1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 5c01bb6d1c24..556f50aa1b58 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -130,6 +130,9 @@ static void uart_start(struct tty_struct *tty)
         struct uart_port *port;
         unsigned long flags;
 
+        if (!state)
+                return;
+
         port = uart_port_lock(state, flags);
         __uart_start(tty);
         uart_port_unlock(port, flags);
@@ -727,6 +730,9 @@ static void uart_unthrottle(struct tty_struct *tty)
         upstat_t mask = UPSTAT_SYNC_FIFO;
         struct uart_port *port;
 
+        if (!state)
+                return;
+
         port = uart_port_ref(state);
         if (!port)
                 return;