1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index bb1afa0922e1..9cd9b4eba9fc 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -368,7 +368,10 @@ static void receive_chars(struct uart_sio_port *up, int *status)
         ignore_char:
                 *status = serial_in(up, UART_LSR);
         } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+
+        spin_unlock(&up->port.lock);
         tty_flip_buffer_push(port);
+        spin_lock(&up->port.lock);
 }
 
 static void transmit_chars(struct uart_sio_port *up)