Merge branch 'vrf-cleanups-part-2'

Nikolay Aleksandrov says:

====================
vrf: cleanups part 2

This is the next part of vrf cleanups, patch 1 drops the SLAB_PANIC
when creating kmem cache since it's handled, patch 02 removes a slave
duplicate check which is already done by the lower/upper code, patch 3
moves the ndo_add_slave code around a bit so we can drop an error
label and patch 4 drops the master device checks which are unnecessary
because the ops are taken from the master device itself so it can't be
different.
====================

Acked-by: David Ahern <dsa@cumulusnetworks.com>

drivers/net/vrf.c

@@ -352,7 +352,6 @@ static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
 {
 	struct net_vrf_dev *vrf_ptr = kmalloc(sizeof(*vrf_ptr), GFP_KERNEL);
 	struct slave *slave = kzalloc(sizeof(*slave), GFP_KERNEL);
-	struct slave *duplicate_slave;
 	struct net_vrf *vrf = netdev_priv(dev);
 	struct slave_queue *queue = &vrf->queue;
 	int ret = -ENOMEM;
@@ -361,42 +360,31 @@ static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
 		goto out_fail;
 
 	slave->dev = port_dev;
-
 	vrf_ptr->ifindex = dev->ifindex;
 	vrf_ptr->tb_id = vrf->tb_id;
 
-	duplicate_slave = __vrf_find_slave_dev(queue, port_dev);
-	if (duplicate_slave) {
-		ret = -EBUSY;
-		goto out_fail;
-	}
-
-	__vrf_insert_slave(queue, slave);
-
 	/* register the packet handler for slave ports */
 	ret = netdev_rx_handler_register(port_dev, vrf_handle_frame, dev);
 	if (ret) {
 		netdev_err(port_dev,
 			   "Device %s failed to register rx_handler\n",
 			   port_dev->name);
-		goto out_remove;
+		goto out_fail;
 	}
 
 	ret = netdev_master_upper_dev_link(port_dev, dev);
 	if (ret < 0)
 		goto out_unregister;
 
 	port_dev->flags |= IFF_SLAVE;
-
+	__vrf_insert_slave(queue, slave);
 	rcu_assign_pointer(port_dev->vrf_ptr, vrf_ptr);
 	cycle_netdev(port_dev);
 
 	return 0;
 
 out_unregister:
 	netdev_rx_handler_unregister(port_dev);
-out_remove:
-	__vrf_remove_slave(queue, slave);
 out_fail:
 	kfree(vrf_ptr);
 	kfree(slave);
@@ -405,8 +393,7 @@ static int do_vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
 
 static int vrf_add_slave(struct net_device *dev, struct net_device *port_dev)
 {
-	if (!netif_is_vrf(dev) || netif_is_vrf(port_dev) ||
-	    vrf_is_slave(port_dev))
+	if (netif_is_vrf(port_dev) || vrf_is_slave(port_dev))
 		return -EINVAL;
 
 	return do_vrf_add_slave(dev, port_dev);
@@ -443,9 +430,6 @@ static int do_vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
 
 static int vrf_del_slave(struct net_device *dev, struct net_device *port_dev)
 {
-	if (!netif_is_vrf(dev))
-		return -EINVAL;
-
 	return do_vrf_del_slave(dev, port_dev);
 }
 
@@ -649,7 +633,7 @@ static int __init vrf_init_module(void)
 	vrf_dst_ops.kmem_cachep =
 		kmem_cache_create("vrf_ip_dst_cache",
 				  sizeof(struct rtable), 0,
-				  SLAB_HWCACHE_ALIGN | SLAB_PANIC,
+				  SLAB_HWCACHE_ALIGN,
 				  NULL);
 
 	if (!vrf_dst_ops.kmem_cachep)