int gb_interface_enable()

in interface.c [1068:1174]

• 79 lines of code
• 12 McCabe index (conditional complexity)

int gb_interface_enable(struct gb_interface *intf)
{
	struct gb_control *control;
	struct gb_bundle *bundle, *tmp;
	int ret, size;
	void *manifest;

	ret = gb_interface_read_and_clear_init_status(intf);
	if (ret) {
		dev_err(&intf->dev, "failed to clear init status: %d\n", ret);
		return ret;
	}

	/* Establish control connection */
	control = gb_control_create(intf);
	if (IS_ERR(control)) {
		dev_err(&intf->dev, "failed to create control device: %ld\n",
			PTR_ERR(control));
		return PTR_ERR(control);
	}
	intf->control = control;

	ret = gb_control_enable(intf->control);
	if (ret)
		goto err_put_control;

	/* Get manifest size using control protocol on CPort */
	size = gb_control_get_manifest_size_operation(intf);
	if (size <= 0) {
		dev_err(&intf->dev, "failed to get manifest size: %d\n", size);

		if (size)
			ret = size;
		else
			ret =  -EINVAL;

		goto err_disable_control;
	}

	manifest = kmalloc(size, GFP_KERNEL);
	if (!manifest) {
		ret = -ENOMEM;
		goto err_disable_control;
	}

	/* Get manifest using control protocol on CPort */
	ret = gb_control_get_manifest_operation(intf, manifest, size);
	if (ret) {
		dev_err(&intf->dev, "failed to get manifest: %d\n", ret);
		goto err_free_manifest;
	}

	/*
	 * Parse the manifest and build up our data structures representing
	 * what's in it.
	 */
	if (!gb_manifest_parse(intf, manifest, size)) {
		dev_err(&intf->dev, "failed to parse manifest\n");
		ret = -EINVAL;
		goto err_destroy_bundles;
	}

	ret = gb_control_get_bundle_versions(intf->control);
	if (ret)
		goto err_destroy_bundles;

	/* Register the control device and any bundles */
	ret = gb_control_add(intf->control);
	if (ret)
		goto err_destroy_bundles;

	pm_runtime_use_autosuspend(&intf->dev);
	pm_runtime_get_noresume(&intf->dev);
	pm_runtime_set_active(&intf->dev);
	pm_runtime_enable(&intf->dev);

	list_for_each_entry_safe_reverse(bundle, tmp, &intf->bundles, links) {
		ret = gb_bundle_add(bundle);
		if (ret) {
			gb_bundle_destroy(bundle);
			continue;
		}
	}

	kfree(manifest);

	intf->enabled = true;

	pm_runtime_put(&intf->dev);

	trace_gb_interface_enable(intf);

	return 0;

err_destroy_bundles:
	list_for_each_entry_safe(bundle, tmp, &intf->bundles, links)
		gb_bundle_destroy(bundle);
err_free_manifest:
	kfree(manifest);
err_disable_control:
	gb_control_disable(intf->control);
err_put_control:
	gb_control_put(intf->control);
	intf->control = NULL;

	return ret;
}