iommu_deferred_attach
ret = iommu_deferred_attach(dev, domain);
iommu_deferred_attach(dev, iommu_get_domain_for_dev(dev)))
iommu_deferred_attach(dev, domain))
iommu_deferred_attach(dev, domain))
int iommu_deferred_attach(struct device *dev, struct iommu_domain *domain);