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>
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index aa29198..129729d 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 @@
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 @@
}
}
- 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 @@
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);