1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index b82815a0b65b..615bf62ad468 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -42,6 +42,7 @@ MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(serio_interrupt);
 EXPORT_SYMBOL(__serio_register_port);
 EXPORT_SYMBOL(serio_unregister_port);
+EXPORT_SYMBOL(serio_unregister_child_port);
 EXPORT_SYMBOL(__serio_unregister_port_delayed);
 EXPORT_SYMBOL(__serio_register_driver);
 EXPORT_SYMBOL(serio_unregister_driver);
@@ -179,12 +180,12 @@ static void serio_queue_event(void *object, struct module *owner,
         spin_lock_irqsave(&serio_event_lock, flags);
 
         /*
-         * Scan event list for the other events for the same serio port,
+         * Scan event list for the other events for the same serio port,
          * starting with the most recent one. If event is the same we
          * do not need add new one. If event is of different type we
          * need to add this event and should not look further because
          * we need to preseve sequence of distinct events.
-         */
+         */
         list_for_each_entry_reverse(event, &serio_event_list, node) {
                 if (event->object == object) {
                         if (event->type == event_type)
@@ -654,6 +655,19 @@ void serio_unregister_port(struct serio *serio)
 }
 
 /*
+ * Safely unregisters child port if one is present.
+ */
+void serio_unregister_child_port(struct serio *serio)
+{
+        down(&serio_sem);
+        if (serio->child) {
+                serio_disconnect_port(serio->child);
+                serio_destroy_port(serio->child);
+        }
+        up(&serio_sem);
+}
+
+/*
  * Submits register request to kseriod for subsequent execution.
  * Can be used when it is not obvious whether the serio_sem is
  * taken or not and when delayed execution is feasible.