netdev - Re: [PATCH v3 3/5] net: use ndo_fix_features for ethtool_ops->set

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Date:	Thu, 3 Feb 2011 14:45:09 +0100
From:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/5] net: use ndo_fix_features for
	ethtool_ops->set_flags

On Sun, Jan 30, 2011 at 08:44:03AM +1000, Ben Hutchings wrote:
> On Sat, 2011-01-29 at 19:39 +0100, Michał Mirosław wrote:
> > Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> > ---
> >  net/core/ethtool.c |   22 ++++++++++++++++++++--
> >  1 files changed, 20 insertions(+), 2 deletions(-)
> > 
> > diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> > index 409aebb..17a689f4 100644
> > --- a/net/core/ethtool.c
> > +++ b/net/core/ethtool.c
> > @@ -240,6 +240,25 @@ static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
> >  	return ret;
> >  }
> >  
> > +static int __ethtool_set_flags(struct net_device *dev, u32 data)
> > +{
> > +	if (data & ~flags_dup_features)
> > +		return -EINVAL;
> > +
> > +	if (!(dev->hw_features & flags_dup_features)) {
> > +		if (!dev->ethtool_ops->set_flags)
> > +			return -EOPNOTSUPP;
> > +		return dev->ethtool_ops->set_flags(dev, data);
> > +	}
> > +
> > +	dev->wanted_features =
> > +		(dev->wanted_features & ~flags_dup_features) | data;
> > +
> > +	netdev_update_features(dev);
> > +
> > +	return 0;
> [...]
> 
> I think it would be clearer to write this as:
[cut]

I changed it to check for more invalid states and to reject changing
of bits not in hw_features but present in flags_dup_features.

Best Regards,
Michał Mirosław
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