1 files changed, 16 insertions, 14 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 351843f847c0..83f4dd0bfd74 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -130,9 +130,6 @@ 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);
@@ -730,9 +727,6 @@ 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;
@@ -1514,7 +1508,7 @@ static void uart_set_termios(struct tty_struct *tty,
 	}
 
 	uart_change_speed(tty, state, old_termios);
-	/* reload cflag from termios; port driver may have overriden flags */
+	/* reload cflag from termios; port driver may have overridden flags */
 	cflag = tty->termios.c_cflag;
 
 	/* Handle transition to B0 status */
@@ -1747,6 +1741,16 @@ static void uart_dtr_rts(struct tty_port *port, int raise)
 	uart_port_deref(uport);
 }
 
+static int uart_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+	struct uart_driver *drv = driver->driver_state;
+	struct uart_state *state = drv->state + tty->index;
+
+	tty->driver_data = state;
+
+	return tty_standard_install(driver, tty);
+}
+
 /*
  * Calls to uart_open are serialised by the tty_lock in
  *   drivers/tty/tty_io.c:tty_open()
@@ -1759,11 +1763,8 @@ static void uart_dtr_rts(struct tty_port *port, int raise)
  */
 static int uart_open(struct tty_struct *tty, struct file *filp)
 {
-	struct uart_driver *drv = tty->driver->driver_state;
-	int retval, line = tty->index;
-	struct uart_state *state = drv->state + line;
-
-	tty->driver_data = state;
+	struct uart_state *state = tty->driver_data;
+	int retval;
 
 	retval = tty_port_open(&state->port, tty, filp);
 	if (retval > 0)
@@ -2448,6 +2449,7 @@ static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
 #endif
 
 static const struct tty_operations uart_ops = {
+	.install	= uart_install,
 	.open		= uart_open,
 	.close		= uart_close,
 	.write		= uart_write,
@@ -2505,7 +2507,7 @@ static const struct tty_port_operations uart_port_ops = {
 int uart_register_driver(struct uart_driver *drv)
 {
 	struct tty_driver *normal;
-	int i, retval;
+	int i, retval = -ENOMEM;
 
 	BUG_ON(drv->state);
 
@@ -2557,7 +2559,7 @@ int uart_register_driver(struct uart_driver *drv)
 out_kfree:
 	kfree(drv->state);
 out:
-	return -ENOMEM;
+	return retval;
 }
 
 /**