netdev - Re: [patch net-next 01/15] net: introduce upper device lists

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Date:	Sat, 29 Dec 2012 15:31:01 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jiri@...nulli.us
Cc:	netdev@...r.kernel.org, edumazet@...gle.com,
	bhutchings@...arflare.com, faisal.latif@...el.com,
	shemminger@...tta.com, fbl@...hat.com, roland@...nel.org,
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	pablo@...filter.org
Subject: Re: [patch net-next 01/15] net: introduce upper device lists

From: Jiri Pirko <jiri@...nulli.us>
Date: Sat, 29 Dec 2012 11:38:28 +0100

> +	/*
> +	 * To prevent loops, check if dev is not upper device to upper_dev.
> +	 */

Please use:

	/* To prevent loops, check if dev is not upper device to upper_dev.  */

> +/**
> + * netdev_upper_free_rcu - Frees a upper device list item via the RCU pointer
> + * @entry: the entry's RCU field
> + *
> + * This function is designed to be used as a callback to the call_rcu()
> + * function so that the memory allocated to the netdev upper device list item
> + * can be released safely.
> + */
> +static void netdev_upper_free_rcu(struct rcu_head *entry)
> +{
> +	struct netdev_upper *upper;
> +
> +	upper = container_of(entry, struct netdev_upper, rcu);
> +	kfree(upper);
> +}

Please use kfree_rcu().

Also, since __netdev_has_upper_dev() modifies &search_list inside
of the list traversal loop, I think you really need to use
list_for_each_entry_safe() even though you always append to the
tail of &search_list.
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