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

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Message-ID: <49BA621B.40303@redhat.com>
Date:	Fri, 13 Mar 2009 14:39:39 +0100
From:	Ivan Vecera <ivecera@...hat.com>
To:	Jeff Garzik <jgarzik@...ox.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

Jeff Garzik wrote:
> 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?
+1

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

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