linux-kernel - Re: [PATCH net] net: stmmac: platform: guarantee uniqueness of bus

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Message-ID: <b3e3293a-3220-4540-9c8b-9aa9a2ef6427@redhat.com>
Date: Mon, 26 May 2025 22:26:47 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Quentin Schulz <foss+kernel@...il.net>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Maxime Coquelin
 <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc: Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>,
 Heiko Stuebner <heiko@...ech.de>, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Quentin Schulz <quentin.schulz@...rry.de>
Subject: Re: [PATCH net] net: stmmac: platform: guarantee uniqueness of bus_id

On 5/21/25 5:21 PM, Quentin Schulz wrote:
> From: Quentin Schulz <quentin.schulz@...rry.de>
> 
> bus_id is currently derived from the ethernetX alias. If one is missing
> for the device, 0 is used. If ethernet0 points to another stmmac device
> or if there are 2+ stmmac devices without an ethernet alias, then bus_id
> will be 0 for all of those.
> 
> This is an issue because the bus_id is used to generate the mdio bus id
> (new_bus->id in drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> stmmac_mdio_register) and this needs to be unique.
> 
> This allows to avoid needing to define ethernet aliases for devices with
> multiple stmmac controllers (such as the Rockchip RK3588) for multiple
> stmmac devices to probe properly.
> 
> Obviously, the bus_id isn't guaranteed to be stable across reboots if no
> alias is set for the device but that is easily fixed by simply adding an
> alias if this is desired.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...rry.de>

I think no need to CC stable here, but you need to provide a suitable
fixes tag, thanks!

Paolo