iommu/arm-smmu-v3: Allow building as a module

By removing the redundant call to 'pci_request_acs()' we can allow the
ARM SMMUv3 driver to be built as a module.

Signed-off-by: Will Deacon <will@kernel.org>
Tested-by: John Garry <john.garry@huawei.com> # smmu v3
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/Kconfig

@@ -394,7 +394,7 @@ config ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT
 	  config.
 
 config ARM_SMMU_V3
-	bool "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
+	tristate "ARM Ltd. System MMU Version 3 (SMMUv3) Support"
 	depends on ARM64
 	select IOMMU_API
 	select IOMMU_IO_PGTABLE_LPAE

drivers/iommu/arm-smmu-v3.c

@@ -2733,6 +2733,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.get_resv_regions	= arm_smmu_get_resv_regions,
 	.put_resv_regions	= arm_smmu_put_resv_regions,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
+	.owner			= THIS_MODULE,
 };
 
 /* Probing and initialisation functions */
@@ -3571,8 +3572,6 @@ static int arm_smmu_set_bus_ops(struct iommu_ops *ops)
 
 #ifdef CONFIG_PCI
 	if (pci_bus_type.iommu_ops != ops) {
-		if (ops)
-			pci_request_acs();
 		err = bus_set_iommu(&pci_bus_type, ops);
 		if (err)
 			return err;