linux-kernel - Re: [PATCH v1 1/1] device property: Sync descriptions of swnode array and group APIs

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Date:   Mon, 8 Mar 2021 13:32:06 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v1 1/1] device property: Sync descriptions of swnode
 array and group APIs

On Mon, Mar 08, 2021 at 12:36:44PM +0200, Andy Shevchenko wrote:
> After a few updates against swnode APIs the kernel documentation, i.e.
> for swnode group registration and unregistration deviates from the one
> for swnode array. In general, the same rules are applied to both.
> Hence, synchronize descriptions of swnode array and group APIs
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/base/swnode.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index 37179a8b1ceb..46c48d602915 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -880,7 +880,11 @@ EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
>   * software_node_register_node_group - Register a group of software nodes
>   * @node_group: NULL terminated array of software node pointers to be registered
>   *
> - * Register multiple software nodes at once.
> + * Register multiple software nodes at once. If any node in the array
> + * has its .parent pointer set (which can only be to another software_node),
> + * then its parent **must** have been registered before it is; either outside
> + * of this function or by ordering the array such that parent comes before
> + * child.
>   */
>  int software_node_register_node_group(const struct software_node **node_group)
>  {
> @@ -906,10 +910,14 @@ EXPORT_SYMBOL_GPL(software_node_register_node_group);
>   * software_node_unregister_node_group - Unregister a group of software nodes
>   * @node_group: NULL terminated array of software node pointers to be unregistered
>   *
> - * Unregister multiple software nodes at once. The array will be unwound in
> - * reverse order (i.e. last entry first) and thus if any members of the array are
> - * children of another member then the children must appear later in the list such
> - * that they are unregistered first.
> + * 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.
> + *
> + * 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).
>   */
>  void software_node_unregister_node_group(
>  		const struct software_node **node_group)
> -- 
> 2.30.1

-- 
heikki