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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
