Re: [PATCH] net: dsa: lan9303: consequently nested-lock physical MDIO

On Fri, Oct 27, 2023 at 08:57:38AM +0200, A. Sverdlin wrote:

From: Alexander Sverdlin alexander.sverdlin@siemens.com

When LAN9303 is MDIO-connected two callchains exist into mdio->bus->write():

1. switch ports 1&2 ("physical" PHYs):

virtual (switch-internal) MDIO bus (lan9303_switch_ops->phy_{read|write})-> lan9303_mdio_phy_{read|write} -> mdiobus_{read|write}_nested

2. LAN9303 virtual PHY:

virtual MDIO bus (lan9303_phy_{read|write}) -> lan9303_virt_phy_reg_{read|write} -> regmap -> lan9303_mdio_{read|write}

Cc: stable@vger.kernel.org Fixes: dc7005831523 ("net: dsa: LAN9303: add MDIO managed mode support") Signed-off-by: Alexander Sverdlin alexander.sverdlin@siemens.com

Reviewed-by: Andrew Lunn andrew@lunn.ch

Andrew