sili_port_signature
ap->ap_type = sili_port_signature(ap, NULL, sig);
if (sili_port_signature(ap, NULL, sig) != ap->ap_type) {
int sili_port_signature(struct sili_port *ap, struct ata_port *at,
at->at_type = sili_port_signature(ap, at, sig);
if (sili_port_signature(ap, at, sig) != at->at_type) {