linux-kernel - [PATCH] leds: Convert timers to use timer

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Date:   Wed, 25 Oct 2017 03:30:01 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Richard Purdie <rpurdie@...ys.net>, Pavel Machek <pavel@....cz>,
        Willy Tarreau <w@....eu>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] leds: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Richard Purdie <rpurdie@...ys.net>
Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Willy Tarreau <w@....eu>
Cc: linux-leds@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/leds/led-core.c                  |  7 +++----
 drivers/leds/trigger/ledtrig-activity.c  | 14 ++++++++------
 drivers/leds/trigger/ledtrig-transient.c | 12 +++++++-----
 3 files changed, 18 insertions(+), 15 deletions(-)

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
index ef1360445413..fd83c7f77a95 100644
--- a/drivers/leds/led-core.c
+++ b/drivers/leds/led-core.c
@@ -45,9 +45,9 @@ static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
 	return led_cdev->brightness_set_blocking(led_cdev, value);
 }
 
-static void led_timer_function(unsigned long data)
+static void led_timer_function(struct timer_list *t)
 {
-	struct led_classdev *led_cdev = (void *)data;
+	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
 	unsigned long brightness;
 	unsigned long delay;
 
@@ -178,8 +178,7 @@ void led_init_core(struct led_classdev *led_cdev)
 {
 	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
 
-	setup_timer(&led_cdev->blink_timer, led_timer_function,
-		    (unsigned long)led_cdev);
+	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
 }
 EXPORT_SYMBOL_GPL(led_init_core);
 
diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
index c6635c5e227a..5081894082bd 100644
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -24,6 +24,7 @@ static int panic_detected;
 
 struct activity_data {
 	struct timer_list timer;
+	struct led_classdev *led_cdev;
 	u64 last_used;
 	u64 last_boot;
 	int time_left;
@@ -31,10 +32,11 @@ struct activity_data {
 	int invert;
 };
 
-static void led_activity_function(unsigned long data)
+static void led_activity_function(struct timer_list *t)
 {
-	struct led_classdev *led_cdev = (struct led_classdev *)data;
-	struct activity_data *activity_data = led_cdev->trigger_data;
+	struct activity_data *activity_data = from_timer(activity_data, t,
+							 timer);
+	struct led_classdev *led_cdev = activity_data->led_cdev;
 	struct timespec boot_time;
 	unsigned int target;
 	unsigned int usage;
@@ -195,11 +197,11 @@ static void activity_activate(struct led_classdev *led_cdev)
 		return;
 	}
 
-	setup_timer(&activity_data->timer,
-		    led_activity_function, (unsigned long)led_cdev);
+	activity_data->led_cdev = led_cdev;
+	timer_setup(&activity_data->timer, led_activity_function, 0);
 	if (!led_cdev->blink_brightness)
 		led_cdev->blink_brightness = led_cdev->max_brightness;
-	led_activity_function(activity_data->timer.data);
+	led_activity_function(&activity_data->timer);
 	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
 	led_cdev->activated = true;
 }
diff --git a/drivers/leds/trigger/ledtrig-transient.c b/drivers/leds/trigger/ledtrig-transient.c
index 7e6011bd3646..7acce64b692a 100644
--- a/drivers/leds/trigger/ledtrig-transient.c
+++ b/drivers/leds/trigger/ledtrig-transient.c
@@ -33,12 +33,14 @@ struct transient_trig_data {
 	int restore_state;
 	unsigned long duration;
 	struct timer_list timer;
+	struct led_classdev *led_cdev;
 };
 
-static void transient_timer_function(unsigned long data)
+static void transient_timer_function(struct timer_list *t)
 {
-	struct led_classdev *led_cdev = (struct led_classdev *) data;
-	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+	struct transient_trig_data *transient_data =
+		from_timer(transient_data, t, timer);
+	struct led_classdev *led_cdev = transient_data->led_cdev;
 
 	transient_data->activate = 0;
 	led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
@@ -169,6 +171,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
 		return;
 	}
 	led_cdev->trigger_data = tdata;
+	tdata->led_cdev = led_cdev;
 
 	rc = device_create_file(led_cdev->dev, &dev_attr_activate);
 	if (rc)
@@ -182,8 +185,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
 	if (rc)
 		goto err_out_state;
 
-	setup_timer(&tdata->timer, transient_timer_function,
-		    (unsigned long) led_cdev);
+	timer_setup(&tdata->timer, transient_timer_function, 0);
 	led_cdev->activated = true;
 
 	return;
-- 
2.7.4


-- 
Kees Cook
Pixel Security