linux-kernel - [PATCH -next v2 2/2] ARM: imx: add missing clk_disable

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Date:   Tue, 15 Jun 2021 20:52:39 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-imx@....com>
CC:     <shawnguo@...nel.org>
Subject: [PATCH -next v2 2/2] ARM: imx: add missing clk_disable_unprepare()

clock source is prepared and enabled by clk_prepare_enable()
in probe function, but no disable or unprepare in remove and
error path.

Fixes: 9454a0caff6a ("ARM: imx: add mmdc ipg clock operation for mmdc")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 arch/arm/mach-imx/mmdc.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-imx/mmdc.c b/arch/arm/mach-imx/mmdc.c
index 8e57691aafe2..4a6f1359e1e9 100644
--- a/arch/arm/mach-imx/mmdc.c
+++ b/arch/arm/mach-imx/mmdc.c
@@ -103,6 +103,7 @@ struct mmdc_pmu {
 	struct perf_event *mmdc_events[MMDC_NUM_COUNTERS];
 	struct hlist_node node;
 	struct fsl_mmdc_devtype_data *devtype_data;
+	struct clk *mmdc_ipg_clk;
 };
 
 /*
@@ -463,11 +464,13 @@ static int imx_mmdc_remove(struct platform_device *pdev)
 	cpuhp_state_remove_instance_nocalls(cpuhp_mmdc_state, &pmu_mmdc->node);
 	perf_pmu_unregister(&pmu_mmdc->pmu);
 	iounmap(pmu_mmdc->mmdc_base);
+	clk_disable_unprepare(pmu_mmdc->mmdc_ipg_clk);
 	kfree(pmu_mmdc);
 	return 0;
 }
 
-static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base)
+static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_base,
+			      struct clk *mmdc_ipg_clk)
 {
 	struct mmdc_pmu *pmu_mmdc;
 	char *name;
@@ -495,6 +498,7 @@ static int imx_mmdc_perf_init(struct platform_device *pdev, void __iomem *mmdc_b
 	}
 
 	mmdc_num = mmdc_pmu_init(pmu_mmdc, mmdc_base, &pdev->dev);
+	pmu_mmdc->mmdc_ipg_clk = mmdc_ipg_clk;
 	if (mmdc_num == 0)
 		name = "mmdc";
 	else
@@ -568,9 +572,11 @@ static int imx_mmdc_probe(struct platform_device *pdev)
 	val &= ~(1 << BP_MMDC_MAPSR_PSD);
 	writel_relaxed(val, reg);
 
-	err = imx_mmdc_perf_init(pdev, mmdc_base);
-	if (err)
+	err = imx_mmdc_perf_init(pdev, mmdc_base, mmdc_ipg_clk);
+	if (err) {
 		iounmap(mmdc_base);
+		clk_disable_unprepare(mmdc_ipg_clk);
+	}
 
 	return err;
 }
-- 
2.25.1