netdev - Re: [PATCH] 8139cp: allow to set mac address on running device

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Message-ID: <49BA616B.5080902@pobox.com>
Date:	Fri, 13 Mar 2009 09:36:43 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Ivan Vecera <ivecera@...hat.com>
CC:	Jiri Pirko <jpirko@...hat.com>,
	Michal Schmidt <mschmidt@...hat.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] 8139cp: allow to set mac address on running device

Ivan Vecera wrote:
> Jiri Pirko wrote:
>> Fri, Mar 13, 2009 at 10:01:21AM CET, ivecera@...hat.com wrote:
>>> Jiri Pirko wrote:
>>>> Thu, Mar 12, 2009 at 06:11:21PM CET, mschmidt@...hat.com wrote:
>>>>> On Thu, 12 Mar 2009 17:27:31 +0100
>>>>> Jiri Pirko <jpirko@...hat.com> wrote:
>>>>>
>>>>>> +	cpw32_f(MAC0 + 0, le32_to_cpu (*(__le32 *) (dev->dev_addr +
>>>>>> 0)));
>>>>>> +	cpw32_f(MAC0 + 4, le32_to_cpu (*(__le32 *) (dev->dev_addr +
>>>>>> 4)));
>>>>> You're writing to the card, so using *_to_cpu looks suspicious.
>>>> Well, I'm using the same approach as it is already done in function
>>>> cp_init_hw(). Quote:
>>>>
>>>>  /* Restore our idea of the MAC address. */
>>>>  cpw32_f (MAC0 + 0, le32_to_cpu (*(__le32 *) (dev->dev_addr + 0)));
>>>>  cpw32_f (MAC0 + 4, le32_to_cpu (*(__le32 *) (dev->dev_addr + 4)));
>>>>
>>> Yes, that's right but I would use more cleaner approach:
>>> ===
>>> u32 low, high;
>>> low  = addr[0] | (addr[1] << 8) | (addr[2] << 16) | (addr[3] << 24);
>>> high = addr[4] | (addr[5] << 8);
>>> cpw32_f(MAC0 + 0, low);
>>> cpw32_f(MAC0 + 4, high);
>>> ===
>> Well, I have no problem with this (in fact I like this more). I just wanted to
>> stay consistent to existing code. Maybe it would be good to change this chunk
>> of code in cp_init_hw() too, don't you think?
> Yes, you're right.

The existing code is correct, and works.  How about just leaving it alone?

You can grep around and see other drivers doing this when necessary, too.

	Jeff



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