linux-kernel - Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with phy_*

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Date: Wed, 17 Jan 2024 00:21:27 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Tim Menninger <tmenninger@...estorage.com>
Cc: f.fainelli@...il.com, olteanv@...il.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: mv88e6xxx: Make *_c45 callbacks agree with
 phy_*_c45 callbacks

> Hi Andrew,
> 
> It bubbles up as EIO (the translation happens in get_phy_c45_ids when
> get_phy_c45_devs_in_pkg fails) and ultimately causes the probe to fail.
> 
> The EIO causes the scan to stop and fail immediately - the way I read
> mdiobus_scan_bus_c45, only ENODEV is permissible.

O.K. At minimum, this should be added to the commit message.

However, i'm wondering if this is the correct fix. I would prefer that
the scan code just acts on the -EOPNOTSUPP the same was as
-ENODEV. Maybe the error code from phy_c45_probe_present() should be
returned as is. And mdiobus_scan_bus_c45() is extended to handle
-EOPNOTSUPP ?

	    Andrew