iommufd: Fix locking around hwpt allocation

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[ Upstream commit 31422dff18 ]

Due to the auto_domains mechanism the ioas->mutex must be held until
the hwpt is completely setup by iommufd_object_abort_and_destroy() or
iommufd_object_finalize().

This prevents a concurrent iommufd_device_auto_get_domain() from seeing
an incompletely initialized object through the ioas->hwpt_list.

To make this more consistent move the unlock until after finalize.

Fixes: e8d5721003 ("iommufd: Add kAPI toward external drivers for physical devices")
Link: https://lore.kernel.org/r/11-v8-6659224517ea+532-iommufd_alloc_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Jason Gunthorpe 2023-07-17 15:12:07 -03:00 • committed by Greg Kroah-Hartman

parent 68389f0c4a

commit 727a2c1402

1 changed files with 1 additions and 1 deletions

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drivers/iommu/iommufd/device.c

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