netdev - Re: [PATCH net] net: phy: add device link between MAC device and MDIO device

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Message-ID: <20260128201501.04bb6e5c@kernel.org>
Date: Wed, 28 Jan 2026 20:15:01 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
 florian.fainelli@...adcom.com, xiaolei.wang@...driver.com
Cc: Wei Fang <wei.fang@....com>, davem@...emloft.net, edumazet@...gle.com,
 pabeni@...hat.com, maxime.chevallier@...tlin.com,
 quic_abchauha@...cinc.com, quic_sarohasa@...cinc.com, imx@...ts.linux.dev,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net: phy: add device link between MAC device and
 MDIO device

On Mon, 26 Jan 2026 18:44:09 +0800 Wei Fang wrote:
> The commit bc66fa87d4fd ("net: phy: Add link between phy dev and mac
> dev") has created a device link between the MAC and the PHY if the MAC
> uses a shared MDIO bus (The MDIO and the MAC are two separate devices).
> Sarosh Hasan tried to change the DL_FLAG_STATELESS flag to
> DL_FLAG_AUTOREMOVE_SUPPLIER to fix the issue [1]. However, the solution
> does not take into account the hot-swappable PHY devices (such as SFP).
> so when the PHY device is unplugged, the MAC driver will automatically
> be removed, which is not the expected behavior.
> 
> Therefore, to solve this issue of the shared MDIO bus, we create the
> device link between the MAC device and the MDIO device, rather than
> between the MAC device and the PHY device. And when the shared MDIO bus
> is removed, all MAC drivers that depend on it will also be removed.

Anyone willing to venture a review tag?