ethtool_set_features suggestion

[Ben Greear <greearb@candelatech.com>]

static int ethtool_set_features(struct net_device *dev, void __user *useraddr)
{
	struct ethtool_sfeatures cmd;
	struct ethtool_set_features_block features[ETHTOOL_DEV_FEATURE_WORDS];
	netdev_features_t wanted = 0, valid = 0;
	int i, ret = 0;

	if (copy_from_user(&cmd, useraddr, sizeof(cmd)))
		return -EFAULT;
	useraddr += sizeof(cmd);

	if (cmd.size != ETHTOOL_DEV_FEATURE_WORDS)
		return -EINVAL;

(This is from net-next, with Miroslaw's patches applied)

I was thinking that we should deal with whatever size is passed in.
That way, if we ever expand the kernel
feature-words size, an old user-space ethtool app would
still function OK.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com