[PATCH] Input: Initialize input_no by -1
From: Aniroop Mathur <hidden>
Date: 2014-11-25 16:08:42
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
This patch initializes input_no by -1 in order to avoid extra subtraction operation performed everytime for allocation of an input device. Signed-off-by: Aniroop Mathur <redacted> --- 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 29ca0bb..01fe49e 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c@@ -1774,7 +1774,7 @@ 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);
@@ -1789,7 +1789,7 @@ struct input_dev *input_allocate_device(void) INIT_LIST_HEAD(&dev->node); dev_set_name(&dev->dev, "input%ld", - (unsigned long) atomic_inc_return(&input_no) - 1); + (unsigned long) atomic_inc_return(&input_no)); __module_get(THIS_MODULE); }
--
1.9.1