linux-kernel - Re: [PATCH 04/18] software_node: Enforce parent before child ordering of nodes array for software_node_register

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Message-ID: <3f2edde6-e2e3-b379-3c1b-2a5461034b8a@gmail.com>
Date:   Mon, 30 Nov 2020 23:10:05 +0000
From:   Dan Scally <djrscally@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...ica.org, rjw@...ysocki.net,
        lenb@...nel.org, gregkh@...uxfoundation.org,
        mika.westerberg@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        wsa@...nel.org, yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        robert.moore@...el.com, erik.kaneda@...el.com, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com,
        linux@...musvillemoes.dk, kieran.bingham+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org,
        laurent.pinchart+renesas@...asonboard.com,
        jorhand@...ux.microsoft.com, kitakar@...il.com,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH 04/18] software_node: Enforce parent before child ordering
 of nodes array for software_node_register_nodes()

Hi Laurent

On 30/11/2020 16:12, Laurent Pinchart wrote:
> On Mon, Nov 30, 2020 at 06:11:52PM +0200, Laurent Pinchart wrote:
>> Hi Daniel,
>>
>> Thank you for the patch.
>>
>> 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.
>>>
>>> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>>> Signed-off-by: Daniel Scally <djrscally@...il.com>
>>> ---
>>> Changes since RFC v3:
>>>
>>> 	Patch introduced
>>>
>>>  drivers/base/swnode.c | 15 +++++++++++----
>>>  1 file changed, 11 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
>>> index 615a0c93e116..af7930b3679e 100644
>>> --- a/drivers/base/swnode.c
>>> +++ b/drivers/base/swnode.c
>>> @@ -700,14 +700,21 @@ int software_node_register_nodes(const struct software_node *nodes)
>>>  	int i;
>>>  
>>>  	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;
>>> +			}
>>> +
>>>  		ret = software_node_register(&nodes[i]);
>>> -		if (ret) {
>>> -			software_node_unregister_nodes(nodes);
>>> -			return ret;
>>> -		}
>>> +		if (ret)
>>> +			goto err_unregister_nodes;
>>>  	}
>>>  
>>>  	return 0;
>> I'd add a blank line here.
>>
>> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> I spoke a bit too soon. Could you update the documentation of the
> function to explain this new requirement ?
Oops - of course, will do
>>> +err_unregister_nodes:
>>> +	software_node_unregister_nodes(nodes);
>>> +	return ret;
>>>  }
>>>  EXPORT_SYMBOL_GPL(software_node_register_nodes);
>>>  
>> -- 
>> Regards,
>>
>> Laurent Pinchart