diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 339ecce1ad0d09a7aa716c1201821aa0ed28614a..afb0175bf592b351d6c35d239d4e1369076a7a40 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1377,6 +1377,7 @@ static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c,
 		return false; /* unable to transmit character */
 
 	pl011_write(c, uap, REG_DR);
+	mb();
 	uap->port.icount.tx++;
 
 	return true;