If acpihid_device_group() finds an existing group for the relevant
devid, it should be taking an additional reference on that group.

Signed-off-by: Robin Murphy <[email protected]>
---
 drivers/iommu/amd_iommu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 754595ee11b6..4ef05691ceb1 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -373,6 +373,8 @@ static struct iommu_group *acpihid_device_group(struct 
device *dev)
 
        if (!entry->group)
                entry->group = generic_device_group(dev);
+       else
+               __iommu_group_get(entry->group);
 
        return entry->group;
 }
-- 
2.10.2.dirty

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