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-rw-r--r--drivers/iommu/arm-smmu-v3.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 15c01c3cd540..e6f9b2d745ca 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2636,17 +2636,26 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev)
/* And we're up. Go go go! */
of_iommu_set_ops(dev->of_node, &arm_smmu_ops);
#ifdef CONFIG_PCI
- pci_request_acs();
- ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
- if (ret)
- return ret;
+ if (pci_bus_type.iommu_ops != &arm_smmu_ops) {
+ pci_request_acs();
+ ret = bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
+ if (ret)
+ return ret;
+ }
#endif
#ifdef CONFIG_ARM_AMBA
- ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
- if (ret)
- return ret;
+ if (amba_bustype.iommu_ops != &arm_smmu_ops) {
+ ret = bus_set_iommu(&amba_bustype, &arm_smmu_ops);
+ if (ret)
+ return ret;
+ }
#endif
- return bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
+ if (platform_bus_type.iommu_ops != &arm_smmu_ops) {
+ ret = bus_set_iommu(&platform_bus_type, &arm_smmu_ops);
+ if (ret)
+ return ret;
+ }
+ return 0;
}
static int arm_smmu_device_remove(struct platform_device *pdev)