[PATCH v1] bus: ti-sysc: Fix /chosen node reference leak

[Yuho Choi]

sysc_init_stdout_path() gets the /chosen node with
of_find_node_by_path() to read stdout-path. The function then overwrites
the local node pointer with the stdout-path lookup result, or exits on
error, without dropping the /chosen reference.

Keep the /chosen node in a separate variable and put it after the
stdout-path value has been used for the lookup. The successful stdout
node lookup remains referenced by the cached stdout_path pointer.

Fixes: 3bb37c8e6e6a ("bus: ti-sysc: Handle stdout-path for debug console")
Signed-off-by: Yuho Choi <dbgh9129@xxxxxxxxx>
---
 drivers/bus/ti-sysc.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index a5b9507de37c..e118b900c9ac 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -682,6 +682,7 @@ static struct device_node *stdout_path;
 
 static void sysc_init_stdout_path(struct sysc *ddata)
 {
+	struct device_node *chosen;
 	struct device_node *np = NULL;
 	const char *uart;
 
@@ -691,15 +692,18 @@ static void sysc_init_stdout_path(struct sysc *ddata)
 	if (stdout_path)
 		return;
 
-	np = of_find_node_by_path("/chosen");
-	if (!np)
+	chosen = of_find_node_by_path("/chosen");
+	if (!chosen)
 		goto err;
 
-	uart = of_get_property(np, "stdout-path", NULL);
-	if (!uart)
+	uart = of_get_property(chosen, "stdout-path", NULL);
+	if (!uart) {
+		of_node_put(chosen);
 		goto err;
+	}
 
 	np = of_find_node_by_path(uart);
+	of_node_put(chosen);
 	if (!np)
 		goto err;
 
-- 
2.43.0