greybus: interface: add active state flag

Add active state flag to avoid deactivating an interface which is
already off.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/interface.c

@@ -409,6 +409,8 @@ int gb_interface_activate(struct gb_interface *intf)
 	if (ret)
 		return ret;
 
+	intf->active = true;
+
 	return 0;
 }
 
@@ -419,7 +421,12 @@ int gb_interface_activate(struct gb_interface *intf)
  */
 void gb_interface_deactivate(struct gb_interface *intf)
 {
+	if (!intf->active)
+		return;
+
 	gb_interface_route_destroy(intf);
+
+	intf->active = false;
 }
 
 /*

drivers/staging/greybus/interface.h

@@ -43,6 +43,7 @@ struct gb_interface {
 
 	bool disconnected;
 	bool ejected;
+	bool active;
 	bool enabled;
 };
 #define to_gb_interface(d) container_of(d, struct gb_interface, dev)