linux-kernel - [PATCH] iommu/msm: Use the devm_clk_get

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Message-Id: <14a5928a91fc8addf7f87a76428188ddc4271727.1681638224.git.christophe.jaillet@wanadoo.fr>
Date:   Sun, 16 Apr 2023 11:45:45 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-arm-msm@...r.kernel.org, iommu@...ts.linux.dev
Subject: [PATCH] iommu/msm: Use the devm_clk_get_prepared() helper function

Use the devm_clk_get_prepared() helper function instead of hand-writing it.
It saves some lines of code.

It also makes the error handling path of the probe and the remove function
useless.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
This patch has been cross-compiled only.
---
 drivers/iommu/msm_iommu.c | 62 ++++++++++-----------------------------
 1 file changed, 15 insertions(+), 47 deletions(-)

diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 79d89bad5132..5a9bbbd185cf 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -712,48 +712,30 @@ static int msm_iommu_probe(struct platform_device *pdev)
 	iommu->dev = &pdev->dev;
 	INIT_LIST_HEAD(&iommu->ctx_list);
 
-	iommu->pclk = devm_clk_get(iommu->dev, "smmu_pclk");
+	iommu->pclk = devm_clk_get_prepared(iommu->dev, "smmu_pclk");
 	if (IS_ERR(iommu->pclk))
 		return dev_err_probe(iommu->dev, PTR_ERR(iommu->pclk),
 				     "could not get smmu_pclk\n");
 
-	ret = clk_prepare(iommu->pclk);
-	if (ret)
-		return dev_err_probe(iommu->dev, ret,
-				     "could not prepare smmu_pclk\n");
-
-	iommu->clk = devm_clk_get(iommu->dev, "iommu_clk");
-	if (IS_ERR(iommu->clk)) {
-		clk_unprepare(iommu->pclk);
+	iommu->clk = devm_clk_get_prepared(iommu->dev, "iommu_clk");
+	if (IS_ERR(iommu->clk))
 		return dev_err_probe(iommu->dev, PTR_ERR(iommu->clk),
 				     "could not get iommu_clk\n");
-	}
-
-	ret = clk_prepare(iommu->clk);
-	if (ret) {
-		clk_unprepare(iommu->pclk);
-		return dev_err_probe(iommu->dev, ret, "could not prepare iommu_clk\n");
-	}
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	iommu->base = devm_ioremap_resource(iommu->dev, r);
-	if (IS_ERR(iommu->base)) {
-		ret = dev_err_probe(iommu->dev, PTR_ERR(iommu->base), "could not get iommu base\n");
-		goto fail;
-	}
+	if (IS_ERR(iommu->base))
+		return dev_err_probe(iommu->dev, PTR_ERR(iommu->base),
+				     "could not get iommu base\n");
 	ioaddr = r->start;
 
 	iommu->irq = platform_get_irq(pdev, 0);
-	if (iommu->irq < 0) {
-		ret = -ENODEV;
-		goto fail;
-	}
+	if (iommu->irq < 0)
+		return -ENODEV;
 
 	ret = of_property_read_u32(iommu->dev->of_node, "qcom,ncb", &val);
-	if (ret) {
-		dev_err(iommu->dev, "could not get ncb\n");
-		goto fail;
-	}
+	if (ret)
+		return dev_err_probe(iommu->dev, ret, "could not get ncb\n");
 	iommu->ncb = val;
 
 	msm_iommu_reset(iommu->base, iommu->ncb);
@@ -767,8 +749,7 @@ static int msm_iommu_probe(struct platform_device *pdev)
 
 	if (!par) {
 		pr_err("Invalid PAR value detected\n");
-		ret = -ENODEV;
-		goto fail;
+		return -ENODEV;
 	}
 
 	ret = devm_request_threaded_irq(iommu->dev, iommu->irq, NULL,
@@ -778,7 +759,7 @@ static int msm_iommu_probe(struct platform_device *pdev)
 					iommu);
 	if (ret) {
 		pr_err("Request IRQ %d failed with ret=%d\n", iommu->irq, ret);
-		goto fail;
+		return ret;
 	}
 
 	list_add(&iommu->dev_node, &qcom_iommu_devices);
@@ -787,23 +768,19 @@ static int msm_iommu_probe(struct platform_device *pdev)
 				     "msm-smmu.%pa", &ioaddr);
 	if (ret) {
 		pr_err("Could not add msm-smmu at %pa to sysfs\n", &ioaddr);
-		goto fail;
+		return ret;
 	}
 
 	ret = iommu_device_register(&iommu->iommu, &msm_iommu_ops, &pdev->dev);
 	if (ret) {
 		pr_err("Could not register msm-smmu at %pa\n", &ioaddr);
-		goto fail;
+		return ret;
 	}
 
 	pr_info("device mapped at %p, irq %d with %d ctx banks\n",
 		iommu->base, iommu->irq, iommu->ncb);
 
-	return ret;
-fail:
-	clk_unprepare(iommu->clk);
-	clk_unprepare(iommu->pclk);
-	return ret;
+	return 0;
 }
 
 static const struct of_device_id msm_iommu_dt_match[] = {
@@ -811,20 +788,11 @@ static const struct of_device_id msm_iommu_dt_match[] = {
 	{}
 };
 
-static void msm_iommu_remove(struct platform_device *pdev)
-{
-	struct msm_iommu_dev *iommu = platform_get_drvdata(pdev);
-
-	clk_unprepare(iommu->clk);
-	clk_unprepare(iommu->pclk);
-}
-
 static struct platform_driver msm_iommu_driver = {
 	.driver = {
 		.name	= "msm_iommu",
 		.of_match_table = msm_iommu_dt_match,
 	},
 	.probe		= msm_iommu_probe,
-	.remove_new	= msm_iommu_remove,
 };
 builtin_platform_driver(msm_iommu_driver);
-- 
2.34.1