netdev - Re: [PATCH net] net: mdio-mux: fix C45 access returning -EIO after API change

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Date: Tue, 17 Oct 2023 15:44:58 +0200
From: Andrew Lunn <andrew@...n.ch>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Michael Walle <michael@...le.cc>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: mdio-mux: fix C45 access returning -EIO after
 API change

> Maybe make these conditional on the parent bus implementing the c45
> read/write ops?

And optionally, for net-next, make the c22 read/write ops conditional
on the parent bus having C22 as well. Its a bit of a corner case, but
there are a couple of MDIO bus masters which are C45 only.

Not having C45 is however very common, so we should make this
conditional as part of the fix.

      Andrew