diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index b2d18189d3d9..09475695effd 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -3194,6 +3194,7 @@ void serial8250_init_port(struct uart_8250_port *up)
 {
 	struct uart_port *port = &up->port;
 
+	spin_lock_init(&port->lock);
 	port->ops = &serial8250_pops;
 	port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_8250_CONSOLE);