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authorVincent Donnefort <vdonnefort@gmail.com>2014-06-14 02:21:40 -0700
committerBryan Wu <cooloney@gmail.com>2014-07-03 12:02:14 -0700
commit8b37e1bef5a6b60e949e28a4db3006e4b00bd758 (patch)
tree3d9e31e6cb46cfa4bfc8f746b15dd737c0e068b2 /drivers/leds
parent7e7743901b53dd71bb7332b16b14bcce15ebcd69 (diff)
downloadlinux-8b37e1bef5a6b60e949e28a4db3006e4b00bd758.tar.bz2
leds: convert blink timer to workqueue
This patch converts the blink timer from led-core to workqueue which is more suitable for this kind of non-priority operations. Moreover, timer may lead to errors when a LED setting function use a scheduling function such as pinctrl which is using mutex. Signed-off-by: Vincent Donnefort <vdonnefort@gmail.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/led-class.c14
-rw-r--r--drivers/leds/led-core.c11
2 files changed, 13 insertions, 12 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index aa29198fca3e..129729d35478 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -15,10 +15,10 @@
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
-#include <linux/timer.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/leds.h>
+#include <linux/workqueue.h>
#include "leds.h"
static struct class *leds_class;
@@ -97,9 +97,10 @@ static const struct attribute_group *led_groups[] = {
NULL,
};
-static void led_timer_function(unsigned long data)
+static void led_work_function(struct work_struct *ws)
{
- struct led_classdev *led_cdev = (void *)data;
+ struct led_classdev *led_cdev =
+ container_of(ws, struct led_classdev, blink_work.work);
unsigned long brightness;
unsigned long delay;
@@ -143,7 +144,8 @@ static void led_timer_function(unsigned long data)
}
}
- mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
+ queue_delayed_work(system_wq, &led_cdev->blink_work,
+ msecs_to_jiffies(delay));
}
static void set_brightness_delayed(struct work_struct *ws)
@@ -231,9 +233,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
- init_timer(&led_cdev->blink_timer);
- led_cdev->blink_timer.function = led_timer_function;
- led_cdev->blink_timer.data = (unsigned long)led_cdev;
+ INIT_DELAYED_WORK(&led_cdev->blink_work, led_work_function);
#ifdef CONFIG_LEDS_TRIGGERS
led_trigger_set_default(led_cdev);
diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index 71b40d3bf776..4bb116867b88 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/rwsem.h>
#include <linux/leds.h>
+#include <linux/workqueue.h>
#include "leds.h"
DECLARE_RWSEM(leds_list_lock);
@@ -51,7 +52,7 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
return;
}
- mod_timer(&led_cdev->blink_timer, jiffies + 1);
+ queue_delayed_work(system_wq, &led_cdev->blink_work, 1);
}
@@ -75,7 +76,7 @@ void led_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
- del_timer_sync(&led_cdev->blink_timer);
+ cancel_delayed_work_sync(&led_cdev->blink_work);
led_cdev->flags &= ~LED_BLINK_ONESHOT;
led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
@@ -90,7 +91,7 @@ void led_blink_set_oneshot(struct led_classdev *led_cdev,
int invert)
{
if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
- timer_pending(&led_cdev->blink_timer))
+ delayed_work_pending(&led_cdev->blink_work))
return;
led_cdev->flags |= LED_BLINK_ONESHOT;
@@ -107,7 +108,7 @@ EXPORT_SYMBOL(led_blink_set_oneshot);
void led_stop_software_blink(struct led_classdev *led_cdev)
{
- del_timer_sync(&led_cdev->blink_timer);
+ cancel_delayed_work_sync(&led_cdev->blink_work);
led_cdev->blink_delay_on = 0;
led_cdev->blink_delay_off = 0;
}
@@ -116,7 +117,7 @@ EXPORT_SYMBOL_GPL(led_stop_software_blink);
void led_set_brightness(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
- /* delay brightness setting if need to stop soft-blink timer */
+ /* delay brightness setting if need to stop soft-blink work */
if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
led_cdev->delayed_set_value = brightness;
schedule_work(&led_cdev->set_brightness_work);