greybus: interface: hibernate UniPro link in activation error path

To be well-behaved, we should hibernate the link before disabling UniPro
in case the link has already been established (i.e. when the interface
type has been detected as UniPro or Greybus).
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Sandeep Patil <sspatil@google.com>
Reviewed-by: Patrick Titiano <ptitiano@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/interface.c

@@ -947,8 +947,15 @@ static int _gb_interface_activate(struct gb_interface *intf,
 		goto err_refclk_disable;
 
 	ret = gb_interface_activate_operation(intf, type);
-	if (ret)
-		goto err_unipro_disable;
+	if (ret) {
+		switch (*type) {
+		case GB_INTERFACE_TYPE_UNIPRO:
+		case GB_INTERFACE_TYPE_GREYBUS:
+			goto err_hibernate_link;
+		default:
+			goto err_unipro_disable;
+		}
+	}
 
 	ret = gb_interface_read_dme(intf);
 	if (ret)