static int parse_feature_fiu()

in dfl.c [1124:1169]

• 32 lines of code
• 7 McCabe index (conditional complexity)

static int parse_feature_fiu(struct build_feature_devs_info *binfo,
			     resource_size_t ofst)
{
	int ret = 0;
	u32 offset;
	u16 id;
	u64 v;

	if (is_feature_dev_detected(binfo)) {
		build_info_complete(binfo);

		ret = build_info_commit_dev(binfo);
		if (ret)
			return ret;

		ret = build_info_prepare(binfo, binfo->start + ofst,
					 binfo->len - ofst);
		if (ret)
			return ret;
	}

	v = readq(binfo->ioaddr + DFH);
	id = FIELD_GET(DFH_ID, v);

	/* create platform device for dfl feature dev */
	ret = build_info_create_dev(binfo, dfh_id_to_type(id));
	if (ret)
		return ret;

	ret = create_feature_instance(binfo, 0, 0, 0);
	if (ret)
		return ret;
	/*
	 * find and parse FIU's child AFU via its NEXT_AFU register.
	 * please note that only Port has valid NEXT_AFU pointer per spec.
	 */
	v = readq(binfo->ioaddr + NEXT_AFU);

	offset = FIELD_GET(NEXT_AFU_NEXT_DFH_OFST, v);
	if (offset)
		return parse_feature_afu(binfo, offset);

	dev_dbg(binfo->dev, "No AFUs detected on FIU %d\n", id);

	return ret;
}