netdev - Re: [PATCH 1/5] bonding: mc addresses don't get deleted on enslave failure

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Date:	Thu, 18 Apr 2013 09:58:00 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
cc:	netdev@...r.kernel.org, andy@...yhouse.net, davem@...emloft.net
Subject: Re: [PATCH 1/5] bonding: mc addresses don't get deleted on enslave failure

Nikolay Aleksandrov <nikolay@...hat.com> wrote:

>Add dev_mc_del after err_detach as that's the first error path
>after they're added. The main issue is the mc addresses' refcount
>which only gets bumped up.
>
>Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>

	All 5 of these patches look good to me.  The only minor nits are
that the above description says "dev_mc_del," but the actual function
call added is bond_mc_list_flush (which in turn does call dev_mc_dev),
and that this patch (#1) modifies the lacpdu_multicast variable
initialization, which isn't really necessary for the bug fix.

	-J


>---
> drivers/net/bonding/bond_main.c | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index a61a760..dc0153b 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -1523,6 +1523,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> 	struct sockaddr addr;
> 	int link_reporting;
> 	int res = 0;
>+	u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
>
> 	if (!bond->params.use_carrier &&
> 	    slave_dev->ethtool_ops->get_link == NULL &&
>@@ -1726,12 +1727,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
> 		netif_addr_unlock_bh(bond_dev);
> 	}
>
>-	if (bond->params.mode == BOND_MODE_8023AD) {
>+	if (bond->params.mode == BOND_MODE_8023AD)
> 		/* add lacpdu mc addr to mc list */
>-		u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR;
>-
> 		dev_mc_add(slave_dev, lacpdu_multicast);
>-	}
>
> 	bond_add_vlans_on_slave(bond, slave_dev);
>
>@@ -1901,6 +1899,11 @@ err_dest_symlinks:
> 	bond_destroy_slave_symlinks(bond_dev, slave_dev);
>
> err_detach:
>+	if (!USES_PRIMARY(bond->params.mode)) {
>+		netif_addr_lock_bh(bond_dev);
>+		bond_mc_list_flush(bond_dev, slave_dev);
>+		netif_addr_unlock_bh(bond_dev);
>+	}
> 	write_lock_bh(&bond->lock);
> 	bond_detach_slave(bond, new_slave);
> 	write_unlock_bh(&bond->lock);
>-- 
>1.8.1.4

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com

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