diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 52eb5f1fd023..793c52826b08 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1962,7 +1962,9 @@ int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 	 */
 	mutex_lock(&group->mutex);
 	ret = -EINVAL;
-	if (iommu_group_device_count(group) != 1)
+
+	/* don't break attach if iommu shared by more than one master */
+	if (iommu_group_device_count(group) < 1)
 		goto out_unlock;
 
 	ret = __iommu_attach_group(domain, group);