[PATCH 1/2] of: overlay: improve error handling in of_overlay_apply_tree

[Michael Riesch <michael.riesch@wolfvision.net>]

Propagate any error from of_overlay_apply_symbols and let the user
know if the provided overlay is not applicable.

Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
---
 drivers/of/overlay.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 20a43f5170..20686db511 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -115,8 +115,8 @@ static char *of_overlay_fix_path(struct device_node *root,
 	return basprintf("%s%s", target->full_name, path_tail);
 }
 
-static void of_overlay_apply_symbols(struct device_node *root,
-				     struct device_node *overlay)
+static int of_overlay_apply_symbols(struct device_node *root,
+				    struct device_node *overlay)
 {
 	const char *old_path;
 	char *new_path;
@@ -129,12 +129,12 @@ static void of_overlay_apply_symbols(struct device_node *root,
 
 	if (!overlay_symbols) {
 		pr_debug("overlay doesn't have a __symbols__ node\n");
-		return;
+		return -EINVAL;
 	}
 
 	if (!root_symbols) {
 		pr_info("root doesn't have a __symbols__ node\n");
-		return;
+		return -EINVAL;
 	}
 
 	list_for_each_entry(prop, &overlay_symbols->properties, list) {
@@ -148,6 +148,8 @@ static void of_overlay_apply_symbols(struct device_node *root,
 			 prop->name, new_path);
 		of_property_write_string(root_symbols, prop->name, new_path);
 	}
+
+	return 0;
 }
 
 static int of_overlay_apply_fragment(struct device_node *root,
@@ -190,7 +192,9 @@ int of_overlay_apply_tree(struct device_node *root,
 		goto out_err;
 
 	/* Copy symbols from resolved overlay to base device tree */
-	of_overlay_apply_symbols(root, resolved);
+	err = of_overlay_apply_symbols(root, resolved);
+	if (err)
+		goto out_err;
 
 	/* Copy nodes and properties from resolved overlay to root */
 	for_each_child_of_node(resolved, fragment) {
-- 
2.30.2