[PATCH 2/2] powerpc/iommu: check dev->iommu_group before remove a device from iommu_group

[Wei Yang]

---
 arch/powerpc/kernel/iommu.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index b20ff17..5abf7c3 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -1149,7 +1149,8 @@ static int iommu_bus_notifier(struct notifier_block *nb,
 	case BUS_NOTIFY_ADD_DEVICE:
 		return iommu_add_device(dev);
 	case BUS_NOTIFY_DEL_DEVICE:
-		iommu_del_device(dev);
+		if (dev->iommu_group)
+			iommu_del_device(dev);
 		return 0;
 	default:
 		return 0;
-- 
1.7.5.4