Subject: Re: [PATCH net-next 02/11] net: Introduce new api for walking upper and lower devices

From: Stephen Hemminger <[email-masked]>
Date: Mon, 17 Oct 2016 05:21:21 -0700

On Fri, 14 Oct 2016 18:28:42 -0700
David Ahern <[email-masked]> wrote:

>  
>  /**
> + * netdev_has_upper_dev_all - Check if device is linked to an upper device
> + * @dev: device
> + * @upper_dev: upper device to check
> + *
> + * Find out if a device is linked to specified upper device and return true
> + * in case it is. Note that this checks the entire upper device chain.
> + * The caller must hold rcu lock.
> + */
> +
> +static int __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
> +{
> +	struct net_device *dev = (struct net_device *)data;
> +
> +	if (upper_dev == dev)
> +		return 1;
> +
> +	return 0;
> +}
> +
> +bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
> +				  struct net_device *upper_dev)
> +{
> +	if (netdev_walk_all_upper_dev_rcu(dev, __netdev_has_upper_dev,
> +					  upper_dev))
> +		return true;
> +
> +	return false;
> +}
> +EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu);

You should write this more succinctly as:

static bool __netdev_has_upper_dev(struct net_device *upper_dev, void *data)
{
	struct net_device *dev = data;

	return upper_dev == dev;
}

bool netdev_has_upper_dev_all_rcu(struct net_device *dev,
				  struct net_device *upper_dev)
{
	return netdev_walk_all_upper_dev_rcu(dev,
			__netdev_has_upper_dev, upper_dev);
}

No if/else needed. No cast of void * ptr need. Use const if possible?
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