linux-kernel - Re: [net-next PATCH 08/14] net: phy: at803x: drop specific PHY id check from cable test functions

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Date:   Wed, 29 Nov 2023 09:38:39 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Christian Marangi <ansuelsmth@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [net-next PATCH 08/14] net: phy: at803x: drop specific PHY id
 check from cable test functions

On Wed, Nov 29, 2023 at 03:12:13AM +0100, Christian Marangi wrote:
> @@ -1310,10 +1302,6 @@ static int at803x_cable_test_start(struct phy_device *phydev)
>  	 */
>  	phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
>  	phy_write(phydev, MII_ADVERTISE, ADVERTISE_CSMA);
> -	if (phydev->phy_id != ATH9331_PHY_ID &&
> -	    phydev->phy_id != ATH8032_PHY_ID &&
> -	    phydev->phy_id != QCA9561_PHY_ID)
> -		phy_write(phydev, MII_CTRL1000, 0);
...
> +static int at8031_cable_test_start(struct phy_device *phydev)
> +{
> +	at803x_cable_test_start(phydev);
> +	phy_write(phydev, MII_CTRL1000, 0);

I don't think this is a safe change - same reasons as given on a
previous patch. You can't randomly reorder register writes like this.

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