Commit 448097bb authored by Jean-François Lessard's avatar Jean-François Lessard Committed by Wolfram Sang
Browse files

device property: Add scoped fwnode child node iterators 



Add scoped versions of fwnode child node iterators that automatically
handle reference counting cleanup using the __free() attribute:

- fwnode_for_each_child_node_scoped()
- fwnode_for_each_available_child_node_scoped()

These macros follow the same pattern as existing scoped iterators in the
kernel, ensuring fwnode references are automatically released when the
iterator variable goes out of scope. This prevents resource leaks and
eliminates the need for manual cleanup in error paths.

The implementation mirrors the non-scoped variants but uses
__free(fwnode_handle) for automatic resource management, providing a
safer and more convenient interface for drivers iterating over firmware
node children.

Signed-off-by: default avatarJean-François Lessard <jefflessard3@gmail.com>
Acked-by: default avatarDanilo Krummrich <dakr@kernel.org>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
parent 8f5ae30d

include/linux/property.h

+10 −0
Original line number Diff line number Diff line
@@ -176,6 +176,16 @@ 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_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_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);