Commit 7214c1c8 authored Mar 01, 2023 by Jason Gunthorpe

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

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>

parent 085fcc7e

drivers/iommu/iommufd/device.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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.