int dmar_iommu_notify_scope_dev()

in intel/iommu.c [4067:4135]

• 64 lines of code
• 17 McCabe index (conditional complexity)

int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
{
	int ret;
	struct dmar_rmrr_unit *rmrru;
	struct dmar_atsr_unit *atsru;
	struct dmar_satc_unit *satcu;
	struct acpi_dmar_atsr *atsr;
	struct acpi_dmar_reserved_memory *rmrr;
	struct acpi_dmar_satc *satc;

	if (!intel_iommu_enabled && system_state >= SYSTEM_RUNNING)
		return 0;

	list_for_each_entry(rmrru, &dmar_rmrr_units, list) {
		rmrr = container_of(rmrru->hdr,
				    struct acpi_dmar_reserved_memory, header);
		if (info->event == BUS_NOTIFY_ADD_DEVICE) {
			ret = dmar_insert_dev_scope(info, (void *)(rmrr + 1),
				((void *)rmrr) + rmrr->header.length,
				rmrr->segment, rmrru->devices,
				rmrru->devices_cnt);
			if (ret < 0)
				return ret;
		} else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
			dmar_remove_dev_scope(info, rmrr->segment,
				rmrru->devices, rmrru->devices_cnt);
		}
	}

	list_for_each_entry(atsru, &dmar_atsr_units, list) {
		if (atsru->include_all)
			continue;

		atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
		if (info->event == BUS_NOTIFY_ADD_DEVICE) {
			ret = dmar_insert_dev_scope(info, (void *)(atsr + 1),
					(void *)atsr + atsr->header.length,
					atsr->segment, atsru->devices,
					atsru->devices_cnt);
			if (ret > 0)
				break;
			else if (ret < 0)
				return ret;
		} else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
			if (dmar_remove_dev_scope(info, atsr->segment,
					atsru->devices, atsru->devices_cnt))
				break;
		}
	}
	list_for_each_entry(satcu, &dmar_satc_units, list) {
		satc = container_of(satcu->hdr, struct acpi_dmar_satc, header);
		if (info->event == BUS_NOTIFY_ADD_DEVICE) {
			ret = dmar_insert_dev_scope(info, (void *)(satc + 1),
					(void *)satc + satc->header.length,
					satc->segment, satcu->devices,
					satcu->devices_cnt);
			if (ret > 0)
				break;
			else if (ret < 0)
				return ret;
		} else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
			if (dmar_remove_dev_scope(info, satc->segment,
					satcu->devices, satcu->devices_cnt))
				break;
		}
	}

	return 0;
}