diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 7a7f88b3fa2b..931d0081169b 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2094,13 +2094,13 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 		if (ap->flags & ATA_FLAG_EM)
 			ap->em_message_type = hpriv->em_msg_type;
 
-		ahci_mark_external_port(ap);
-
-		ahci_update_initial_lpm_policy(ap);
-
 		/* disabled/not-implemented port */
-		if (!(hpriv->port_map & (1 << i)))
+		if (!(hpriv->port_map & (1 << i))) {
 			ap->ops = &ata_dummy_port_ops;
+		} else {
+			ahci_mark_external_port(ap);
+			ahci_update_initial_lpm_policy(ap);
+		}
 	}
 
 	/* apply workaround for ASUS P5W DH Deluxe mainboard */