In some cases, one device may not associated with any iommu_group.
For example, not enough DMA address space.
For those devices, kernel will crash when try to remove it from an iommu_group.
This patch do the check before remove it.
Signed-off-by: Wei Yang <weiy...@linux.vnet.ibm.com>
---
drivers/iommu/iommu.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index fbe9ca7..fe41946 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -379,6 +379,9 @@ void iommu_group_remove_device(struct device *dev)
struct iommu_group *group = dev->iommu_group;
struct iommu_device *tmp_device, *device = NULL;
+ if (!group)
+ return;
+
/* Pre-notify listeners that a device is being removed. */
blocking_notifier_call_chain(&group->notifier,
IOMMU_GROUP_NOTIFY_DEL_DEVICE, dev);
--
1.7.5.4
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