iommu/amd: Propagate errors from amd_iommu_init_api

This function can fail. Propagate any errors back to the
initialization state machine.
Signed-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu.c

@@ -2840,9 +2840,9 @@ static struct dma_map_ops amd_iommu_dma_ops = {
 	.dma_supported = amd_iommu_dma_supported,
 };
 
-void __init amd_iommu_init_api(void)
+int __init amd_iommu_init_api(void)
 {
-	bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
+	return bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
 }
 
 int __init amd_iommu_init_dma_ops(void)

drivers/iommu/amd_iommu_init.c

@@ -1391,9 +1391,10 @@ static int __init amd_iommu_init_pci(void)
 	for_each_iommu(iommu)
 		iommu_flush_all_caches(iommu);
 
-	amd_iommu_init_api();
+	ret = amd_iommu_init_api();
 
-	print_iommu_info();
+	if (!ret)
+		print_iommu_info();
 
 	return ret;
 }

drivers/iommu/amd_iommu_proto.h

@@ -30,7 +30,7 @@ extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu);
 extern int amd_iommu_init_devices(void);
 extern void amd_iommu_uninit_devices(void);
 extern void amd_iommu_init_notifier(void);
-extern void amd_iommu_init_api(void);
+extern int amd_iommu_init_api(void);
 
 /* Needed for interrupt remapping */
 extern int amd_iommu_prepare(void);