netdev - Re: [PATCH net] net: phy: smsc: bail out in lan87xx_read_status if genphy_read

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Date:   Mon, 13 Mar 2023 14:36:06 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Patrick Trantham <patrick.trantham@...l7.com>
Subject: Re: [PATCH net] net: phy: smsc: bail out in lan87xx_read_status if
 genphy_read_status fails

On Sat, Mar 11, 2023 at 07:34:45PM +0100, Heiner Kallweit wrote:
> If genphy_read_status fails then further access to the PHY may result
> in unpredictable behavior. To prevent this bail out immediately if
> genphy_read_status fails.
> 
> Fixes: 4223dbffed9f ("net: phy: smsc: Re-enable EDPD mode for LAN87xx")
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

> ---
>  drivers/net/phy/smsc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
> index 9cfaccce1..721871184 100644
> --- a/drivers/net/phy/smsc.c
> +++ b/drivers/net/phy/smsc.c
> @@ -189,8 +189,11 @@ static int lan95xx_config_aneg_ext(struct phy_device *phydev)
>  static int lan87xx_read_status(struct phy_device *phydev)
>  {
>  	struct smsc_phy_priv *priv = phydev->priv;
> +	int err;
>  
> -	int err = genphy_read_status(phydev);
> +	err = genphy_read_status(phydev);
> +	if (err)
> +		return err;
>  
>  	if (!phydev->link && priv->energy_enable && phydev->irq == PHY_POLL) {
>  		/* Disable EDPD to wake up PHY */
> -- 
> 2.39.2