_mm(dev);
	dev->kcov_handle = 0;
err_mm:
	return err;
}