Input: do not try to filter out events if handler is not a filter

If given input handler is not a filter there is no point is iterating list
of events in a packet to see if some of them need to be filtered out.

Signed-off-by: Anshul Garg <anshul.g@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/input.c

@@ -100,23 +100,24 @@ static unsigned int input_to_handler(struct input_handle *handle,
 	struct input_value *end = vals;
 	struct input_value *v;
 
-	for (v = vals; v != vals + count; v++) {
-		if (handler->filter &&
-		    handler->filter(handle, v->type, v->code, v->value))
-			continue;
-		if (end != v)
-			*end = *v;
-		end++;
+	if (handler->filter) {
+		for (v = vals; v != vals + count; v++) {
+			if (handler->filter(handle, v->type, v->code, v->value))
+				continue;
+			if (end != v)
+				*end = *v;
+			end++;
+		}
+		count = end - vals;
 	}
 
-	count = end - vals;
 	if (!count)
 		return 0;
 
 	if (handler->events)
 		handler->events(handle, vals, count);
 	else if (handler->event)
-		for (v = vals; v != end; v++)
+		for (v = vals; v != vals + count; v++)
 			handler->event(handle, v->type, v->code, v->value);
 
 	return count;
@@ -143,8 +144,11 @@ static void input_pass_values(struct input_dev *dev,
 		count = input_to_handler(handle, vals, count);
 	} else {
 		list_for_each_entry_rcu(handle, &dev->h_list, d_node)
-			if (handle->open)
+			if (handle->open) {
 				count = input_to_handler(handle, vals, count);
+				if (!count)
+					break;
+			}
 	}
 
 	rcu_read_unlock();