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iommufd: Add iommufd_lock_obj() around the auto-domains hwpts

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A later patch will require this locking - currently under the ioas mutex
the hwpt can not have a 0 reference and be on the list.

Link: https://lore.kernel.org/r/2-v3-ae9c2975a131+2e1e8-iommufd_hwpt_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2023-03-01 15:30:19 -04:00
parent 085fcc7eb7
commit 7214c1c85f
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/iommufd/device.c
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@ -282,7 +282,10 @@ static int iommufd_device_auto_get_domain(struct iommufd_device *idev,
if (!hwpt->auto_domain)
continue;
if (!iommufd_lock_obj(&hwpt->obj))
continue;
rc = iommufd_device_do_attach(idev, hwpt);
iommufd_put_object(&hwpt->obj);
/*
* -EINVAL means the domain is incompatible with the device.