--- zzzz-none-000/linux-2.6.39.4/drivers/net/bonding/bond_sysfs.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-arm-6490-729/linux-2.6.39.4/drivers/net/bonding/bond_sysfs.c	2021-11-10 13:23:10.000000000 +0000
@@ -227,6 +227,12 @@
 	struct net_device *dev;
 	struct bonding *bond = to_bond(d);
 
+	/* Quick sanity check -- is the bond interface up? */
+	if (!(bond->dev->flags & IFF_UP)) {
+		pr_warning("%s: doing slave updates when interface is down.\n",
+			   bond->dev->name);
+	}
+
 	if (!rtnl_trylock())
 		return restart_syscall();