linux-kernel - [PATCH 4.9 124/212] leds: core: Flush scheduled work for system suspend

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Message-Id: <20200820091608.611404453@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:21:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 124/212] leds: core: Flush scheduled work for system suspend

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

[ Upstream commit 302a085c20194bfa7df52e0fe684ee0c41da02e6 ]

Sometimes LED won't be turned off by LED_CORE_SUSPENDRESUME flag upon
system suspend.

led_set_brightness_nopm() uses schedule_work() to set LED brightness.
However, there's no guarantee that the scheduled work gets executed
because no one flushes the work.

So flush the scheduled work to make sure LED gets turned off.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
Fixes: 81fe8e5b73e3 ("leds: core: Add led_set_brightness_nosleep{nopm} functions")
Signed-off-by: Pavel Machek <pavel@....cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/leds/led-class.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index aa84e5b375931..7d3f23bad88dd 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -110,6 +110,7 @@ void led_classdev_suspend(struct led_classdev *led_cdev)
 {
 	led_cdev->flags |= LED_SUSPENDED;
 	led_set_brightness_nopm(led_cdev, 0);
+	flush_work(&led_cdev->set_brightness_work);
 }
 EXPORT_SYMBOL_GPL(led_classdev_suspend);
 
-- 
2.25.1