FAILED: patch "[PATCH] backlight: led_bl: Hold led_access lock when calling" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 276822a00db3c1061382b41e72cafc09d6a0ec30
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2025041744-widely-hypnosis-3013@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 276822a00db3c1061382b41e72cafc09d6a0ec30 Mon Sep 17 00:00:00 2001
From: Herve Codina <[email protected]>
Date: Wed, 22 Jan 2025 10:19:14 +0100
Subject: [PATCH] backlight: led_bl: Hold led_access lock when calling
led_sysfs_disable()

Lockdep detects the following issue on led-backlight removal:

  [  142.315935] ------------[ cut here ]------------
  [  142.315954] WARNING: CPU: 2 PID: 292 at drivers/leds/led-core.c:455 led_sysfs_enable+0x54/0x80
  ...
  [  142.500725] Call trace:
  [  142.503176]  led_sysfs_enable+0x54/0x80 (P)
  [  142.507370]  led_bl_remove+0x80/0xa8 [led_bl]
  [  142.511742]  platform_remove+0x30/0x58
  [  142.515501]  device_remove+0x54/0x90
  ...

Indeed, led_sysfs_enable() has to be called with the led_access lock held.

Hold the lock when calling led_sysfs_disable().

index ae34d1ecbfbe..d2db157b2c29 100644
@@ -229,8 +229,11 @@ static void led_bl_remove(struct platform_device *pdev)
 	backlight_device_unregister(bl);
 
 	led_bl_power_off(priv);
-	for (i = 0; i < priv->nb_leds; i++)
+	for (i = 0; i < priv->nb_leds; i++) {
+		mutex_lock(&priv->leds[i]->led_access);
 		led_sysfs_enable(priv->leds[i]);
+		mutex_unlock(&priv->leds[i]->led_access);
+	}
 }
 
 static const struct of_device_id led_bl_of_match[] = {