linux-kernel - [PATCH v3 08/15] iommu/dart: Clean up bus_set

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Message-Id: <8ec57ffed411bfccd7d3eecbf24e0b90c1013289.1657034828.git.robin.murphy@arm.com>
Date:   Tue,  5 Jul 2022 18:08:31 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org
Cc:     will@...nel.org, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, baolu.lu@...ux.intel.com,
        suravee.suthikulpanit@....com, vasant.hegde@....com,
        mjrosato@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        schnelle@...ux.ibm.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 08/15] iommu/dart: Clean up bus_set_iommu()

Stop calling bus_set_iommu() since it's now unnecessary, and simplify
the probe failure path accordingly.

Tested-by: Sven Peter <sven@...npeter.dev>
Reviewed-by: Sven Peter <sven@...npeter.dev>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---

v3: No change

 drivers/iommu/apple-dart.c | 30 +-----------------------------
 1 file changed, 1 insertion(+), 29 deletions(-)

diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 8af0242a90d9..d7379e12d623 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -824,27 +824,6 @@ static irqreturn_t apple_dart_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static int apple_dart_set_bus_ops(const struct iommu_ops *ops)
-{
-	int ret;
-
-	if (!iommu_present(&platform_bus_type)) {
-		ret = bus_set_iommu(&platform_bus_type, ops);
-		if (ret)
-			return ret;
-	}
-#ifdef CONFIG_PCI
-	if (!iommu_present(&pci_bus_type)) {
-		ret = bus_set_iommu(&pci_bus_type, ops);
-		if (ret) {
-			bus_set_iommu(&platform_bus_type, NULL);
-			return ret;
-		}
-	}
-#endif
-	return 0;
-}
-
 static int apple_dart_probe(struct platform_device *pdev)
 {
 	int ret;
@@ -899,14 +878,10 @@ static int apple_dart_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, dart);
 
-	ret = apple_dart_set_bus_ops(&apple_dart_iommu_ops);
-	if (ret)
-		goto err_free_irq;
-
 	ret = iommu_device_sysfs_add(&dart->iommu, dev, NULL, "apple-dart.%s",
 				     dev_name(&pdev->dev));
 	if (ret)
-		goto err_remove_bus_ops;
+		goto err_free_irq;
 
 	ret = iommu_device_register(&dart->iommu, &apple_dart_iommu_ops, dev);
 	if (ret)
@@ -920,8 +895,6 @@ static int apple_dart_probe(struct platform_device *pdev)
 
 err_sysfs_remove:
 	iommu_device_sysfs_remove(&dart->iommu);
-err_remove_bus_ops:
-	apple_dart_set_bus_ops(NULL);
 err_free_irq:
 	free_irq(dart->irq, dart);
 err_clk_disable:
@@ -936,7 +909,6 @@ static int apple_dart_remove(struct platform_device *pdev)
 
 	apple_dart_hw_reset(dart);
 	free_irq(dart->irq, dart);
-	apple_dart_set_bus_ops(NULL);
 
 	iommu_device_unregister(&dart->iommu);
 	iommu_device_sysfs_remove(&dart->iommu);
-- 
2.36.1.dirty