linux-kernel - Re: [RFC PATCH v3 1/9] software_node: Add helper function to unregister arrays of software

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Date:   Tue, 20 Oct 2020 14:02:36 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Daniel Scally <djrscally@...il.com>, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux.walleij@...aro.org,
        prabhakar.mahadev-lad.rj@...renesas.com,
        heikki.krogerus@...ux.intel.com, dmitry.torokhov@...il.com,
        laurent.pinchart+renesas@...asonboard.com,
        kieran.bingham+renesas@...asonboard.com, jacopo+renesas@...ndi.org,
        robh@...nel.org, davem@...emloft.net, linux@...musvillemoes.dk,
        sergey.senozhatsky@...il.com, rostedt@...dmis.org,
        pmladek@...e.com, mchehab@...nel.org, tian.shu.qiu@...el.com,
        bingbu.cao@...el.com, yong.zhi@...el.com, rafael@...nel.org,
        gregkh@...uxfoundation.org, kitakar@...il.com,
        dan.carpenter@...cle.org
Subject: Re: [RFC PATCH v3 1/9] software_node: Add helper function to
 unregister arrays of software_nodes ordered parent to child

On Tue, Oct 20, 2020 at 02:01:55PM +0300, Andy Shevchenko wrote:
> On Tue, Oct 20, 2020 at 01:05:10PM +0300, Sakari Ailus wrote:
> > On Mon, Oct 19, 2020 at 11:58:55PM +0100, 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, add a helper function to loop
> > > over and unregister nodes in such an array in reverse order.
> 
> ...
> 
> > > + * software_node_unregister_nodes_reverse - Unregister an array of software
> > > + * nodes in reverse order.
> > > + * @nodes: Array of software nodes to be unregistered.
> > > + *
> > > + * NOTE: The same warning applies as with software_node_unregister_nodes.
> > > + * Unless you are _sure_ that the array of nodes is ordered parent to child
> > > + * it is wiser to remove them individually in the correct order.
> > 
> > Could the default order in software_node_unregister_nodes() be reversed
> > instead? There are no users so this should be easy to change.
> > 
> > Doing this only one way may require enforcing the registration order in
> > software_node_register_nodes(), but the end result would be safer.
> > 
> > What do you think?
> 
> Will work for me (I would also hear Heikki).
> 
> But in such case let's change the order of
> software_node_unregister_node_group() for the sake of consistency.

But either way we will need a note to describe the ordering.

-- 
With Best Regards,
Andy Shevchenko