netdev - Re: [PATCH net] gianfar: Check if phydev present on ethtool -A

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Date:	Wed, 23 Apr 2014 17:21:27 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Claudiu Manoil <claudiu.manoil@...escale.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] gianfar: Check if phydev present on ethtool -A

On Wed, 2014-04-23 at 16:38 +0300, Claudiu Manoil wrote:
> This fixes a seg fault on 'ethtool -A' entry if the
> interface is down.  Obviously we need to have the
> phy device initialized / "connected" (see of_phy_connect())
> to be able to advertise pause frame capabilities.

Why is the phydev detached while the interface is down?!

> Fixes: 23402bddf9e56eecb27bbd1e5467b3b79b3dbe58
> Signed-off-by: Claudiu Manoil <claudiu.manoil@...escale.com>
> ---
>  drivers/net/ethernet/freescale/gianfar_ethtool.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> index 891dbee..76d7070 100644
> --- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
> +++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> @@ -533,6 +533,9 @@ static int gfar_spauseparam(struct net_device *dev,
>  	struct gfar __iomem *regs = priv->gfargrp[0].regs;
>  	u32 oldadv, newadv;
>  
> +	if (!phydev)
> +		return -ENODEV;
> +
>  	if (!(phydev->supported & SUPPORTED_Pause) ||
>  	    (!(phydev->supported & SUPPORTED_Asym_Pause) &&
>  	     (epause->rx_pause != epause->tx_pause)))

I think you can instead remove the following check, as pause support is
a property of the MAC not the PHY.

Ben.

-- 
Ben Hutchings
Beware of programmers who carry screwdrivers. - Leonard Brandwein

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