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Message-ID: <20200525112409.GA3208393@kuha.fi.intel.com>
Date: Mon, 25 May 2020 14:24:09 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, linux@...ck-us.net,
Naresh Kamboju <naresh.kamboju@...aro.org>,
kernel test robot <rong.a.chen@...el.com>,
stable <stable@...r.kernel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Brendan Higgins <brendanhiggins@...gle.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Petr Mladek <pmladek@...e.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Randy Dunlap <rdunlap@...radead.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 1/2] software node: implement software_node_unregister()
On Sun, May 24, 2020 at 05:30:40PM +0200, Greg Kroah-Hartman wrote:
> Sometimes it is better to unregister individual nodes instead of trying
> to do them all at once with software_node_unregister_nodes(), so create
> software_node_unregister() so that you can unregister them one at a
> time.
>
> This is especially important when creating nodes in a hierarchy, with
> parent -> children representations. Children always need to be removed
> before a parent is, as the swnode logic assumes this is going to be the
> case.
>
> Fix up the lib/test_printf.c fwnode_pointer() test which to use this new
> function as it had the problem of tearing things down in the backwards
> order.
>
> Fixes: f1ce39df508d ("lib/test_printf: Add tests for %pfw printk modifier")
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> Reported-by: kernel test robot <rong.a.chen@...el.com>
> Cc: stable <stable@...r.kernel.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Brendan Higgins <brendanhiggins@...gle.com>
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Petr Mladek <pmladek@...e.com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
FWIW:
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/base/swnode.c | 27 +++++++++++++++++++++------
> include/linux/property.h | 1 +
> lib/test_printf.c | 4 +++-
> 3 files changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index de8d3543e8fe..770b1f47a625 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -712,17 +712,18 @@ EXPORT_SYMBOL_GPL(software_node_register_nodes);
> * @nodes: Zero terminated array of software nodes to be unregistered
> *
> * 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.
> */
> void software_node_unregister_nodes(const struct software_node *nodes)
> {
> - struct swnode *swnode;
> int i;
>
> - for (i = 0; nodes[i].name; i++) {
> - swnode = software_node_to_swnode(&nodes[i]);
> - if (swnode)
> - fwnode_remove_software_node(&swnode->fwnode);
> - }
> + for (i = 0; nodes[i].name; i++)
> + software_node_unregister(&nodes[i]);
> }
> EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
>
> @@ -741,6 +742,20 @@ int software_node_register(const struct software_node *node)
> }
> EXPORT_SYMBOL_GPL(software_node_register);
>
> +/**
> + * software_node_unregister - Unregister static software node
> + * @node: The software node to be unregistered
> + */
> +void software_node_unregister(const struct software_node *node)
> +{
> + struct swnode *swnode;
> +
> + swnode = software_node_to_swnode(node);
> + if (swnode)
> + fwnode_remove_software_node(&swnode->fwnode);
> +}
> +EXPORT_SYMBOL_GPL(software_node_unregister);
> +
> struct fwnode_handle *
> fwnode_create_software_node(const struct property_entry *properties,
> const struct fwnode_handle *parent)
> diff --git a/include/linux/property.h b/include/linux/property.h
> index d86de017c689..0d4099b4ce1f 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -441,6 +441,7 @@ int software_node_register_nodes(const struct software_node *nodes);
> void software_node_unregister_nodes(const struct software_node *nodes);
>
> int software_node_register(const struct software_node *node);
> +void software_node_unregister(const struct software_node *node);
>
> int software_node_notify(struct device *dev, unsigned long action);
>
> diff --git a/lib/test_printf.c b/lib/test_printf.c
> index 6b1622f4d7c2..fc63b8959d42 100644
> --- a/lib/test_printf.c
> +++ b/lib/test_printf.c
> @@ -637,7 +637,9 @@ static void __init fwnode_pointer(void)
> test(second_name, "%pfwP", software_node_fwnode(&softnodes[1]));
> test(third_name, "%pfwP", software_node_fwnode(&softnodes[2]));
>
> - software_node_unregister_nodes(softnodes);
> + software_node_unregister(&softnodes[2]);
> + software_node_unregister(&softnodes[1]);
> + software_node_unregister(&softnodes[0]);
> }
>
> static void __init
> --
> 2.26.2
thanks,
--
heikki
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