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Subject: Re: [PATCH RESEND net] net: phy: xgmiitorgmii: Support generic PHY
 status read
To:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
        netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
Cc:     Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        "David S . Miller" <davem@davemloft.net>,
        Michal Simek <michal.simek@xilinx.com>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>
References: <20190215163220.20041-1-paul.kocialkowski@bootlin.com>
From:   Florian Fainelli <f.fainelli@gmail.com>
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Message-ID: <387ed483-b205-beda-319d-6f2b8ea55601@gmail.com>
Date:   Fri, 15 Feb 2019 09:38:27 -0800
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On 2/15/19 8:32 AM, Paul Kocialkowski wrote:
> Some PHY drivers like the generic one do not provide a read_status
> callback on their own but rely on genphy_read_status being called
> directly.
> 
> With the current code, this results in a NULL function pointer call.
> Call genphy_read_status instead when there is no specific callback.
> 
> Fixes: f411a6160bd4 ("net: phy: Add gmiitorgmii converter support")
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
> Added Fixes tag and net label for resend.

You would want to use phy_read_status() which encapsulates that check as
well as checks that the phy_drv pointer is not NULL.

> 
>  drivers/net/phy/xilinx_gmii2rgmii.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
> index 74a8782313cf..bd6084e315de 100644
> --- a/drivers/net/phy/xilinx_gmii2rgmii.c
> +++ b/drivers/net/phy/xilinx_gmii2rgmii.c
> @@ -44,7 +44,10 @@ static int xgmiitorgmii_read_status(struct phy_device *phydev)
>  	u16 val = 0;
>  	int err;
>  
> -	err = priv->phy_drv->read_status(phydev);
> +	if (priv->phy_drv->read_status)
> +		err = priv->phy_drv->read_status(phydev);
> +	else
> +		err = genphy_read_status(phydev);
>  	if (err < 0)
>  		return err;
>  
> 


-- 
Florian