Patch "leds: trigger: panic: Don't register panic notifier if creating the trigger failed" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    leds: trigger: panic: Don't register panic notifier if creating the trigger failed

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     leds-trigger-panic-don-t-register-panic-notifier-if-.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit a1aae735e504a64430316fb649ef3f4b60eedd79
Author: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date:   Sat Dec 16 21:05:33 2023 +0100

    leds: trigger: panic: Don't register panic notifier if creating the trigger failed
    
    [ Upstream commit afacb21834bb02785ddb0c3ec197208803b74faa ]
    
    It doesn't make sense to register the panic notifier if creating the
    panic trigger failed.
    
    Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
    Link: https://lore.kernel.org/r/8a61e229-5388-46c7-919a-4d18cc7362b2@xxxxxxxxx
    Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c
index 64abf2e91608..5a6b21bfeb9a 100644
--- a/drivers/leds/trigger/ledtrig-panic.c
+++ b/drivers/leds/trigger/ledtrig-panic.c
@@ -64,10 +64,13 @@ static long led_panic_blink(int state)
 
 static int __init ledtrig_panic_init(void)
 {
+	led_trigger_register_simple("panic", &trigger);
+	if (!trigger)
+		return -ENOMEM;
+
 	atomic_notifier_chain_register(&panic_notifier_list,
 				       &led_trigger_panic_nb);
 
-	led_trigger_register_simple("panic", &trigger);
 	panic_blink = led_panic_blink;
 	return 0;
 }