From 9c7d66fa9bb21ef89c6acdd0cf536eb84e760d8b Mon Sep 17 00:00:00 2001 From: Aniroop Mathur Date: Tue, 2 Dec 2014 15:22:28 -0800 Subject: [PATCH] Input: initialize input_no to -1 to avoid subtraction 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: Aniroop Mathur Signed-off-by: Dmitry Torokhov --- drivers/input/input.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/input/input.c b/drivers/input/input.c index 0f175f5..04217c2 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -1775,7 +1775,7 @@ EXPORT_SYMBOL_GPL(input_class); */ 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; dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL); @@ -1790,7 +1790,7 @@ struct input_dev *input_allocate_device(void) INIT_LIST_HEAD(&dev->node); 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); } -- 2.7.4