Input: stop autorepeat timer on key release

Whenever you press and then release a key, the CPU wakes up
three times:
 * press
 * release
 * autorepeat timer exactly 250ms after press

The autorepeat timer has nothing to do, obviously, since you already
have released the key, so stop it on key release.

[dtor@mail.ru: This changes autorepeat behavior a bit since we now stop
 autorepeat even if key that is being released is not the one that is
 being auto-repeated, but I believe the new behavior is better.]
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/input.c

@@ -132,6 +132,11 @@ static void input_start_autorepeat(struct input_dev *dev, int code)
 	}
 }
 
+static void input_stop_autorepeat(struct input_dev *dev)
+{
+	del_timer(&dev->timer);
+}
+
 #define INPUT_IGNORE_EVENT	0
 #define INPUT_PASS_TO_HANDLERS	1
 #define INPUT_PASS_TO_DEVICE	2
@@ -167,6 +172,8 @@ static void input_handle_event(struct input_dev *dev,
 				__change_bit(code, dev->key);
 				if (value)
 					input_start_autorepeat(dev, code);
+				else
+					input_stop_autorepeat(dev);
 			}
 
 			disposition = INPUT_PASS_TO_HANDLERS;