1 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 8c3dd36fe91a..78dd1e7120a9 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -491,9 +491,13 @@ 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 timespec ts;
 
-        uport->icount.dcd++;
+        if (ld && ld->ops->dcd_change)
+                getnstimeofday(&ts);
 
+        uport->icount.dcd++;
 #ifdef CONFIG_HARD_PPS
         if ((uport->flags & UPF_HARDPPS_CD) && status)
                 hardpps();
@@ -505,6 +509,11 @@ uart_handle_dcd_change(struct uart_port *uport, unsigned int status)
                 else if (port->tty)
                         tty_hangup(port->tty);
         }
+
+        if (ld && ld->ops->dcd_change)
+                ld->ops->dcd_change(port->tty, status, &ts);
+        if (ld)
+                tty_ldisc_deref(ld);
 }
 
 /**