netdev - Re: [PATCH net-next v2 0/3] Followup fixes for the dwmac and altera lynx conversion

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Date: Tue, 6 Jun 2023 15:32:53 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, alexis.lothore@...tlin.com,
	thomas.petazzoni@...tlin.com, Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net-next v2 0/3] Followup fixes for the dwmac and altera
 lynx conversion

On Tue, Jun 06, 2023 at 04:21:41PM +0200, Maxime Chevallier wrote:
> Following the TSE PCS removal and port of altera_tse and dwmac_socfpga,
> this series fixes some issues that slipped through the cracks.
> 
> Patch 1 fixes an unitialized struct in altera_tse
> 
> Patch 2 uses the correct Kconfig option for altera_tse
> 
> Patch 3 makes the Lynx PCS specific to dwmac_socfpga. This patch was
> originally written by Russell, my modifications just moves the
> #include<linux/pcs-lynx.h> around, to use it only in dwmac_socfpga.

Hi Maxime,

I'm sorry, but I think you need an extra patch added to this series.
Looking at include/linux/mdio/mdio-regmap.h, that defines:

struct mdio_regmap_config {
        struct device *parent;
        struct regmap *regmap;
        char name[MII_BUS_ID_SIZE];
        u8 valid_addr;
        bool autoscan;
};

In dwmac-socfpga.c, you have:

                struct mdio_regmap_config mrc;

                mrc.regmap = pcs_regmap;
                mrc.parent = &pdev->dev;
                mrc.valid_addr = 0x0;

                snprintf(mrc.name, MII_BUS_ID_SIZE, "%s-pcs-mii", ndev->name);

So that's a tick for parent, tick for regmap, tick for name, tick
for valid_addr, but... autoscan is left uninitialised.
devm_mdio_regmap_register() reads this, and uses it to decide
how to set mii->phy_mask, which will be randomly ~0 or ~BIT(0)
depending on the value of mrc.autoscan.

Other than that, the series looks good. Thanks.

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