[PATCH 3/5] iommu/amd: Fix group refcounting

[Robin Murphy]

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 <robin.murphy at arm.com>
---
 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