[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

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