netdev - Re: [RFC PATCH 12/16] dsa: Make mdio bus optional

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Message-ID: <87inxz5z4e.fsf@ketchup.mtl.sfl>
Date:	Fri, 27 May 2016 10:55:45 -0400
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	John Crispin <john@...ozen.org>, Bryan.Whitehead@...rochip.com,
	Andrew Lunn <andrew@...n.ch>
Subject: Re: [RFC PATCH 12/16] dsa: Make mdio bus optional

Hi Andrew,

Andrew Lunn <andrew@...n.ch> writes:

> -	mdiobus_unregister(ds->slave_mii_bus);
> +	if (ds->slave_mii_bus && ds->drv->phy_read)
> +		mdiobus_unregister(ds->slave_mii_bus);

So if a driver registered the slave MII bus itself, it may have
unregistered it itself as well, so checking ds->slave_mii_bus is OK
(assuming the driver correctly zero'ed it).

But is it necessary to check ds->drv->phy_read?

Thanks,

        Vivien