Re: [PATCH 1/3] mac80211: implement ieee80211_get_vif_by_addr

[Johannes Berg <johannes@sipsolutions.net>]

On Sun, 2013-11-24 at 17:56 +0100, Lorenzo Bianconi wrote:
> ieee80211_get_vif_by_addr allows low level drivers to get a reference to
> vif data structure which is not added to the driver as monitor interface.
> ieee80211_get_vif_by_addr will be used in ath9k tx99 code

Is that really better than having the driver use the iteration
functions?

> + */
> +struct ieee80211_vif *ieee80211_get_vif_by_addr(struct ieee80211_hw *hw,
> +						const u8 *mac)
> +{
> +	struct ieee80211_vif *vif = NULL;
> +	struct ieee80211_local *local = hw_to_local(hw);
> +	struct ieee80211_sub_if_data *sdata;
> +
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
> +		if (!compare_ether_addr(sdata->vif.addr, mac)) {
> +			vif = &sdata->vif;
> +			break;
> +		}
> +	}
> +	rcu_read_unlock();
> +
> +	return vif;

In any case, this is completely broken wrt. locking, so I'm not taking
it.

johannes