Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: VFI9a2jaQ1qkLsL4ay+s+CIPEYmoLu57QZ61C9EKfWPAv+VQs9X3AlBCyaloENj/jCkPk5sWF6
 XgZnLhaVIrFg==
IronPort-SDR: xKJUjQ8laE51Ag27+DBSeh0uh0HukOeHAEfSp51gl9McS9F+Dcgy9QWC1bmPWGjS3LXy8cShle
 kv0Rpm1rzH7Q==
Date:   Mon, 30 Nov 2020 19:35:30 +0200
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     Daniel Scally <djrscally@gmail.com>
Cc:     linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org,
        linux-media@vger.kernel.org, devel@acpica.org, rjw@rjwysocki.net,
        lenb@kernel.org, gregkh@linuxfoundation.org,
        mika.westerberg@linux.intel.com, linus.walleij@linaro.org,
        bgolaszewski@baylibre.com, wsa@kernel.org, yong.zhi@intel.com,
        sakari.ailus@linux.intel.com, bingbu.cao@intel.com,
        tian.shu.qiu@intel.com, mchehab@kernel.org, robert.moore@intel.com,
        erik.kaneda@intel.com, pmladek@suse.com, rostedt@goodmis.org,
        sergey.senozhatsky@gmail.com, linux@rasmusvillemoes.dk,
        kieran.bingham+renesas@ideasonboard.com, jacopo+renesas@jmondi.org,
        laurent.pinchart+renesas@ideasonboard.com,
        jorhand@linux.microsoft.com, kitakar@gmail.com,
        heikki.krogerus@linux.intel.com
Subject: Re: [PATCH 04/18] software_node: Enforce parent before child
 ordering of nodes array for software_node_register_nodes()
Message-ID: <20201130173530.GO4077@smile.fi.intel.com>
References: <20201130133129.1024662-1-djrscally@gmail.com>
 <20201130133129.1024662-5-djrscally@gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20201130133129.1024662-5-djrscally@gmail.com>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
Precedence: bulk

On Mon, Nov 30, 2020 at 01:31:15PM +0000, Daniel Scally wrote:
> Registering software_nodes with the .parent member set to point to a
> currently unregistered software_node has the potential for problems,
> so enforce parent -> child ordering in arrays passed to this function.

I agree with Laurent.

...

>  	for (i = 0; nodes[i].name; i++) {
> +		if (nodes[i].parent)
> +			if (!software_node_to_swnode(nodes[i].parent)) {
> +				ret = -EINVAL;
> +				goto err_unregister_nodes;
> +			}
> +

Besides that can we pack these conditionals together?

		if (nodes[i].parent && !software_node_to_swnode(nodes[i].parent)) {


Do we have sane ordering in software_node_unregister_nodes()?

-- 
With Best Regards,
Andy Shevchenko