netdev - Re: [PATCH net-next 06/10] net: dsa: qca8k: assign ds->user_mii

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Message-ID: <e9e3e027-5465-4fe2-938e-38062a6a8bc1@broadcom.com>
Date: Thu, 4 Jan 2024 09:35:08 -0800
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Vladimir Oltean <vladimir.oltean@....com>, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...il.com>,
 Luiz Angelo Daros de Luca <luizluca@...il.com>,
 Alvin Šipraga <alsi@...g-olufsen.dk>,
 Linus Walleij <linus.walleij@...aro.org>, Hauke Mehrtens <hauke@...ke-m.de>,
 Christian Marangi <ansuelsmth@...il.com>, Arınç ÜNAL
 <arinc.unal@...nc9.com>
Subject: Re: [PATCH net-next 06/10] net: dsa: qca8k: assign ds->user_mii_bus
 only for the non-OF case

On 1/4/24 06:00, Vladimir Oltean wrote:
> To simplify reasoning about why the DSA framework provides the
> ds->user_mii_bus functionality, drivers should only use it if they
> need to. The qca8k driver appears to also use it simply as storage
> for a pointer, which is not a good enough reason to make the core
> much more difficult to follow.
> 
> ds->user_mii_bus is useful for only 2 cases:
> 
> 1. The driver probes on platform_data (no OF)
> 2. The driver probes on OF, but there is no OF node for the MDIO bus.
> 
> It is unclear if case (1) is supported with qca8k. It might not be:
> the driver might crash when of_device_get_match_data() returns NULL
> and then it dereferences priv->info without NULL checking.
> 
> Anyway, let us limit the ds->user_mii_bus usage only to the above cases,
> and not assign it when an OF node is present.
> 
> The bus->phy_mask assignment follows along with the movement, because
> __of_mdiobus_register() overwrites this bus field anyway. The value set
> by the driver only matters for the non-OF code path.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
-- 
Florian

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