linux-kernel - [PATCH 06/13] leds: lp50xx: Fix devm vs. non-devm ordering

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Date:   Wed, 9 Nov 2022 16:48:07 +0800
From:   Wang Yufen <wangyufen@...wei.com>
To:     <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <pavel@....cz>, Wang Yufen <wangyufen@...wei.com>,
        Dan Murphy <dmurphy@...com>
Subject: [PATCH 06/13] leds: lp50xx: Fix devm vs. non-devm ordering

When non-devm resources are allocated they mustn't be followed by devm
allocations, otherwise it will break the tear down ordering and might
lead to crashes or other bugs during ->remove() stage. Fix this by
wrapping mutex_destroy() call with devm_add_action_or_reset().

Fixes: 242b81170fb8 ("leds: lp50xx: Add the LP50XX family of the RGB LED driver")
Signed-off-by: Wang Yufen <wangyufen@...wei.com>
Cc: Dan Murphy <dmurphy@...com>
---
 drivers/leds/leds-lp50xx.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-lp50xx.c b/drivers/leds/leds-lp50xx.c
index 28d6b39..fcec568e 100644
--- a/drivers/leds/leds-lp50xx.c
+++ b/drivers/leds/leds-lp50xx.c
@@ -521,6 +521,11 @@ static int lp50xx_probe_dt(struct lp50xx *priv)
 	return ret;
 }
 
+static void lp50xx_mutex_destroy(void *lock)
+{
+	mutex_destroy(lock);
+}
+
 static int lp50xx_probe(struct i2c_client *client)
 {
 	struct lp50xx *led;
@@ -539,6 +544,11 @@ static int lp50xx_probe(struct i2c_client *client)
 		return -ENOMEM;
 
 	mutex_init(&led->lock);
+	ret = devm_add_action_or_reset(&client->dev, lp50xx_mutex_destroy,
+				       &led->lock);
+	if (ret)
+		return ret;
+
 	led->client = client;
 	led->dev = &client->dev;
 	led->chip_info = device_get_match_data(&client->dev);
@@ -577,8 +587,6 @@ static void lp50xx_remove(struct i2c_client *client)
 		if (ret)
 			dev_err(led->dev, "Failed to disable regulator\n");
 	}
-
-	mutex_destroy(&led->lock);
 }
 
 static const struct i2c_device_id lp50xx_id[] = {
-- 
1.8.3.1