linux-kernel - Re: [PATCH] bonding: check for assigned mac before adopting the slaves mac address

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Message-ID: <AANLkTi=+jMkrgNjVQvOOn_zURiJ4rXu5LL9eA4o0T9db@mail.gmail.com>
Date:	Wed, 1 Dec 2010 10:25:19 -0800
From:	David Strand <dpstrand@...il.com>
To:	Jay Vosburgh <fubar@...ibm.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bonding: check for assigned mac before adopting the
 slaves mac address

On Thu, Nov 25, 2010 at 7:26 PM, Jay Vosburgh <fubar@...ibm.com> wrote:
>
>        Ok, fair enough.  If we want to get back to the original
> behavior, however, your patch should only test for zero MAC address
> instead of testing for zero MAC address in addition to first slave.
>
>        -J
>
> ---
>        -Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
>

Understood, that makes sense. The updated patch is below.

---
diff -uprN a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
--- a/drivers/net/bonding/bond_main.c	2010-11-24 11:36:58.125640000 -0800
+++ b/drivers/net/bonding/bond_main.c	2010-12-01 10:12:33.728640001 -0800
@@ -1576,7 +1576,7 @@ int bond_enslave(struct net_device *bond

 	/* If this is the first slave, then we need to set the master's hardware
 	 * address to be the same as the slave's. */
-	if (bond->slave_cnt == 0)
+	if (is_zero_ether_addr(bond->dev->dev_addr))
 		memcpy(bond->dev->dev_addr, slave_dev->dev_addr,
 		       slave_dev->addr_len);
--
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