netdev - Re: [PATCH net-next 06/16] net: pcs: xpcs: Avoid creating dummy XPCS MDIO device

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Message-ID: <ZW85iBGAAf5RAsN1@shell.armlinux.org.uk>
Date: Tue, 5 Dec 2023 14:54:00 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Jose Abreu <Jose.Abreu@...opsys.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Tomer Maimon <tmaimon77@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	openbmc@...ts.ozlabs.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 06/16] net: pcs: xpcs: Avoid creating dummy XPCS
 MDIO device

On Tue, Dec 05, 2023 at 01:46:44PM +0000, Russell King (Oracle) wrote:
> For your use case, it would be:
> 
> 	mdiodev = bus->mdio_map[addr];

By the way, this should be:

	mdiodev = mdiobus_find_device(bus, addr);
	if (!mdiodev)
		return ERR_PTR(-ENODEV);

to avoid a layering violation. At some point, we should implement
mdiobus_get_mdiodev() which also deals with the refcount.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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