linux-kernel - [PATCH 1/2] device property: introduce fwnode_for_each_available_child_node

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Message-Id: <20240522-fwnode_for_each_available_child_node_scoped-v1-1-1188b0da12dc@gmail.com>
Date: Wed, 22 May 2024 11:18:07 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Daniel Scally <djrscally@...il.com>, 
 Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>, 
 Antoniu Miclaus <antoniu.miclaus@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-hwmon@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 1/2] device property: introduce
 fwnode_for_each_available_child_node_scoped()

Add a scoped version of fwnode_for_each_available_child_node() following
the approach recently taken for other loops that handle child nodes like
for_each_child_of_node_scoped() or device_for_each_child_node_scoped(),
which are based on the __free() auto cleanup handler to remove the need
for fwnode_handle_put() on early loop exits.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 include/linux/property.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/property.h b/include/linux/property.h
index 61fc20e5f81f..bcc3dda5a9d8 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -168,6 +168,11 @@ struct fwnode_handle *fwnode_get_next_available_child_node(
 	for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
 	     child = fwnode_get_next_available_child_node(fwnode, child))

+#define fwnode_for_each_available_child_node_scoped(fwnode, child)	\
+	for (struct fwnode_handle *child __free(fwnode_handle) =	\
+		fwnode_get_next_available_child_node(fwnode, NULL);	\
+	     child; child = fwnode_get_next_available_child_node(fwnode, child))
+
 struct fwnode_handle *device_get_next_child_node(const struct device *dev,
 						 struct fwnode_handle *child);

-- 
2.40.1