diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c
index 1a9a24b..00d1255 100644
--- a/drivers/serial/amba-pl010.c
+++ b/drivers/serial/amba-pl010.c
@@ -167,8 +167,9 @@
 	ignore_char:
 		status = readb(uap->port.membase + UART01x_FR);
 	}
+	spin_unlock(&port->lock);
 	tty_flip_buffer_push(tty);
-	return;
+	spin_lock(&port->lock);
 }
 
 static void pl010_tx_chars(struct uart_amba_port *uap)
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 44639e7..954073c 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -153,8 +153,9 @@
 	ignore_char:
 		status = readw(uap->port.membase + UART01x_FR);
 	}
+	spin_unlock(&uap->port.lock);
 	tty_flip_buffer_push(tty);
-	return;
+	spin_lock(&uap->port.lock);
 }
 
 static void pl011_tx_chars(struct uart_amba_port *uap)