linux-kernel - Re: [PATCH net-next 1/1] net: mdio: reset PHY before attempting to access ID register

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Message-ID: <20251125184335.040f015e@kernel.org>
Date: Tue, 25 Nov 2025 18:43:35 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Buday Csaba <buday.csaba@...lan.hu>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
 Russell King <linux@...linux.org.uk>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, <netdev@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/1] net: mdio: reset PHY before attempting to
 access ID register

On Tue, 25 Nov 2025 12:15:51 +0100 Buday Csaba wrote:
> When the ID of an Ethernet PHY is not provided by the 'compatible'
> string in the device tree, its actual ID is read via the MDIO bus.
> For some PHYs this could be unsafe, since a hard reset may be
> necessary to safely access the MDIO registers.

You may be missing exports because it doesn't build with allmodconfig:

ERROR: modpost: "mdio_device_register_reset" [drivers/net/mdio/fwnode_mdio.ko] undefined!
ERROR: modpost: "mdio_device_unregister_reset" [drivers/net/mdio/fwnode_mdio.ko] undefined!
-- 
pw-bot: cr