linux-kernel - [PATCH v2 3/3] mfd: exynos-lpass: Fix another error handling path in exynos_lpass

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Message-ID: <69471e839efc0249a504492a8de3497fcdb6a009.1745247209.git.christophe.jaillet@wanadoo.fr>
Date: Mon, 21 Apr 2025 17:00:35 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: lee@...nel.org,
	krzk@...nel.org,
	alim.akhtar@...sung.com,
	s.nawrocki@...sung.com,
	m.szyprowski@...sung.com,
	ideal.song@...sung.com,
	beomho.seo@...sung.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH v2 3/3] mfd: exynos-lpass: Fix another error handling path in exynos_lpass_probe()

If devm_of_platform_populate() fails, some clean-up needs to be done, as
already done in the remove function.

Add a new devm_add_action_or_reset() to fix the leak in the probe and
remove the need of a remove function.

Fixes: c695abab2429 ("mfd: Add Samsung Exynos Low Power Audio Subsystem driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only.

Changes in v2:
  - Use a new devm_add_action_or_reset() to fix the leak in the probe
    and remove the need of a remove function.
  - Update the commit description accordingly

v1: https://lore.kernel.org/all/d224865a16b50498279b044a819e1e187d01bb28.1743231856.git.christophe.jaillet@wanadoo.fr/
---
 drivers/mfd/exynos-lpass.c | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
index a2785ceea8bf..44797001a432 100644
--- a/drivers/mfd/exynos-lpass.c
+++ b/drivers/mfd/exynos-lpass.c
@@ -104,11 +104,22 @@ static const struct regmap_config exynos_lpass_reg_conf = {
 	.fast_io	= true,
 };
 
+static void exynos_lpass_disable_lpass(void *data)
+{
+	struct platform_device *pdev = data;
+	struct exynos_lpass *lpass = platform_get_drvdata(pdev);
+
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		exynos_lpass_disable(lpass);
+}
+
 static int exynos_lpass_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct exynos_lpass *lpass;
 	void __iomem *base_top;
+	int ret;
 
 	lpass = devm_kzalloc(dev, sizeof(*lpass), GFP_KERNEL);
 	if (!lpass)
@@ -134,16 +145,11 @@ static int exynos_lpass_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	exynos_lpass_enable(lpass);
 
-	return devm_of_platform_populate(dev);
-}
-
-static void exynos_lpass_remove(struct platform_device *pdev)
-{
-	struct exynos_lpass *lpass = platform_get_drvdata(pdev);
+	ret = devm_add_action_or_reset(dev, exynos_lpass_disable_lpass, pdev);
+	if (ret)
+		return ret;
 
-	pm_runtime_disable(&pdev->dev);
-	if (!pm_runtime_status_suspended(&pdev->dev))
-		exynos_lpass_disable(lpass);
+	return devm_of_platform_populate(dev);
 }
 
 static int __maybe_unused exynos_lpass_suspend(struct device *dev)
@@ -183,7 +189,6 @@ static struct platform_driver exynos_lpass_driver = {
 		.of_match_table	= exynos_lpass_of_match,
 	},
 	.probe	= exynos_lpass_probe,
-	.remove	= exynos_lpass_remove,
 };
 module_platform_driver(exynos_lpass_driver);
 
-- 
2.49.0