diff options
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 046279ce3e8..78036c510cc 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2501,9 +2501,12 @@ void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) { struct uart_state *state = uport->state; struct tty_port *port = &state->port; - struct tty_ldisc *ld = tty_ldisc_ref(port->tty); + struct tty_ldisc *ld = NULL; struct pps_event_time ts; + struct tty_struct *tty = port->tty; + if (tty) + ld = tty_ldisc_ref(tty); if (ld && ld->ops->dcd_change) pps_get_ts(&ts); @@ -2516,12 +2519,12 @@ void uart_handle_dcd_change(struct uart_port *uport, unsigned int status) if (port->flags & ASYNC_CHECK_CD) { if (status) wake_up_interruptible(&port->open_wait); - else if (port->tty) - tty_hangup(port->tty); + else if (tty) + tty_hangup(tty); } if (ld && ld->ops->dcd_change) - ld->ops->dcd_change(port->tty, status, &ts); + ld->ops->dcd_change(tty, status, &ts); if (ld) tty_ldisc_deref(ld); } |