[PATCH/RFC v5 36/57] leds: pwm: remove work queue

From: Jacek Anaszewski
Date: Tue Aug 11 2015 - 05:46:40 EST


Now the core implements the work queue, remove it from the drivers.
If brightness setting is guaranteed not to sleep then implement
brightness_set_nonblocking op instead of brightness_set.

Signed-off-by: Jacek Anaszewski <j.anaszewski@xxxxxxxxxxx>
Cc: Raphael Assenat <raph@xxxxxx>
---
drivers/leds/leds-pwm.c | 29 ++++++++---------------------
1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c
index 1d07e3e..01e5838 100644
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -22,12 +22,10 @@
#include <linux/pwm.h>
#include <linux/leds_pwm.h>
#include <linux/slab.h>
-#include <linux/workqueue.h>

struct led_pwm_data {
struct led_classdev cdev;
struct pwm_device *pwm;
- struct work_struct work;
unsigned int active_low;
unsigned int period;
int duty;
@@ -51,14 +49,6 @@ static void __led_pwm_set(struct led_pwm_data *led_dat)
pwm_enable(led_dat->pwm);
}

-static void led_pwm_work(struct work_struct *work)
-{
- struct led_pwm_data *led_dat =
- container_of(work, struct led_pwm_data, work);
-
- __led_pwm_set(led_dat);
-}
-
static void led_pwm_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
@@ -75,10 +65,7 @@ static void led_pwm_set(struct led_classdev *led_cdev,

led_dat->duty = duty;

- if (led_dat->can_sleep)
- schedule_work(&led_dat->work);
- else
- __led_pwm_set(led_dat);
+ __led_pwm_set(led_dat);
}

static inline size_t sizeof_pwm_leds_priv(int num_leds)
@@ -89,11 +76,8 @@ static inline size_t sizeof_pwm_leds_priv(int num_leds)

static void led_pwm_cleanup(struct led_pwm_priv *priv)
{
- while (priv->num_leds--) {
+ while (priv->num_leds--)
led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
- if (priv->leds[priv->num_leds].can_sleep)
- cancel_work_sync(&priv->leds[priv->num_leds].work);
- }
}

static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
@@ -105,7 +89,6 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
led_data->active_low = led->active_low;
led_data->cdev.name = led->name;
led_data->cdev.default_trigger = led->default_trigger;
- led_data->cdev.brightness_set = led_pwm_set;
led_data->cdev.brightness = LED_OFF;
led_data->cdev.max_brightness = led->max_brightness;
led_data->cdev.flags = LED_CORE_SUSPENDRESUME;
@@ -122,8 +105,12 @@ static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
}

led_data->can_sleep = pwm_can_sleep(led_data->pwm);
- if (led_data->can_sleep)
- INIT_WORK(&led_data->work, led_pwm_work);
+ if (!led_data->can_sleep) {
+ led_data->cdev.brightness_set_nonblocking = led_pwm_set;
+ } else {
+ led_data->cdev.brightness_set = led_pwm_set;
+ led_data->cdev.flags |= LED_BRIGHTNESS_BLOCKING;
+ }

led_data->period = pwm_get_period(led_data->pwm);
if (!led_data->period && (led->pwm_period_ns > 0))
--
1.7.9.5

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