netdev - Re: [PATCH net-next 14/19] net: usb: aqc111: Implement set_rx

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Date:   Mon, 8 Oct 2018 13:49:55 +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 14/19] net: usb: aqc111: Implement set_rx_mode
 callback

Hi Andrew,

>> +{
>> +	struct usbnet *dev = netdev_priv(net);
>> +	struct aqc111_data *aqc111_data = (struct aqc111_data *)dev->data[0];
> 
>> +	u8 *m_filter = ((u8 *)dev->data) + 12;
> 
> Please could you explain is.

Oh, that was a legacy code, the idea is it used spare area in dev->data array to
keep permanently 8 bytes for mcast filter request.

But the truth is usbnet_write anyway preallocates the data buffer and copies the data in there.

Therefore its really better to just allocate m_filter on stack to make the code clean.

Regards,
  Igor