linux-kernel - [PATCH] device property: introduce fwnode_for_each_child_node

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Message-Id: <20240502-fwnode_for_each_child_node_scoped-v1-1-868a2b168fa8@wolfvision.net>
Date: Thu, 02 May 2024 12:55:40 +0200
From: Javier Carrasco <javier.carrasco@...fvision.net>
To: 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>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH] device property: introduce
 fwnode_for_each_child_node_scoped()

Add a scoped version of fwnode_for_each_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@...fvision.net>
---
This macro has been tested with a patch series that has not been
applied yet and is under discussion in input [1], which makes use of the
non-scoped version of the loop.

Based on linux-next (next-20240502).

Link: https://lore.kernel.org/linux-input/20240422-feature-ts_virtobj_patch-v9-0-acf118d12a8a@wolfvision.net/ [1]
---
 include/linux/property.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/property.h b/include/linux/property.h
index 61fc20e5f81f..88f930165071 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -164,6 +164,11 @@ struct fwnode_handle *fwnode_get_next_available_child_node(
 	for (child = fwnode_get_next_child_node(fwnode, NULL); child;	\
 	     child = fwnode_get_next_child_node(fwnode, child))

+#define fwnode_for_each_child_node_scoped(fwnode, child)		\
+	for (struct fwnode_handle *child __free(fwnode_handle) =	\
+		fwnode_get_next_child_node(fwnode, NULL);		\
+	     child; child = fwnode_get_next_child_node(fwnode, child))
+
 #define fwnode_for_each_available_child_node(fwnode, child)		       \
 	for (child = fwnode_get_next_available_child_node(fwnode, NULL); child;\
 	     child = fwnode_get_next_available_child_node(fwnode, child))

---
base-commit: 9c6ecb3cb6e20c4fd7997047213ba0efcf9ada1a
change-id: 20240502-fwnode_for_each_child_node_scoped-ce15a9a831c3

Best regards,
-- 
Javier Carrasco <javier.carrasco@...fvision.net>