libata: when restoring SControl during detach do the PMP links first

When restoring SControl during detach, PMP links should be handled
first as changing SControl of the host link can affect SCR access of
PMP links.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

drivers/ata/libata-core.c

@@ -6123,7 +6123,7 @@ static void ata_port_detach(struct ata_port *ap)
 	/* EH is now guaranteed to see UNLOADING - EH context belongs
 	 * to us.  Restore SControl and disable all existing devices.
 	 */
-	ata_for_each_link(link, ap, HOST_FIRST) {
+	ata_for_each_link(link, ap, PMP_FIRST) {
 		sata_scr_write(link, SCR_CONTROL, link->saved_scontrol & 0xff0);
 		ata_for_each_dev(dev, link, ALL)
 			ata_dev_disable(dev);