netdev - Re: [PATCH net-next] net: phy: lan87xx: fix access to wrong register of LAN87xx

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Date:   Tue, 30 Mar 2021 13:01:33 +0100
From:   Måns Rullgård <mans@...sr.com>
To:     Andre Edich <andre.edich@...rochip.com>
Cc:     <netdev@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>,
        <Parthiban.Veerasooran@...rochip.com>
Subject: Re: [PATCH net-next] net: phy: lan87xx: fix access to wrong
 register of LAN87xx

Andre Edich <andre.edich@...rochip.com> writes:

> The function lan87xx_config_aneg_ext was introduced to configure
> LAN95xxA but as well writes to undocumented register of LAN87xx.
> This fix prevents that access.
>
> The function lan87xx_config_aneg_ext gets more suitable for the new
> behavior name.
>
> Reported-by: Måns Rullgård <mans@...sr.com>
> Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support")
> Signed-off-by: Andre Edich <andre.edich@...rochip.com>
> ---
>  drivers/net/phy/smsc.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

I can confirm that this fixes the problem I was seeing.

> diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
> index ddb78fb4d6dc..d8cac02a79b9 100644
> --- a/drivers/net/phy/smsc.c
> +++ b/drivers/net/phy/smsc.c
> @@ -185,10 +185,13 @@ static int lan87xx_config_aneg(struct phy_device *phydev)
>  	return genphy_config_aneg(phydev);
>  }
>
> -static int lan87xx_config_aneg_ext(struct phy_device *phydev)
> +static int lan95xx_config_aneg_ext(struct phy_device *phydev)
>  {
>  	int rc;
>
> +	if (phydev->phy_id != 0x0007c0f0) /* not (LAN9500A or LAN9505A) */
> +		return lan87xx_config_aneg(phydev);
> +
>  	/* Extend Manual AutoMDIX timer */
>  	rc = phy_read(phydev, PHY_EDPD_CONFIG);
>  	if (rc < 0)
> @@ -441,7 +444,7 @@ static struct phy_driver smsc_phy_driver[] = {
>  	.read_status	= lan87xx_read_status,
>  	.config_init	= smsc_phy_config_init,
>  	.soft_reset	= smsc_phy_reset,
> -	.config_aneg	= lan87xx_config_aneg_ext,
> +	.config_aneg	= lan95xx_config_aneg_ext,
>
>  	/* IRQ related */
>  	.config_intr	= smsc_phy_config_intr,
> -- 
>
> 2.28.0
>

-- 
Måns Rullgård