This patch initializes atomic_t variables by -1 in order to avoid
extra subtraction operation performed everytime for allocation of
an input device.
Signed-off-by: Aniroop Mathur <aniroop.mathur@xxxxxxxxx>
---
drivers/input/gameport/gameport.c | 4 ++--
drivers/input/joystick/xpad.c | 4 ++--
drivers/input/misc/ims-pcu.c | 4 ++--
drivers/input/serio/serio.c | 4 ++--
drivers/input/serio/serio_raw.c | 4 ++--
5 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 24c41ba..d8371e8 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -490,14 +490,14 @@ EXPORT_SYMBOL(gameport_set_phys);
*/
static void gameport_init_port(struct gameport *gameport)
{
- static atomic_t gameport_no = ATOMIC_INIT(0);
+ static atomic_t gameport_no = ATOMIC_INIT(-1);
__module_get(THIS_MODULE);
mutex_init(&gameport->drv_mutex);
device_initialize(&gameport->dev);
dev_set_name(&gameport->dev, "gameport%lu",
- (unsigned long)atomic_inc_return(&gameport_no) - 1);
+ (unsigned long)atomic_inc_return(&gameport_no));
gameport->dev.bus = &gameport_bus;
gameport->dev.release = gameport_release_port;
if (gameport->parent)
diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 177602c..64dc7cb 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -850,7 +850,7 @@ static void xpad_led_set(struct led_classdev *led_cdev,
static int xpad_led_probe(struct usb_xpad *xpad)
{
- static atomic_t led_seq = ATOMIC_INIT(0);
+ static atomic_t led_seq = ATOMIC_INIT(-1);
long led_no;
struct xpad_led *led;
struct led_classdev *led_cdev;
@@ -863,7 +863,7 @@ static int xpad_led_probe(struct usb_xpad *xpad)
if (!led)
return -ENOMEM;
- led_no = (long)atomic_inc_return(&led_seq) - 1;
+ led_no = (long)atomic_inc_return(&led_seq);
snprintf(led->name, sizeof(led->name), "xpad%ld", led_no);
led->xpad = xpad;
diff --git a/drivers/input/misc/ims-pcu.c b/drivers/input/misc/ims-pcu.c
index 719410f..69caee9 100644
--- a/drivers/input/misc/ims-pcu.c
+++ b/drivers/input/misc/ims-pcu.c
@@ -1851,7 +1851,7 @@ static int ims_pcu_identify_type(struct ims_pcu *pcu, u8 *device_id)
static int ims_pcu_init_application_mode(struct ims_pcu *pcu)
{
- static atomic_t device_no = ATOMIC_INIT(0);
+ static atomic_t device_no = ATOMIC_INIT(-1);
const struct ims_pcu_device_info *info;
int error;
@@ -1882,7 +1882,7 @@ static int ims_pcu_init_application_mode(struct ims_pcu *pcu)
}
/* Device appears to be operable, complete initialization */
- pcu->device_no = atomic_inc_return(&device_no) - 1;
+ pcu->device_no = atomic_inc_return(&device_no);
/*
* PCU-B devices, both GEN_1 and GEN_2 do not have OFN sensor
diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index b29134d..21698cc 100644
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -514,7 +514,7 @@ static void serio_release_port(struct device *dev)
*/
static void serio_init_port(struct serio *serio)
{
- static atomic_t serio_no = ATOMIC_INIT(0);
+ static atomic_t serio_no = ATOMIC_INIT(-1);
__module_get(THIS_MODULE);
@@ -525,7 +525,7 @@ static void serio_init_port(struct serio *serio)
mutex_init(&serio->drv_mutex);
device_initialize(&serio->dev);
dev_set_name(&serio->dev, "serio%ld",
- (long)atomic_inc_return(&serio_no) - 1);
+ (long)atomic_inc_return(&serio_no));
serio->dev.bus = &serio_bus;
serio->dev.release = serio_release_port;
serio->dev.groups = serio_device_attr_groups;
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index c9a02fe..71ef5d6 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -292,7 +292,7 @@ static irqreturn_t serio_raw_interrupt(struct serio *serio, unsigned char data,
static int serio_raw_connect(struct serio *serio, struct serio_driver *drv)
{
- static atomic_t serio_raw_no = ATOMIC_INIT(0);
+ static atomic_t serio_raw_no = ATOMIC_INIT(-1);
struct serio_raw *serio_raw;
int err;
@@ -303,7 +303,7 @@ static int serio_raw_connect(struct serio *serio, struct serio_driver *drv)
}
snprintf(serio_raw->name, sizeof(serio_raw->name),
- "serio_raw%ld", (long)atomic_inc_return(&serio_raw_no) - 1);
+ "serio_raw%ld", (long)atomic_inc_return(&serio_raw_no));
kref_init(&serio_raw->kref);
INIT_LIST_HEAD(&serio_raw->client_list);
init_waitqueue_head(&serio_raw->wait);
--
1.9.1
--
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