linux-kernel - [PATCH AUTOSEL 4.19 1/5] leds: trigger: panic: Don't register panic notifier if creating the trigger failed

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Message-ID: <20240124143149.1284622-1-sashal@kernel.org>
Date: Wed, 24 Jan 2024 09:31:36 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	Lee Jones <lee@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	pavel@....cz,
	linux-leds@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 1/5] leds: trigger: panic: Don't register panic notifier if creating the trigger failed

From: Heiner Kallweit <hkallweit1@...il.com>

[ 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@...il.com>
Link: https://lore.kernel.org/r/8a61e229-5388-46c7-919a-4d18cc7362b2@gmail.com
Signed-off-by: Lee Jones <lee@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/leds/trigger/ledtrig-panic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c
index d735526b9db4..2fc04418a87e 100644
--- a/drivers/leds/trigger/ledtrig-panic.c
+++ b/drivers/leds/trigger/ledtrig-panic.c
@@ -67,10 +67,13 @@ 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;
 }
-- 
2.43.0