[PATCH 1/2] of: refuse to delete root node of live tree

[Sascha Hauer]

The root node of the live tree should never be deleted, so refuse to do
so and print an error message. Deleting the live tree was possible with
the oftree -f command which was removed in c39c70bac5 ("commands: oftree:
kill oftree -f"). As this no longer exists we also do not need the
of_set_root_node(NULL) part anymore.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/of/base.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 5756f8b60a..551b41fc9e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2441,6 +2441,11 @@ void of_delete_node(struct device_node *node)
 	if (!node)
 		return;
 
+	if (node == root_node) {
+		pr_err("Won't delete root device node\n");
+		return;
+	}
+
 	list_for_each_entry_safe(p, pt, &node->properties, list)
 		of_delete_property(p);
 
@@ -2459,9 +2464,6 @@ void of_delete_node(struct device_node *node)
 	free(node->name);
 	free(node->full_name);
 	free(node);
-
-	if (node == root_node)
-		of_set_root_node(NULL);
 }
 
 struct device_node *of_get_stdoutpath(void)
-- 
2.30.2