diff --git a/include/linux/libata.h b/include/linux/libata.h
index 505160a..d33e703 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -420,6 +420,7 @@
 extern unsigned int ata_dev_classify(struct ata_taskfile *tf);
 extern void ata_dev_id_string(u16 *id, unsigned char *s,
 			      unsigned int ofs, unsigned int len);
+extern void ata_dev_config(struct ata_port *ap, unsigned int i);
 extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
 extern void ata_bmdma_start (struct ata_queued_cmd *qc);
 extern void ata_bmdma_stop(struct ata_port *ap);