linux-kernel - [PATCH v2 1/2] thermal: mediatek: use devm_of_iomap to avoid resource leak in mtk_thermal

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Message-Id: <20230403164610.3608082-1-void0red@hust.edu.cn>
Date:   Tue,  4 Apr 2023 00:46:09 +0800
From:   Kang Chen <void0red@...t.edu.cn>
To:     daniel.lezcano@...aro.org
Cc:     amitk@...nel.org, angelogioacchino.delregno@...labora.com,
        bchihi@...libre.com, daniel@...rotopia.org, dzm91@...t.edu.cn,
        error27@...il.com, henry.yen@...iatek.com,
        hust-os-kernel-patches@...glegroups.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-pm@...r.kernel.org,
        matthias.bgg@...il.com, rafael@...nel.org, rdunlap@...radead.org,
        rui.zhang@...el.com, void0red@...il.com, void0red@...t.edu.cn
Subject: [PATCH v2 1/2] thermal: mediatek: use devm_of_iomap to avoid resource leak in mtk_thermal_probe

Smatch reports:
1. mtk_thermal_probe() warn: 'apmixed_base' from of_iomap() not released.
2. mtk_thermal_probe() warn: 'auxadc_base' from of_iomap() not released.

The original code forgets to release iomap resource when handling errors,
fix it by switch to devm_of_iomap.

Fixes: 89945047b166 ("thermal: mediatek: Add tsensor support for V2 thermal system")
Signed-off-by: Kang Chen <void0red@...t.edu.cn>
---
v2 -> v1: use devm_of_iomap instead.

 drivers/thermal/mediatek/auxadc_thermal.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/mediatek/auxadc_thermal.c b/drivers/thermal/mediatek/auxadc_thermal.c
index ab730f9552d0..df5e2e354408 100644
--- a/drivers/thermal/mediatek/auxadc_thermal.c
+++ b/drivers/thermal/mediatek/auxadc_thermal.c
@@ -1142,7 +1142,10 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	auxadc_base = of_iomap(auxadc, 0);
+	auxadc_base = devm_of_iomap(&pdev->dev, auxadc, 0, NULL);
+	if (IS_ERR(auxadc_base))
+		return PTR_ERR(auxadc_base);
+
 	auxadc_phys_base = of_get_phys_base(auxadc);
 
 	of_node_put(auxadc);
@@ -1158,7 +1161,10 @@ static int mtk_thermal_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	apmixed_base = of_iomap(apmixedsys, 0);
+	apmixed_base = devm_of_iomap(&pdev->dev, apmixedsys, 0, NULL);
+	if (IS_ERR(apmixed_base)
+		return PTR_ERR(apmixed_base);
+
 	apmixed_phys_base = of_get_phys_base(apmixedsys);
 
 	of_node_put(apmixedsys);
-- 
2.34.1