linux-kernel - [PATCH 2/9] leds: lp8860: Check return value of devm_mutex

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Message-Id: <20250716144818.47650-3-boqun.feng@gmail.com>
Date: Wed, 16 Jul 2025 07:48:11 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Cc: "Will Deacon" <will@...nel.org>,
	"Waiman Long" <longman@...hat.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	Breno Leitao <leitao@...ian.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Andrew Davis <afd@...com>,
	Lee Jones <lee@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH 2/9] leds: lp8860: Check return value of devm_mutex_init()

From: Thomas Weißschuh <linux@...ssschuh.net>

devm_mutex_init() can fail. With CONFIG_DEBUG_MUTEXES=y the mutex will be
marked as unusable and trigger errors on usage.

Add the missed check.

Fixes: 87a59548af95 ("leds: lp8860: Use new mutex guards to cleanup function exits")
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
Acked-by: Andrew Davis <afd@...com>
Acked-by: Lee Jones <lee@...nel.org>
Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Link: https://lore.kernel.org/r/20250617-must_check-devm_mutex_init-v7-2-d9e449f4d224@weissschuh.net
---
 drivers/leds/leds-lp8860.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/leds-lp8860.c b/drivers/leds/leds-lp8860.c
index 52b97c9f2a03..0962c00c215a 100644
--- a/drivers/leds/leds-lp8860.c
+++ b/drivers/leds/leds-lp8860.c
@@ -307,7 +307,9 @@ static int lp8860_probe(struct i2c_client *client)
 	led->client = client;
 	led->led_dev.brightness_set_blocking = lp8860_brightness_set;
 
-	devm_mutex_init(&client->dev, &led->lock);
+	ret = devm_mutex_init(&client->dev, &led->lock);
+	if (ret)
+		return dev_err_probe(&client->dev, ret, "Failed to initialize lock\n");
 
 	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);
 	if (IS_ERR(led->regmap)) {
-- 
2.39.5 (Apple Git-154)