28 Oct
2024
28 Oct
'24
2:49 a.m.
From: Nicolin Chen nicolinc@nvidia.com Sent: Saturday, October 26, 2024 7:50 AM
For an iommu_dev that can unplug (so far only this selftest does so), the viommu->iommu_dev pointer has no guarantee of its life cycle after it is copied from the idev->dev->iommu->iommu_dev.
Track the user count of the iommu_dev. Postpone the exit routine using a completion, if refcount is unbalanced. The refcount inc/dec will be added in the following patch.
Signed-off-by: Nicolin Chen nicolinc@nvidia.com
Reviewed-by: Kevin Tian kevin.tian@intel.com