linux-kernel - [PATCH 02/13] leds: el15203000: Fix devm vs. non-devm ordering

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Message-ID: <1667983694-15040-3-git-send-email-wangyufen@huawei.com>
Date:   Wed, 9 Nov 2022 16:48:03 +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>,
        Oleh Kravchenko <oleg@....org.ua>
Subject: [PATCH 02/13] leds: el15203000: 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: fc19967bcb8f ("leds: add LED driver for EL15203000 board")
Signed-off-by: Wang Yufen <wangyufen@...wei.com>
Cc: Oleh Kravchenko <oleg@....org.ua>
---
 drivers/leds/leds-el15203000.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/leds/leds-el15203000.c b/drivers/leds/leds-el15203000.c
index 7e7b617..9be934e 100644
--- a/drivers/leds/leds-el15203000.c
+++ b/drivers/leds/leds-el15203000.c
@@ -287,10 +287,16 @@ static int el15203000_probe_dt(struct el15203000 *priv)
 	return ret;
 }
 
+static void el15203000_mutex_destroy(void *lock)
+{
+	mutex_destroy(lock);
+}
+
 static int el15203000_probe(struct spi_device *spi)
 {
 	struct el15203000	*priv;
 	size_t			count;
+	int			ret;
 
 	count = device_get_child_node_count(&spi->dev);
 	if (!count) {
@@ -312,15 +318,14 @@ static int el15203000_probe(struct spi_device *spi)
 
 	spi_set_drvdata(spi, priv);
 
+	ret = devm_add_action_or_reset(&spi->dev, el15203000_mutex_destroy,
+				       &priv->lock);
+	if (ret)
+		return ret;
+
 	return el15203000_probe_dt(priv);
 }
 
-static void el15203000_remove(struct spi_device *spi)
-{
-	struct el15203000 *priv = spi_get_drvdata(spi);
-
-	mutex_destroy(&priv->lock);
-}
 
 static const struct of_device_id el15203000_dt_ids[] = {
 	{ .compatible = "crane,el15203000", },
@@ -331,7 +336,6 @@ static void el15203000_remove(struct spi_device *spi)
 
 static struct spi_driver el15203000_driver = {
 	.probe		= el15203000_probe,
-	.remove		= el15203000_remove,
 	.driver = {
 		.name		= KBUILD_MODNAME,
 		.of_match_table	= el15203000_dt_ids,
-- 
1.8.3.1