[PATCH 2/5] iommu/arm-smmu: Fix group refcounting

[Robin Murphy]

When arm_smmu_device_group() finds an existing group due to Stream ID
aliasing, it should be taking an additional reference on that group.

Reported-by: Sricharan R <sricharan at codeaurora.org>
Signed-off-by: Robin Murphy <robin.murphy at arm.com>
---
 drivers/iommu/arm-smmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 8f7281444551..9f760cfba4fa 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1478,7 +1478,7 @@ static struct iommu_group *arm_smmu_device_group(struct device *dev)
 	}
 
 	if (group)
-		return group;
+		return __iommu_group_get(group);
 
 	if (dev_is_pci(dev))
 		group = pci_device_group(dev);
-- 
2.10.2.dirty