static int really_probe()

in dd.c [541:679]

• 109 lines of code
• 28 McCabe index (conditional complexity)

static int really_probe(struct device *dev, struct device_driver *drv)
{
	bool test_remove = IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
			   !drv->suppress_bind_attrs;
	int ret;

	if (defer_all_probes) {
		/*
		 * Value of defer_all_probes can be set only by
		 * device_block_probing() which, in turn, will call
		 * wait_for_device_probe() right after that to avoid any races.
		 */
		dev_dbg(dev, "Driver %s force probe deferral\n", drv->name);
		return -EPROBE_DEFER;
	}

	ret = device_links_check_suppliers(dev);
	if (ret)
		return ret;

	pr_debug("bus: '%s': %s: probing driver %s with device %s\n",
		 drv->bus->name, __func__, drv->name, dev_name(dev));
	if (!list_empty(&dev->devres_head)) {
		dev_crit(dev, "Resources present before probing\n");
		ret = -EBUSY;
		goto done;
	}

re_probe:
	dev->driver = drv;

	/* If using pinctrl, bind pins now before probing */
	ret = pinctrl_bind_pins(dev);
	if (ret)
		goto pinctrl_bind_failed;

	if (dev->bus->dma_configure) {
		ret = dev->bus->dma_configure(dev);
		if (ret)
			goto pinctrl_bind_failed;
	}

	ret = driver_sysfs_add(dev);
	if (ret) {
		pr_err("%s: driver_sysfs_add(%s) failed\n",
		       __func__, dev_name(dev));
		goto sysfs_failed;
	}

	if (dev->pm_domain && dev->pm_domain->activate) {
		ret = dev->pm_domain->activate(dev);
		if (ret)
			goto probe_failed;
	}

	ret = call_driver_probe(dev, drv);
	if (ret) {
		/*
		 * Return probe errors as positive values so that the callers
		 * can distinguish them from other errors.
		 */
		ret = -ret;
		goto probe_failed;
	}

	ret = device_add_groups(dev, drv->dev_groups);
	if (ret) {
		dev_err(dev, "device_add_groups() failed\n");
		goto dev_groups_failed;
	}

	if (dev_has_sync_state(dev)) {
		ret = device_create_file(dev, &dev_attr_state_synced);
		if (ret) {
			dev_err(dev, "state_synced sysfs add failed\n");
			goto dev_sysfs_state_synced_failed;
		}
	}

	if (test_remove) {
		test_remove = false;

		device_remove_file(dev, &dev_attr_state_synced);
		device_remove_groups(dev, drv->dev_groups);

		if (dev->bus->remove)
			dev->bus->remove(dev);
		else if (drv->remove)
			drv->remove(dev);

		devres_release_all(dev);
		driver_sysfs_remove(dev);
		dev->driver = NULL;
		dev_set_drvdata(dev, NULL);
		if (dev->pm_domain && dev->pm_domain->dismiss)
			dev->pm_domain->dismiss(dev);
		pm_runtime_reinit(dev);

		goto re_probe;
	}

	pinctrl_init_done(dev);

	if (dev->pm_domain && dev->pm_domain->sync)
		dev->pm_domain->sync(dev);

	driver_bound(dev);
	pr_debug("bus: '%s': %s: bound device %s to driver %s\n",
		 drv->bus->name, __func__, dev_name(dev), drv->name);
	goto done;

dev_sysfs_state_synced_failed:
	device_remove_groups(dev, drv->dev_groups);
dev_groups_failed:
	if (dev->bus->remove)
		dev->bus->remove(dev);
	else if (drv->remove)
		drv->remove(dev);
probe_failed:
	driver_sysfs_remove(dev);
sysfs_failed:
	if (dev->bus)
		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
					     BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
pinctrl_bind_failed:
	device_links_no_driver(dev);
	devres_release_all(dev);
	arch_teardown_dma_ops(dev);
	kfree(dev->dma_range_map);
	dev->dma_range_map = NULL;
	dev->driver = NULL;
	dev_set_drvdata(dev, NULL);
	if (dev->pm_domain && dev->pm_domain->dismiss)
		dev->pm_domain->dismiss(dev);
	pm_runtime_reinit(dev);
	dev_pm_set_driver_flags(dev, 0);
done:
	return ret;
}