netdev - Re: [RFC][PATCH] ethtool: Add reset operation

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Message-ID: <20091002104010.GA19862@serverengines.com>
Date:	Fri, 2 Oct 2009 16:10:12 +0530
From:	Ajit Khaparde <ajitk@...verengines.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com
Subject: Re: [RFC][PATCH] ethtool: Add reset operation

On 01/10/09 20:43 +0100, Ben Hutchings wrote:
> After updating firmware stored in flash, users may wish to reset the
> relevant hardware and start the new firmware immediately.  This should
> not be completely automatic as it may be disruptive.
> 
> A selective reset may also be useful for debugging or diagnostics.
> 
> This adds a separate reset operation which takes flags indicating the
> components to be reset.  Drivers are allowed to reset only a subset of
> those requested, and must report the actual subset.  This allows the
> use of generic component masks and some future expansion.
> ---
Looks good. But one question.

> +static int ethtool_reset(struct net_device *dev, char __user *useraddr)
> +{
> +	struct ethtool_value reset;
> +	int ret;
> +
> +	if (!dev->ethtool_ops->reset)
> +		return -EOPNOTSUPP;
> +
> +	if (copy_from_user(&reset, useraddr, sizeof(reset)))
> +		return -EFAULT;
> +
> +	ret = dev->ethtool_ops->reset(dev, &reset.data);
> +	if (ret)
> +		return ret;
> +
> +	if (copy_to_user(useraddr, &reset, sizeof(reset)))
> +		return -EFAULT;
Can you tell the intention behind this copy_to_user?
Do you envision drivers sending back some data to the userland - may be
sometime in future?

Thanks
-Ajit
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