diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 6f88b7dd2bc2..3eac456fe189 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -542,7 +542,6 @@ void serial8250_rpm_put(struct uart_8250_port *p)
 {
 	if (!(p->capabilities & UART_CAP_RPM))
 		return;
-	pm_runtime_mark_last_busy(p->port.dev);
 	pm_runtime_put_autosuspend(p->port.dev);
 }
 EXPORT_SYMBOL_GPL(serial8250_rpm_put);
@@ -683,7 +682,6 @@ static void serial8250_rpm_put_tx(struct uart_8250_port *p)
 	rpm_active = xchg(&p->rpm_tx_active, 0);
 	if (!rpm_active)
 		return;
-	pm_runtime_mark_last_busy(p->port.dev);
 	pm_runtime_put_autosuspend(p->port.dev);
 }