linux-kernel - Re: [PATCH 05/18] software_node: Alter software_node_unregister_nodes() to unregister the array in reverse order

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Message-ID: <20201130174542.GQ4077@smile.fi.intel.com>
Date:   Mon, 30 Nov 2020 19:45:42 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
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        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH 05/18] software_node: Alter
 software_node_unregister_nodes() to unregister the array in reverse order

On Mon, Nov 30, 2020 at 01:31:16PM +0000, Daniel Scally wrote:
> Software nodes that are children of another software node should be
> unregistered before their parent. To allow easy unregistering of an array
> of software_nodes ordered parent to child, reverse the order in which
> this function unregisters software_nodes.

Should be folded in the previous patch. Otherwise we will have a history point
where register() behaves differently to unregister().

...

> + * @nodes: Zero terminated array of software nodes to be unregistered. 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.

Please, leave field description short. Rather add another note to the
Description below.

>   *
>   * Unregister multiple software nodes at once.
>   *
> - * NOTE: Be careful using this call if the nodes had parent pointers set up in
> - * them before registering.  If so, it is wiser to remove the nodes
> - * individually, in the correct order (child before parent) instead of relying
> - * on the sequential order of the list of nodes in the array.
> + * NOTE: If you are uncertain whether the array is ordered such that
> + * parents will be unregistered before their children, it is wiser to
> + * remove the nodes individually, in the correct order (child before
> + * parent).
>   */

-- 
With Best Regards,
Andy Shevchenko