On 5/24/20 8:30 AM, 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@linaro.org Reported-by: kernel test robot rong.a.chen@intel.com Cc: stable stable@vger.kernel.org Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Brendan Higgins brendanhiggins@google.com Cc: Dmitry Torokhov dmitry.torokhov@gmail.com Cc: Heikki Krogerus heikki.krogerus@linux.intel.com Cc: Petr Mladek pmladek@suse.com Cc: Rafael J. Wysocki rafael.j.wysocki@intel.com Cc: Randy Dunlap rdunlap@infradead.org Cc: Rasmus Villemoes linux@rasmusvillemoes.dk Cc: Sakari Ailus sakari.ailus@linux.intel.com Cc: Sergey Senozhatsky sergey.senozhatsky@gmail.com Cc: Steven Rostedt rostedt@goodmis.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

Reported-by: Randy Dunlap rdunlap@infradead.org Acked-by: Randy Dunlap rdunlap@infradead.org Tested-by: Randy Dunlap rdunlap@infradead.org

thanks.

---

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