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Diffstat (limited to 'drivers/iommu/iommu.c')
-rw-r--r--drivers/iommu/iommu.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3de5c0bcb5cc..69fef991c651 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1303,6 +1303,9 @@ int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
int ret;
group = iommu_group_get(dev);
+ if (!group)
+ return -ENODEV;
+
/*
* Lock the group to make sure the device-count doesn't
* change while we are attaching
@@ -1341,6 +1344,8 @@ void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
struct iommu_group *group;
group = iommu_group_get(dev);
+ if (!group)
+ return;
mutex_lock(&group->mutex);
if (iommu_group_device_count(group) != 1) {

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