iommu: Don't overwrite domain pointer when there is no default_domain

[cascardo/linux.git] / drivers / iommu / iommu.c

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index bfd4f7c..b9df141 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -848,7 +848,8 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
        if (!group->default_domain) {
                group->default_domain = __iommu_domain_alloc(dev->bus,
                                                             IOMMU_DOMAIN_DMA);
-               group->domain = group->default_domain;
+               if (!group->domain)
+                       group->domain = group->default_domain;
        }
 
        ret = iommu_group_add_device(group, dev);