linux-kernel - Re: [PATCH net 1/1] net: stmmac: add check for supported link mode before mode change

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Message-ID: <Y2vcUWFTdWG0D2GI@lunn.ch>
Date:   Wed, 9 Nov 2022 17:58:57 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Noor Azura Ahmad Tarmizi 
        <noor.azura.ahmad.tarmizi@...ux.intel.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Voon Weifeng <weifeng.voon@...el.com>,
        Tan Tee Min <tee.min.tan@...el.com>,
        Looi Hong Aun <hong.aun.looi@...el.com>,
        Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>
Subject: Re: [PATCH net 1/1] net: stmmac: add check for supported link mode
 before mode change

On Wed, Nov 09, 2022 at 10:43:29AM +0800, Noor Azura Ahmad Tarmizi wrote:
> From: Noor Azura Ahmad Tarmizi <noor.azura.ahmad.tarmizi@...el.com>
> 
> Currently, change for unsupported speed and duplex are sent to the phy,
> rendering the link to unknown speed (link state down).

Something does not seem correct. See:

https://elixir.bootlin.com/linux/v6.1-rc4/source/drivers/net/phy/phy.c#L816

	/* We make sure that we don't pass unsupported values in to the PHY */
	linkmode_and(advertising, advertising, phydev->supported);

Do you somehow have phydev->supported set wrong?

   Andrew