> +static int handle_deferred_device(struct device *dev, > + struct iommu_domain *domain) Nitick: we usually use double tab indents (or indents to after the opening brace) for multi-line prototyped. > + if (!is_kdump_kernel()) > + return 0; > + > + if (unlikely(ops->is_attach_deferred && > + ops->is_attach_deferred(domain, dev))) > + return iommu_attach_device(domain, dev); And for multi-line conditionals we also use two-tab indents.