linux-kernel - Re: [PATCH] enetc: add ioctl() support for PHY-related ops

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Date:   Thu, 7 Nov 2019 16:25:32 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Claudiu Manoil <claudiu.manoil@....com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH] enetc: add ioctl() support for PHY-related ops

On Thu, Nov 07, 2019 at 09:39:37AM +0100, Michael Walle wrote:
> If there is an attached PHY try to handle the requested ioctl with its
> handler, which allows the userspace to access PHY registers, for
> example. This will make mii-diag and similar tools work.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/net/ethernet/freescale/enetc/enetc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/freescale/enetc/enetc.c b/drivers/net/ethernet/freescale/enetc/enetc.c
> index b6ff89307409..25af207f1962 100644
> --- a/drivers/net/ethernet/freescale/enetc/enetc.c
> +++ b/drivers/net/ethernet/freescale/enetc/enetc.c
> @@ -1599,7 +1599,10 @@ int enetc_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
>  	if (cmd == SIOCGHWTSTAMP)
>  		return enetc_hwtstamp_get(ndev, rq);
>  #endif
> -	return -EINVAL;
> +
> +	if (!ndev->phydev)
> +		return -EINVAL;

Hi Michael

I think EOPNOTSUPP is normal. Yes, you are just moving around what was
there before, but you could make this improvement as well.

If you don't want to:

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew