1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 0c41dbcb90b8..bcc8e1e8bb72 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -1282,18 +1282,22 @@ int tty_send_xchar(struct tty_struct *tty, char ch)
         int     was_stopped = tty->stopped;
 
         if (tty->ops->send_xchar) {
+                down_read(&tty->termios_rwsem);
                 tty->ops->send_xchar(tty, ch);
+                up_read(&tty->termios_rwsem);
                 return 0;
         }
 
         if (tty_write_lock(tty, 0) < 0)
                 return -ERESTARTSYS;
 
+        down_read(&tty->termios_rwsem);
         if (was_stopped)
                 start_tty(tty);
         tty->ops->write(tty, &ch, 1);
         if (was_stopped)
                 stop_tty(tty);
+        up_read(&tty->termios_rwsem);
         tty_write_unlock(tty);
         return 0;
 }