netdev - Re: [PATCH 4/4] asix: Add a new driver for the AX88172A

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Date:	Fri, 6 Jul 2012 18:37:35 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Christian Riesch <christian.riesch@...cron.at>
CC:	<netdev@...r.kernel.org>, Oliver Neukum <oneukum@...e.de>,
	Eric Dumazet <edumazet@...gle.com>,
	Allan Chou <allan@...x.com.tw>,
	Mark Lord <kernel@...savvy.com>,
	Grant Grundler <grundler@...omium.org>,
	Ming Lei <tom.leiming@...il.com>,
	Michael Riesch <michael@...sch.at>
Subject: Re: [PATCH 4/4] asix: Add a new driver for the AX88172A

On Fri, 2012-07-06 at 13:33 +0200, Christian Riesch wrote:
> The Asix AX88172A is a USB 2.0 Ethernet interface that supports both an
> internal PHY as well as an external PHY (connected via MII).
> 
> This patch adds a driver for the AX88172A and provides support for
> both modes and supports phylib.
[...]
> +static int ax88172a_init_mdio(struct usbnet *dev)
> +{
> +	struct ax88172a_private *priv =
> +		(struct ax88172a_private *)dev->driver_priv;
> +	int ret, i;
> +
> +	priv->mdio = mdiobus_alloc();
> +	if (!priv->mdio) {
> +		dbg("Could not allocate MDIO bus");
> +		return -1;
> +	}
> +
> +	priv->mdio->priv = (void *)dev;
> +	priv->mdio->read = &asix_mdio_bus_read;
> +	priv->mdio->write = &asix_mdio_bus_write;
> +	priv->mdio->name = "Asix MDIO Bus";
> +	snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "asix-%s",
> +		 dev_name(dev->net->dev.parent));
[...]

I think you need to ensure that the bus identifier is unique throughout
its lifetime, but net devices can be renamed and that could lead to a
collision.  Perhaps you could use the ifindex or the USB device path
(though that might be too long).

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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