diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index bffef8e47dac..281ca766698a 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1198,7 +1198,7 @@ void gserial_free_line(unsigned char port_num)
 	struct gs_port	*port;
 
 	mutex_lock(&ports[port_num].lock);
-	if (WARN_ON(!ports[port_num].port)) {
+	if (!ports[port_num].port) {
 		mutex_unlock(&ports[port_num].lock);
 		return;
 	}