bool gb_manifest_parse()

in manifest.c [452:533]

• 61 lines of code
• 12 McCabe index (conditional complexity)

bool gb_manifest_parse(struct gb_interface *intf, void *data, size_t size)
{
	struct greybus_manifest *manifest;
	struct greybus_manifest_header *header;
	struct greybus_descriptor *desc;
	struct manifest_desc *descriptor;
	struct manifest_desc *interface_desc = NULL;
	u16 manifest_size;
	u32 found = 0;
	bool result;

	/* Manifest descriptor list should be empty here */
	if (WARN_ON(!list_empty(&intf->manifest_descs)))
		return false;

	/* we have to have at _least_ the manifest header */
	if (size < sizeof(*header)) {
		dev_err(&intf->dev, "short manifest (%zu < %zu)\n",
			size, sizeof(*header));
		return false;
	}

	/* Make sure the size is right */
	manifest = data;
	header = &manifest->header;
	manifest_size = le16_to_cpu(header->size);
	if (manifest_size != size) {
		dev_err(&intf->dev, "manifest size mismatch (%zu != %u)\n",
			size, manifest_size);
		return false;
	}

	/* Validate major/minor number */
	if (header->version_major > GREYBUS_VERSION_MAJOR) {
		dev_err(&intf->dev, "manifest version too new (%u.%u > %u.%u)\n",
			header->version_major, header->version_minor,
			GREYBUS_VERSION_MAJOR, GREYBUS_VERSION_MINOR);
		return false;
	}

	/* OK, find all the descriptors */
	desc = manifest->descriptors;
	size -= sizeof(*header);
	while (size) {
		int desc_size;

		desc_size = identify_descriptor(intf, desc, size);
		if (desc_size < 0) {
			result = false;
			goto out;
		}
		desc = (struct greybus_descriptor *)((char *)desc + desc_size);
		size -= desc_size;
	}

	/* There must be a single interface descriptor */
	list_for_each_entry(descriptor, &intf->manifest_descs, links) {
		if (descriptor->type == GREYBUS_TYPE_INTERFACE)
			if (!found++)
				interface_desc = descriptor;
	}
	if (found != 1) {
		dev_err(&intf->dev, "manifest must have 1 interface descriptor (%u found)\n",
			found);
		result = false;
		goto out;
	}

	/* Parse the manifest, starting with the interface descriptor */
	result = gb_manifest_parse_interface(intf, interface_desc);

	/*
	 * We really should have no remaining descriptors, but we
	 * don't know what newer format manifests might leave.
	 */
	if (result && !list_empty(&intf->manifest_descs))
		dev_info(&intf->dev, "excess descriptors in interface manifest\n");
out:
	release_manifest_descriptors(intf);

	return result;
}