serial_core: Get a reference for port->tty in uart_remove_one_port()

Suggested-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 203cb32638c3..3253905428ea 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2645,6 +2645,7 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 {
         struct uart_state *state = drv->state + uport->line;
         struct tty_port *port = &state->port;
+        struct tty_struct *tty;
         int ret = 0;
 
         BUG_ON(in_interrupt());
@@ -2673,8 +2674,11 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
          */
         tty_unregister_device(drv->tty_driver, uport->line);
 
-        if (port->tty)
+        tty = tty_port_tty_get(port);
+        if (tty) {
                 tty_vhangup(port->tty);
+                tty_kref_put(tty);
+        }
 
         /*
          * If the port is used as a console, unregister it