netdev - [PATCH REPOST 4/4] bonding: fix enslavement error unwinds

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Message-ID: <21092.1209776762@death>
Date:	Fri, 02 May 2008 18:06:02 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	David Miller <davem@...emloft.net>
cc:	netdev@...r.kernel.org, jgarzik@...ox.com
Subject: [PATCH REPOST 4/4] bonding: fix enslavement error unwinds 


	As part of:

commit c2edacf80e155ef54ae4774379d461b60896bc2e
Author: Jay Vosburgh <fubar@...ibm.com>
Date:   Mon Jul 9 10:42:47 2007 -0700

    bonding / ipv6: no addrconf for slaves separately from master

two steps were rearranged in the enslavement process: netdev_set_master
is now before the call to dev_open to open the slave.

	This patch updates the error cases and unwind process at the
end of bond_enslave to match the new order.  Without this patch, it is
possible for the enslavement to fail, but leave the slave with IFF_SLAVE
set in its flags.

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
---
 drivers/net/bonding/bond_main.c |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3977760..b99ccd2 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1425,13 +1425,13 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	res = netdev_set_master(slave_dev, bond_dev);
 	if (res) {
 		dprintk("Error %d calling netdev_set_master\n", res);
-		goto err_close;
+		goto err_restore_mac;
 	}
 	/* open the slave since the application closed it */
 	res = dev_open(slave_dev);
 	if (res) {
 		dprintk("Openning slave %s failed\n", slave_dev->name);
-		goto err_restore_mac;
+		goto err_unset_master;
 	}

 	new_slave->dev = slave_dev;
@@ -1444,7 +1444,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		 */
 		res = bond_alb_init_slave(bond, new_slave);
 		if (res) {
-			goto err_unset_master;
+			goto err_close;
 		}
 	}

@@ -1619,7 +1619,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)

 	res = bond_create_slave_symlinks(bond_dev, slave_dev);
 	if (res)
-		goto err_unset_master;
+		goto err_close;

 	printk(KERN_INFO DRV_NAME
 	       ": %s: enslaving %s as a%s interface with a%s link.\n",
@@ -1631,12 +1631,12 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 	return 0;

 /* Undo stages on error */
-err_unset_master:
-	netdev_set_master(slave_dev, NULL);
-
 err_close:
 	dev_close(slave_dev);

+err_unset_master:
+	netdev_set_master(slave_dev, NULL);
+
 err_restore_mac:
 	if (!bond->params.fail_over_mac) {
 		memcpy(addr.sa_data, new_slave->perm_hwaddr, ETH_ALEN);
-- 
1.5.2.4

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