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[Qemu-devel] [PATCH 1/1] vfio iommu type1: WARN_ON if notifier block is
From: |
Kirti Wankhede |
Subject: |
[Qemu-devel] [PATCH 1/1] vfio iommu type1: WARN_ON if notifier block is not unregistered |
Date: |
Tue, 6 Dec 2016 02:38:20 +0530 |
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 <address@hidden>
Signed-off-by: Neo Jia <address@hidden>
Change-Id: I75fd0a40e582a144fe7a037c7140d3513e8ff030
---
drivers/vfio/vfio_iommu_type1.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 023fba7b8d5a..37871ee0c0c5 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -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 venfor driver must unregister notifier */
+ WARN_ON(iommu->notifier.head);
}
static void vfio_iommu_type1_detach_group(void *iommu_data,
--
2.7.0
- [Qemu-devel] [PATCH 1/1] vfio iommu type1: WARN_ON if notifier block is not unregistered,
Kirti Wankhede <=