From: Greg Kroah-Hartman gregkh@linuxfoundation.org
commit 46d26819a5056f4831649c5887ad5c71a16d86f7 upstream.
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") 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: Petr Mladek pmladek@suse.com Cc: Rafael J. Wysocki rafael.j.wysocki@intel.com 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 Reported-by: Naresh Kamboju naresh.kamboju@linaro.org Reported-by: kernel test robot rong.a.chen@intel.com Reported-by: Randy Dunlap rdunlap@infradead.org Tested-by: Petr Mladek pmladek@suse.com Tested-by: Randy Dunlap rdunlap@infradead.org Tested-by: Guenter Roeck linux@roeck-us.net Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com Acked-by: Randy Dunlap rdunlap@infradead.org Link: https://lore.kernel.org/r/20200524153041.2361-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/base/swnode.c | 27 +++++++++++++++++++++------ include/linux/property.h | 1 + lib/test_printf.c | 4 +++- 3 files changed, 25 insertions(+), 7 deletions(-)
--- a/drivers/base/swnode.c +++ b/drivers/base/swnode.c @@ -712,17 +712,18 @@ EXPORT_SYMBOL_GPL(software_node_register * @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 } 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) --- a/include/linux/property.h +++ b/include/linux/property.h @@ -441,6 +441,7 @@ int software_node_register_nodes(const s 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);
--- 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