iommu/amd: Fix hotplug with iommu=pt

This did not work because devices are not put into the
pt_domain. Fix this.

Cc: stable@vger.kernel.org
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

drivers/iommu/amd_iommu.c

@@ -2254,6 +2254,18 @@ static int device_change_notifier(struct notifier_block *nb,
 
 		iommu_init_device(dev);
 
+		/*
+		 * dev_data is still NULL and
+		 * got initialized in iommu_init_device
+		 */
+		dev_data = get_dev_data(dev);
+
+		if (iommu_pass_through || dev_data->iommu_v2) {
+			dev_data->passthrough = true;
+			attach_device(dev, pt_domain);
+			break;
+		}
+
 		domain = domain_for_device(dev);
 
 		/* allocate a protection domain if a device is added */
@@ -2271,10 +2283,7 @@ static int device_change_notifier(struct notifier_block *nb,
 
 		dev_data = get_dev_data(dev);
 
-		if (!dev_data->passthrough)
 		dev->archdata.dma_ops = &amd_iommu_dma_ops;
-		else
-			dev->archdata.dma_ops = &nommu_dma_ops;
 
 		break;
 	case BUS_NOTIFY_DEL_DEVICE: