[PATCH] serial: core: Fix error handling for serial_core_ctrl_device_add()

[Tony Lindgren]

Checking for NULL is not enough as serial_base_ctrl_add() uses ERR_PTR().

Fixes: 84a9582fd203 ("serial: core: Start managing serial controllers to enable runtime PM")
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
 drivers/tty/serial/serial_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -3342,7 +3342,7 @@ int serial_core_register_port(struct uart_driver *drv, struct uart_port *port)
 	ctrl_dev = serial_core_ctrl_find(drv, port->dev, port->ctrl_id);
 	if (!ctrl_dev) {
 		new_ctrl_dev = serial_core_ctrl_device_add(port);
-		if (!new_ctrl_dev) {
+		if (IS_ERR_OR_NULL(new_ctrl_dev)) {
 			ret = -ENODEV;
 			goto err_unlock;
 		}
-- 
2.41.0