netdev - Re: [PATCH net-next 07/19] net: usb: aqc111: Add support for getting and setting of MAC address

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Date:   Tue, 9 Oct 2018 14:34:36 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "David S . Miller" <davem@...emloft.net>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dmitry Bezrukov <Dmitry.Bezrukov@...antia.com>
Subject: Re: [PATCH net-next 07/19] net: usb: aqc111: Add support for getting
 and setting of MAC address

Hi Andrew,

>> +	if (ret < 0)
>> +		goto out;
>> +
>> +	memcpy(dev->net->dev_addr, buf, ETH_ALEN);
>> +	memcpy(dev->net->perm_addr, dev->net->dev_addr, ETH_ALEN);
> 
> Is this really the permanent address? If i call aqc111_set_mac_addr()
> followed by aqc111_get_mac() i still get what is in the OTP EEPROM?

Thats actually a confusion with function name here.
Think its better to name it aqc111_init_mac() since it gets called
only once on bind.

It really initializes perm_addr once, thus standard ndev callback will give
the perm mac you want.

> 
> You initialized it above as {0}. You don't need to memset it here.
> 
>> +	ret = aqc111_get_mac(dev, buf);
> 
> Do you even need to zero it? If aqc111_get_mac() fails, it will be
> left undefined, but you fail the bind anyway.

We even don't need this `buf` here at all. We'll move it into
above init_mac function.

BR, Igor