Input: initialize input_no to -1 to avoid subtraction (9c7d66fa) · Commits · 戴 / test

Let's initializes input_no to -1 in order to avoid extra subtraction operation performed every time we allocate an input device. Signed-off-by:

drivers/input/input.c

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -1775,7 +1775,7 @@ EXPORT_SYMBOL_GPL(input_class);
	*/		*/
	struct input_dev *input_allocate_device(void)		struct input_dev *input_allocate_device(void)
	{		{
	static atomic_t input_no = ATOMIC_INIT(0);		static atomic_t input_no = ATOMIC_INIT(-1);
	struct input_dev *dev;		struct input_dev *dev;

	dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);		dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
	@@ -1790,7 +1790,7 @@ struct input_dev *input_allocate_device(void)
	INIT_LIST_HEAD(&dev->node);		INIT_LIST_HEAD(&dev->node);

	dev_set_name(&dev->dev, "input%lu",		dev_set_name(&dev->dev, "input%lu",
	(unsigned long) atomic_inc_return(&input_no) - 1);		(unsigned long)atomic_inc_return(&input_no));

	__module_get(THIS_MODULE);		__module_get(THIS_MODULE);
	}		}