netdev - Re: [PATCH net 2/2] sh_eth: Fix ethtool operation crash when net device is down

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Date:	Mon, 19 Jan 2015 10:41:25 +0000
From:	Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	ct178-internal@...ts.codethink.co.uk,
	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...ts.codethink.co.uk>,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>,
	Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>,
	Hisashi Nakamura <hisashi.nakamura.ak@...esas.com>,
	Yoshihiro Kaneko <ykaneko0929@...il.com>
Subject: Re: [PATCH net 2/2] sh_eth: Fix ethtool operation crash when net
 device is down

On Fri, 2015-01-16 at 10:45 -0800, Florian Fainelli wrote:
> 2015-01-16 9:51 GMT-08:00 Ben Hutchings <ben.hutchings@...ethink.co.uk>:
[...]
> > --- a/drivers/net/ethernet/renesas/sh_eth.c
> > +++ b/drivers/net/ethernet/renesas/sh_eth.c
> > @@ -1827,6 +1827,9 @@ static int sh_eth_get_settings(struct net_device *ndev,
> >         unsigned long flags;
> >         int ret;
> >
> > +       if (!mdp->phydev)
> > +               return -ENODEV;
> 
> Since the PHY is disconnected, would not checking for netif_running()
> make sense here, unless there is a good reason to still allow
> phy_ethtool_gset() to be called?
[...]

I think those two conditions will be equivalent, won't they?  Writing
the condition like this will also work if the driver later supports
PHY-less configurations.

Ben.


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