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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/leds/trigger/ledtrig-timer.c
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@@ -1,13 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * LED Kernel Timer Trigger
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  *
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  * Copyright 2005-2006 Openedhand Ltd.
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  *
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  * Author: Richard Purdie <rpurdie@openedhand.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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9
 
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 #include <linux/module.h>
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@@ -15,6 +12,7 @@
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 #include <linux/init.h>
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 #include <linux/device.h>
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 #include <linux/ctype.h>
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+#include <linux/slab.h>
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 #include <linux/leds.h>
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17
 
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 static ssize_t led_delay_on_show(struct device *dev,
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@@ -30,7 +28,7 @@
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 {
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 	struct led_classdev *led_cdev = led_trigger_get_led(dev);
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 	unsigned long state;
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-	ssize_t ret = -EINVAL;
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+	ssize_t ret;
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 	ret = kstrtoul(buf, 10, &state);
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 	if (ret)
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@@ -55,7 +53,7 @@
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 {
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 	struct led_classdev *led_cdev = led_trigger_get_led(dev);
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 	unsigned long state;
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-	ssize_t ret = -EINVAL;
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+	ssize_t ret;
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 	ret = kstrtoul(buf, 10, &state);
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 	if (ret)
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@@ -77,8 +75,46 @@
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 };
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 ATTRIBUTE_GROUPS(timer_trig);
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+static void pattern_init(struct led_classdev *led_cdev)
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+{
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+	u32 *pattern;
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+	unsigned int size = 0;
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+
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+	pattern = led_get_default_pattern(led_cdev, &size);
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+	if (!pattern)
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+		return;
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+
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+	if (size != 2) {
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+		dev_warn(led_cdev->dev,
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+			 "Expected 2 but got %u values for delays pattern\n",
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+			 size);
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+		goto out;
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+	}
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+
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+	led_cdev->blink_delay_on = pattern[0];
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+	led_cdev->blink_delay_off = pattern[1];
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+	/* led_blink_set() called by caller */
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+
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+out:
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+	kfree(pattern);
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+}
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+
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 static int timer_trig_activate(struct led_classdev *led_cdev)
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 {
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+	if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
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+		pattern_init(led_cdev);
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+		/*
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+		 * Mark as initialized even on pattern_init() error because
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+		 * any consecutive call to it would produce the same error.
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+		 */
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+		led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
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+	}
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+
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+	/*
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+	 * If "set brightness to 0" is pending in workqueue, we don't
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+	 * want that to be reordered after blink_set()
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+	 */
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+	flush_work(&led_cdev->set_brightness_work);
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 	led_blink_set(led_cdev, &led_cdev->blink_delay_on,
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 		      &led_cdev->blink_delay_off);
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