bond: Simply bond sysfs group creation

This patch delegates the work of creating the sysfs groups
to the netdev layer and ultimately to the device layer.  This
closes races between uevents.
Signed-off-by: NEric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -2011,7 +2011,6 @@ static void bond_uninit(struct net_device *bond_dev)
 	struct bonding *bond = netdev_priv(bond_dev);
 
 	bond_deinit(bond_dev);
-	bond_destroy_sysfs_entry(bond);
 
 	if (bond->wq)
 		destroy_workqueue(bond->wq);
@@ -3457,9 +3456,6 @@ static int bond_event_changename(struct bonding *bond)
 	bond_remove_proc_entry(bond);
 	bond_create_proc_entry(bond);
 
-	bond_destroy_sysfs_entry(bond);
-	bond_create_sysfs_entry(bond);
-
 	return NOTIFY_DONE;
 }
 
@@ -5078,6 +5074,7 @@ static int bond_init(struct net_device *bond_dev)
 	bond_create_proc_entry(bond);
 	list_add_tail(&bond->bond_list, &bond_dev_list);
 
+	bond_prepare_sysfs_group(bond);
 	return 0;
 }
 
@@ -5120,15 +5117,9 @@ int bond_create(const char *name)
 	if (res < 0)
 		goto out_bond;
 
-	res = bond_create_sysfs_entry(netdev_priv(bond_dev));
-	if (res < 0)
-		goto out_unreg;
-
 	rtnl_unlock();
 	return 0;
 
-out_unreg:
-	unregister_netdevice(bond_dev);
 out_bond:
 	bond_deinit(bond_dev);
 out_netdev:

drivers/net/bonding/bond_sysfs.c

@@ -1616,24 +1616,8 @@ void bond_destroy_sysfs(void)
  * Initialize sysfs for each bond.  This sets up and registers
  * the 'bondctl' directory for each individual bond under /sys/class/net.
  */
-int bond_create_sysfs_entry(struct bonding *bond)
+void bond_prepare_sysfs_group(struct bonding *bond)
 {
-	struct net_device *dev = bond->dev;
-	int err;
-
-	err = sysfs_create_group(&(dev->dev.kobj), &bonding_group);
-	if (err)
-		pr_emerg("eek! didn't create group!\n");
-
-	return err;
-}
-/*
- * Remove sysfs entries for each bond.
- */
-void bond_destroy_sysfs_entry(struct bonding *bond)
-{
-	struct net_device *dev = bond->dev;
-
-	sysfs_remove_group(&(dev->dev.kobj), &bonding_group);
+	bond->dev->sysfs_groups[0] = &bonding_group;
 }
 

drivers/net/bonding/bonding.h

@@ -331,8 +331,7 @@ int bond_create(const char *name);
 int  bond_release_and_destroy(struct net_device *bond_dev, struct net_device *slave_dev);
 int bond_create_sysfs(void);
 void bond_destroy_sysfs(void);
-void bond_destroy_sysfs_entry(struct bonding *bond);
-int bond_create_sysfs_entry(struct bonding *bond);
+void bond_prepare_sysfs_group(struct bonding *bond);
 int bond_create_slave_symlinks(struct net_device *master, struct net_device *slave);
 void bond_destroy_slave_symlinks(struct net_device *master, struct net_device *slave);
 int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev);