diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 9e8ea190779606d4ce07657fa688f54e68676f22..b531307a9360a3d245f043dc8b39ca9de74442f3 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2472,6 +2472,9 @@ static struct protection_domain *get_domain(struct device *dev)
 		domain = to_pdomain(io_domain);
 		attach_device(dev, domain);
 	}
+	if (domain == NULL)
+		return ERR_PTR(-EBUSY);
+
 	if (!dma_ops_domain(domain))
 		return ERR_PTR(-EBUSY);