Input: mousedev - do not wake up readers when receiving 0-motion

       event.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/input/mousedev.c b/drivers/input/mousedev.c
index 96fb9870834a..08b191180af0 100644
--- a/drivers/input/mousedev.c
+++ b/drivers/input/mousedev.c
@@ -220,6 +220,7 @@ static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_h
         struct mousedev_list *list;
         struct mousedev_motion *p;
         unsigned long flags;
+        int wake_readers = 0;
 
         list_for_each_entry(list, &mousedev->list, node) {
                 spin_lock_irqsave(&list->packet_lock, flags);
@@ -255,11 +256,14 @@ static void mousedev_notify_readers(struct mousedev *mousedev, struct mousedev_h
 
                 spin_unlock_irqrestore(&list->packet_lock, flags);
 
-                if (list->ready)
+                if (list->ready) {
                         kill_fasync(&list->fasync, SIGIO, POLL_IN);
+                        wake_readers = 1;
+                }
         }
 
-        wake_up_interruptible(&mousedev->wait);
+        if (wake_readers)
+                wake_up_interruptible(&mousedev->wait);
 }
 
 static void mousedev_touchpad_touch(struct mousedev *mousedev, int value)