[PATCH] leds: class: Revert: "If no default trigger is given, make hw_control trigger the default trigger"

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Commit 66601a29bb23 ("leds: class: If no default trigger is given, make
hw_control trigger the default trigger") causes ledtrig-netdev to get
set as default trigger on various network LEDs.

This causes users to hit a pre-existing AB-BA deadlock issue in
ledtrig-netdev between the LED-trigger locks and the rtnl mutex,
resulting in hung tasks in kernels >= 6.9.

Solving the deadlock is non trivial, so for now revert the change to
set the hw_control trigger as default trigger, so that ledtrig-netdev
no longer gets activated automatically for various network LEDs.

The netdev trigger is not needed because the network LEDs are usually under
hw-control and the netdev trigger tries to leave things that way so setting
it as the active trigger for the LED class device is a no-op.

Fixes: 66601a29bb23 ("leds: class: If no default trigger is given, make hw_control trigger the default trigger")
Reported-by: Genes Lists <lists@xxxxxxxxxxxx>
Closes: https://lore.kernel.org/all/9d189ec329cfe68ed68699f314e191a10d4b5eda.camel@xxxxxxxxxxxx/
Reported-by: "Johannes Wüller" <johanneswueller@xxxxxxxxx>
Closes: https://lore.kernel.org/lkml/e441605c-eaf2-4c2d-872b-d8e541f4cf60@xxxxxxxxx/
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 drivers/leds/led-class.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index 24fcff682b24..ba1be15cfd8e 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -552,12 +552,6 @@ int led_classdev_register_ext(struct device *parent,
 	led_init_core(led_cdev);
 
 #ifdef CONFIG_LEDS_TRIGGERS
-	/*
-	 * If no default trigger was given and hw_control_trigger is set,
-	 * make it the default trigger.
-	 */
-	if (!led_cdev->default_trigger && led_cdev->hw_control_trigger)
-		led_cdev->default_trigger = led_cdev->hw_control_trigger;
 	led_trigger_set_default(led_cdev);
 #endif
 
-- 
2.45.1





[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux