netdev - Re: [PATCH net] net: phy: fix phy_uses_state

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Message-ID: <20250901084225.pmkcmn3xa7fngxvp@skbuf>
Date: Mon, 1 Sep 2025 11:42:25 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net] net: phy: fix phy_uses_state_machine()

On Sun, Aug 31, 2025 at 05:38:11PM +0100, Russell King (Oracle) wrote:
> phydev->phy_link_change is initialised by phy_attach_direct(), and
> overridden by phylink. This means that a never-connected PHY will
> have phydev->phy_link_change set to NULL, which causes
> phy_uses_state_machine() to return true. This is incorrect.

Another nitpick regarding phrasing here: the never-connected PHY doesn't
_cause_ phy_uses_state_machine() to return true. It returns true _in
spite_ of the PHY never being connected: the non-NULL quality of
phydev->phy_link_change is not something that phy_uses_state_machine()
tests for.