iommufd: Simplify iommufd_device_remove_vdev()

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Peiyang reports that this function indirectly includes a fault injection
point through iommufd_get_object() that was intended to cover the uAPI use
of object IDs, not in places like this that cannot fail.

On deeper inspection this can be written using a dedicated helper to
obtain a users refcount relying entirely on the xa locking instead of
going through the whole get/put scheme. The new helper doesn't need the
fault injection point.

Fixes: 850f14f5b9 ("iommufd: Destroy vdevice on idevice destroy")
Link: https://patch.msgid.link/r/0-v1-719003d53a5b+38b-iommufd_fault_inj_vdev_jgg@nvidia.com
Reported-by: Peiyang He <peiyang_he@smail.nju.edu.cn>
Closes: https://lore.kernel.org/r/870BB9ADBBEDDD1A+37c5bfab-ad32-4fc5-a302-57c81a8432b5@smail.nju.edu.cn
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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This commit is contained in:

Jason Gunthorpe 2026-07-13 14:09:46 -03:00

parent 29f3965834

commit 8062148046

3 changed files with 24 additions and 18 deletions

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13

drivers/iommu/iommufd/device.c

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9

drivers/iommu/iommufd/iommufd_private.h

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20

drivers/iommu/iommufd/main.c

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