1 files changed, 2 insertions, 0 deletions

diff --git a/arch/mn10300/kernel/gdb-io-serial.c b/arch/mn10300/kernel/gdb-io-serial.c
index 9a6d4e8ebe73..11584c51acd9 100644
--- a/arch/mn10300/kernel/gdb-io-serial.c
+++ b/arch/mn10300/kernel/gdb-io-serial.c
@@ -99,6 +99,7 @@ int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
  try_again:
         /* pull chars out of the buffer */
         ix = gdbstub_rx_outp;
+        barrier();
         if (ix == gdbstub_rx_inp) {
                 if (nonblock)
                         return -EAGAIN;
@@ -110,6 +111,7 @@ int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
 
         ch = gdbstub_rx_buffer[ix++];
         st = gdbstub_rx_buffer[ix++];
+        barrier();
         gdbstub_rx_outp = ix & 0x00000fff;
 
         if (st & UART_LSR_BI) {