netdev - Re: [PATCH v2 1/3] net: phy: at803x: use PHY_ID_MATCH

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Date:   Tue, 1 Oct 2019 20:37:50 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] net: phy: at803x: use PHY_ID_MATCH_EXACT for IDs

On 01.10.2019 08:08, Oleksij Rempel wrote:
> Use exact match for all IDs. We have no sanity checks, so we can peek
> a device with no exact ID and different register layout.
> 

I think it would be better to use PHY_ID_MATCH_EXACT for the newly
added AR9331 only. The mask 0xffffffef for the other Atheros PHY's
may be there for a reason. In this case other PHY's matching the
mask would be silently switched to the genphy driver and may
misbehave.

> Suggested-by: Heiner Kallweit <hkallweit1@...il.com>
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/phy/at803x.c | 13 ++++---------
>  1 file changed, 4 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> index 6ad8b1c63c34..7895dbe600ac 100644
> --- a/drivers/net/phy/at803x.c
> +++ b/drivers/net/phy/at803x.c
> @@ -364,9 +364,8 @@ static int at803x_aneg_done(struct phy_device *phydev)
>  static struct phy_driver at803x_driver[] = {
>  {
>  	/* ATHEROS 8035 */
> -	.phy_id			= ATH8035_PHY_ID,
> +	PHY_ID_MATCH_EXACT(ATH8035_PHY_ID),
>  	.name			= "Atheros 8035 ethernet",
> -	.phy_id_mask		= AT803X_PHY_ID_MASK,
>  	.probe			= at803x_probe,
>  	.config_init		= at803x_config_init,
>  	.set_wol		= at803x_set_wol,
> @@ -378,9 +377,8 @@ static struct phy_driver at803x_driver[] = {
>  	.config_intr		= at803x_config_intr,
>  }, {
>  	/* ATHEROS 8030 */
> -	.phy_id			= ATH8030_PHY_ID,
> +	PHY_ID_MATCH_EXACT(ATH8030_PHY_ID),
>  	.name			= "Atheros 8030 ethernet",
> -	.phy_id_mask		= AT803X_PHY_ID_MASK,
>  	.probe			= at803x_probe,
>  	.config_init		= at803x_config_init,
>  	.link_change_notify	= at803x_link_change_notify,
> @@ -393,9 +391,8 @@ static struct phy_driver at803x_driver[] = {
>  	.config_intr		= at803x_config_intr,
>  }, {
>  	/* ATHEROS 8031 */
> -	.phy_id			= ATH8031_PHY_ID,
> +	PHY_ID_MATCH_EXACT(ATH8031_PHY_ID),
>  	.name			= "Atheros 8031 ethernet",
> -	.phy_id_mask		= AT803X_PHY_ID_MASK,
>  	.probe			= at803x_probe,
>  	.config_init		= at803x_config_init,
>  	.set_wol		= at803x_set_wol,
> @@ -411,9 +408,7 @@ static struct phy_driver at803x_driver[] = {
>  module_phy_driver(at803x_driver);
>  
>  static struct mdio_device_id __maybe_unused atheros_tbl[] = {
> -	{ ATH8030_PHY_ID, AT803X_PHY_ID_MASK },
> -	{ ATH8031_PHY_ID, AT803X_PHY_ID_MASK },
> -	{ ATH8035_PHY_ID, AT803X_PHY_ID_MASK },
> +	{ PHY_ID_MATCH_VENDOR(ATH8030_PHY_ID) },
>  	{ }
>  };
>  
>