[PATCH 1/9] of: Add warpper function of_find_node_by_name_balanced()

[Zhang Zekun]

There are many drivers use of_find_node_by_name() with a not-NULL
device_node pointer, and a number of callers would require a call to
of_node_get() before using it. There are also some drivers who forget
to call of_node_get() which would cause a ref count leak[1]. So, Add a
wraper function for of_find_node_by_name(), drivers may use this function
to call of_find_node_by_name() with the refcount already balanced.

[1] https://lore.kernel.org/all/20241024015909.58654-1-zhangzekun11@huawei.com/

Signed-off-by: Zhang Zekun <zhangzekun11 at huawei.com>
---
 include/linux/of.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/of.h b/include/linux/of.h
index eaf0e2a2b75c..b7c6d7ff278c 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -268,6 +268,11 @@ static inline const char *of_node_full_name(const struct device_node *np)
 #define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
 extern struct device_node *of_find_node_by_name(struct device_node *from,
 	const char *name);
+static inline struct device_node *of_find_node_by_name_balanced(struct device_node *from,
+								const char *name)
+{
+	return of_find_node_by_name(of_node_get(from), name);
+}
 extern struct device_node *of_find_node_by_type(struct device_node *from,
 	const char *type);
 extern struct device_node *of_find_compatible_node(struct device_node *from,
-- 
2.22.0