serial: introduce tty krefs

Initially just use the helper and thus krefs when we set and clear the
port values.

Signed-off-by: Alan Cox <alan@linux.intel.com>

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 69c4e20..3fd0134 100644 (file)
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1333,7 +1333,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
        tty_ldisc_flush(tty);
 
        tty->closing = 0;
-       port->tty = NULL;
+       tty_port_tty_set(port, NULL);
 
        if (port->blocked_open) {
                if (port->close_delay)
@@ -1431,7 +1431,7 @@ static void uart_hangup(struct tty_struct *tty)
                uart_shutdown(state);
                port->count = 0;
                clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
-               port->tty = NULL;
+               tty_port_tty_set(port, NULL);
                wake_up_interruptible(&port->open_wait);
                wake_up_interruptible(&port->delta_msr_wait);
        }
@@ -1639,7 +1639,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
        state->uart_port->state = state;
        tty->low_latency = (state->uart_port->flags & UPF_LOW_LATENCY) ? 1 : 0;
        tty->alt_speed = 0;
-       port->tty = tty;
+       tty_port_tty_set(port, tty);
 
        /*
         * If the port is in the middle of closing, bail out now.