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vfio iommu type1: WARN_ON if notifier block is not unregistered

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mdev vendor driver should unregister the iommu notifier since the vfio
iommu can persist beyond the attachment of the mdev group. WARN_ON will
show warning if vendor driver doesn't unregister the notifier and is
forced to follow the implementations steps.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Neo Jia <cjia@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2016-12-06 02:38:20 +05:30 committed by Alex Williamson
parent 2fc1bec158
commit 3cedd7d75f
1 changed files with 2 additions and 0 deletions
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drivers/vfio/vfio_iommu_type1.c
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@ -1361,6 +1361,8 @@ static void vfio_sanity_check_pfn_list(struct vfio_iommu *iommu)
if (WARN_ON(!RB_EMPTY_ROOT(&dma->pfn_list)))
break;
}
/* mdev vendor driver must unregister notifier */
WARN_ON(iommu->notifier.head);
}
static void vfio_iommu_type1_detach_group(void *iommu_data,