linux-kernel - Re: [PATCH v2 04/12] software_node: Enforce parent before child ordering of nodes arrays

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Date:   Sat, 19 Dec 2020 23:33:06 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...ica.org, rjw@...ysocki.net,
        lenb@...nel.org, gregkh@...uxfoundation.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,
        laurent.pinchart+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org, kieran.bingham+renesas@...asonboard.com,
        linus.walleij@...aro.org, heikki.krogerus@...ux.intel.com,
        kitakar@...il.com, jorhand@...ux.microsoft.com
Subject: Re: [PATCH v2 04/12] software_node: Enforce parent before child
 ordering of nodes arrays

On 18/12/2020 20:29, Andy Shevchenko wrote:
>> + * Register multiple software nodes at once. If any node in the array
>> + * has it's .parent pointer set, then it's parent **must** have been
> 
> it's => its in both cases?

Done, ty

>> + * registered before it is; either outside of this function or by
>> + * ordering the array such that parent comes before child.
>>   */
> 
> ...
> 
>> +		const struct software_node *parent = nodes[i].parent;
>> +
>> +		if (parent && !software_node_to_swnode(parent)) {
> 
> Can we have parent of swnode in an array not being an swnode?
> Either comment that parent for swnode can be swnode only (Heikki, was it an
> idea?) or check if parent is of swnode type and only that apply this
> requirement.

.parent can be a pointer to software_node only yes; I can add that to
the document comment.

>> +			ret = -EINVAL;
>> +			goto err_unregister_nodes;
>>  		}
> 
> ...
> 
>> + * Unregister multiple software nodes at once. If parent pointers are set up
>> + * in any of the software nodes then the array MUST be ordered such that
>> + * parents come before their children.
> 
> Shouldn't be consistent with above, i.e. **must** ?

Done also