[clutter/clutter-1.20] evdev: Flush event queue before removing an input device

[Carlos Garnacho <carlosg src gnome org>]

commit 7764fd2079318fede95b4b96c72d18bd31699270
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Oct 14 12:41:10 2014 +0200

    evdev: Flush event queue before removing an input device
    
    libinput_suspend() will trigger the removal of input devices, but also
    the emission of button/key releases pairing everything that is pressed
    at that moment. These events are queued, but the ClutterInputDevice
    pointers in these will point to invalid memory at the time these are
    processed.
    
    Fix this by flushing the event queue, in order to ensure there are no
    unprocessed input events after libinput_suspend().
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738520

 clutter/evdev/clutter-device-manager-evdev.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)
---
diff --git a/clutter/evdev/clutter-device-manager-evdev.c b/clutter/evdev/clutter-device-manager-evdev.c
index 77a8ec6..7b48481 100644
--- a/clutter/evdev/clutter-device-manager-evdev.c
+++ b/clutter/evdev/clutter-device-manager-evdev.c
@@ -1017,6 +1017,18 @@ clutter_seat_evdev_sync_leds (ClutterSeatEvdev *seat)
     }
 }
 
+static void
+flush_event_queue (void)
+{
+  ClutterEvent *event;
+
+  while ((event = clutter_event_get ()) != NULL)
+    {
+      _clutter_process_event (event);
+      clutter_event_free (event);
+    }
+}
+
 static gboolean
 process_base_event (ClutterDeviceManagerEvdev *manager_evdev,
                     struct libinput_event *event)
@@ -1034,6 +1046,11 @@ process_base_event (ClutterDeviceManagerEvdev *manager_evdev,
       break;
 
     case LIBINPUT_EVENT_DEVICE_REMOVED:
+      /* Flush all queued events, there
+       * might be some from this device.
+       */
+      flush_event_queue ();
+
       libinput_device = libinput_event_get_device (event);
 
       device = libinput_device_get_user_data (libinput_device);