linux-kernel - [PATCH 05/13] iommu/arm-smmu-v3: Clean up bus_set

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Date:   Thu, 14 Apr 2022 13:42:34 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     iommu@...ts.linux-foundation.org, sven@...npeter.dev,
        robdclark@...il.com, m.szyprowski@...sung.com,
        baolu.lu@...ux.intel.com, yong.wu@...iatek.com,
        mjrosato@...ux.ibm.com, gerald.schaefer@...ux.ibm.com,
        zhang.lyra@...il.com, thierry.reding@...il.com, vdumpa@...dia.com,
        jean-philippe@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 05/13] iommu/arm-smmu-v3: Clean up bus_set_iommu()

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

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 53 +--------------------
 1 file changed, 2 insertions(+), 51 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 6699333fd17b..b221525c31b9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -28,8 +28,6 @@
 #include <linux/pci-ats.h>
 #include <linux/platform_device.h>
 
-#include <linux/amba/bus.h>
-
 #include "arm-smmu-v3.h"
 #include "../../iommu-sva-lib.h"
 
@@ -3698,43 +3696,6 @@ static unsigned long arm_smmu_resource_size(struct arm_smmu_device *smmu)
 		return SZ_128K;
 }
 
-static int arm_smmu_set_bus_ops(struct iommu_ops *ops)
-{
-	int err;
-
-#ifdef CONFIG_PCI
-	if (pci_bus_type.iommu_ops != ops) {
-		err = bus_set_iommu(&pci_bus_type, ops);
-		if (err)
-			return err;
-	}
-#endif
-#ifdef CONFIG_ARM_AMBA
-	if (amba_bustype.iommu_ops != ops) {
-		err = bus_set_iommu(&amba_bustype, ops);
-		if (err)
-			goto err_reset_pci_ops;
-	}
-#endif
-	if (platform_bus_type.iommu_ops != ops) {
-		err = bus_set_iommu(&platform_bus_type, ops);
-		if (err)
-			goto err_reset_amba_ops;
-	}
-
-	return 0;
-
-err_reset_amba_ops:
-#ifdef CONFIG_ARM_AMBA
-	bus_set_iommu(&amba_bustype, NULL);
-#endif
-err_reset_pci_ops: __maybe_unused;
-#ifdef CONFIG_PCI
-	bus_set_iommu(&pci_bus_type, NULL);
-#endif
-	return err;
-}
-
 static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t start,
 				      resource_size_t size)
 {
@@ -3838,27 +3799,17 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 	ret = iommu_device_register(&smmu->iommu, &arm_smmu_ops, dev);
 	if (ret) {
 		dev_err(dev, "Failed to register iommu\n");
-		goto err_sysfs_remove;
+		iommu_device_sysfs_remove(&smmu->iommu);
+		return ret;
 	}
 
-	ret = arm_smmu_set_bus_ops(&arm_smmu_ops);
-	if (ret)
-		goto err_unregister_device;
-
 	return 0;
-
-err_unregister_device:
-	iommu_device_unregister(&smmu->iommu);
-err_sysfs_remove:
-	iommu_device_sysfs_remove(&smmu->iommu);
-	return ret;
 }
 
 static int arm_smmu_device_remove(struct platform_device *pdev)
 {
 	struct arm_smmu_device *smmu = platform_get_drvdata(pdev);
 
-	arm_smmu_set_bus_ops(NULL);
 	iommu_device_unregister(&smmu->iommu);
 	iommu_device_sysfs_remove(&smmu->iommu);
 	arm_smmu_device_disable(smmu);
-- 
2.28.0.dirty