> From: Nicolin Chen <nicol...@nvidia.com>
> Sent: Tuesday, October 22, 2024 8:19 AM
>
> +static struct iommufd_hwpt_nested *
> +iommufd_hwpt_nested_alloc_for_viommu(struct iommufd_viommu
> *viommu,
> + const struct iommu_user_data *user_data)
probably "_for" can be skipped to reduce the name length
> +{
> + struct iommufd_hwpt_nested *hwpt_nested;
> + struct iommufd_hw_pagetable *hwpt;
> + int rc;
> +
> + if (!viommu->ops || !viommu->ops->domain_alloc_nested)
> + return ERR_PTR(-EOPNOTSUPP);
> +
> + hwpt_nested = __iommufd_object_alloc(
> + viommu->ictx, hwpt_nested, IOMMUFD_OBJ_HWPT_NESTED,
> common.obj);
> + if (IS_ERR(hwpt_nested))
> + return ERR_CAST(hwpt_nested);
> + hwpt = &hwpt_nested->common;
> +
> + hwpt_nested->viommu = viommu;
> + hwpt_nested->parent = viommu->hwpt;
> + refcount_inc(&viommu->obj.users);
> +
> + hwpt->domain = viommu->ops->domain_alloc_nested(viommu,
> user_data);
> + if (IS_ERR(hwpt->domain)) {
> + rc = PTR_ERR(hwpt->domain);
> + hwpt->domain = NULL;
> + goto out_abort;
> + }
> + hwpt->domain->owner = viommu->iommu_dev->ops;
> +
> + if (WARN_ON_ONCE(hwpt->domain->type !=
> IOMMU_DOMAIN_NESTED)) {
> + rc = -EINVAL;
> + goto out_abort;
> + }
> + return hwpt_nested;
> +
> +out_abort:
> + iommufd_object_abort_and_destroy(viommu->ictx, &hwpt->obj);
> + return ERR_PTR(rc);
> +}
> +
looks there missed a check on flags in this path.
