[PATCH v2] counter: rz-mtu3-cnt: put runtime PM ref if counter init fails

[Li Youhong]

From: Li Youhong <liyouhong@xxxxxxxxxx>

Counter enable takes a runtime PM reference before initialization but
only puts it on disable. Drop the reference if initialization fails.

Fixes: 0be8907359df ("counter: Add Renesas RZ/G2L MTU3a counter driver")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@xxxxxxxxxxx>
Signed-off-by: Li Youhong <liyouhong@xxxxxxxxxx>
---
v2:
- Add Cc: stable@xxxxxxxxxxxxxxx.
- v1: https://lore.kernel.org/all/20261008020506.211566-1-dayou5941@xxxxxxx/

 drivers/counter/rz-mtu3-cnt.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/counter/rz-mtu3-cnt.c b/drivers/counter/rz-mtu3-cnt.c
index 7bfb6979193c..61fbeb122851 100644
--- a/drivers/counter/rz-mtu3-cnt.c
+++ b/drivers/counter/rz-mtu3-cnt.c
@@ -506,8 +506,11 @@ static int rz_mtu3_count_enable_write(struct counter_device *counter,
 	if (enable) {
 		pm_runtime_get_sync(counter->parent);
 		ret = rz_mtu3_initialize_counter(counter, count->id);
-		if (ret == 0)
-			priv->count_is_enabled[count->id] = true;
+		if (ret < 0) {
+			pm_runtime_put(counter->parent);
+			goto exit;
+		}
+		priv->count_is_enabled[count->id] = true;
 	} else {
 		rz_mtu3_terminate_counter(counter, count->id);
 		priv->count_is_enabled[count->id] = false;
-- 
2.25.1