linux-kernel - Re: r8169 MAC addresses broken

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Date:	Tue, 04 Nov 2008 19:49:42 +0100
From:	Ivan Vecera <ivecera@...hat.com>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	Krzysztof Halasa <khc@...waw.pl>,
	Francois Romieu <romieu@...zoreil.com>,
	Simon Arlott <simon@...e.lp0.eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Edward Hsu <edward_hsu@...ltek.com.tw>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: r8169 MAC addresses broken

Jiri Slaby wrote:
> On 11/03/2008 10:04 AM, Ivan Vecera wrote:
>> Jiri Slaby wrote:
>>> On 10/28/2008 02:45 PM, Krzysztof Halasa wrote:
>>>> Jiri Slaby <jirislaby@...il.com> writes:
>>>>
>>>>>> Same thing if you unplug the battery ?
>>>>> Thanks, now it seems to be OK.
>>>> Well, perhaps reverting that patch was a bit premature?
>>> No, it helped after reverting that patch. I think we don't want defunct 2.6.28
>>> with these nics.
>> I cannot agree.
> 
> You want defunct r8169 in 2.6.28? Or cannot agree with what?
> 
>> IMO the problem was in the first version of the patch that didn't
>> check for invalid (zeroed) MAC address. In this case is necessary to power-off (desktop
>> case) or unplug the battery (notebook case).
> 
> I see no updated patch in this thread to test -- am I missing something?
Francois has fix for this problem (zeroed MAC address) in his repository:
http://git.kernel.org/?p=linux/kernel/git/romieu/netdev-2.6.git;a=commitdiff;h=9b1abbccf53ef1a1213b159d56257b535c599f07

snippet:
...
-       /* Write MAC address */
-       rtl_rar_set(tp, mac);
+       if (is_valid_ether_addr(mac))
+               rtl_rar_set(tp, mac);
...


When MAC only zeros then it is not assigned. Pulling this commit is better than reverting whole patch.

Ivan
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