diff --git a/include/linux/libata.h b/include/linux/libata.h
index 74786c3..f11ba27 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -649,6 +649,7 @@
 extern int ata_pci_clear_simplex(struct pci_dev *pdev);
 #endif /* CONFIG_PCI */
 extern int ata_device_add(const struct ata_probe_ent *ent);
+extern void ata_port_detach(struct ata_port *ap);
 extern void ata_host_set_remove(struct ata_host_set *host_set);
 extern int ata_scsi_detect(struct scsi_host_template *sht);
 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);