[PATCH v6] mac80211: Remove control.sta from struct ieee80211_tx_info and restructure tx-path

[Thomas Huehn <thomas@net.t-labs.tu-berlin.de>]

Hi Johannes,

Johannes Berg schrieb:

>>
>> /home/johannes/sys/wireless/drivers/net/wireless/ti/wlcore/tx.c: In
>> function ?wl1271_skb_queue_head?:
>> /home/johannes/sys/wireless/drivers/net/wireless/ti/wlcore/tx.c:622:48:
>> warning: ?hlid? may be used uninitialized in this function
>> [-Wuninitialized]
> 
> Those changes make no sense anyway -- you should be able to pass the
> station pointer through if it previously used info->control.sta, instead
> of doing an (expensive) lookup.


This is the call path

in main.c ... INIT_WORK(&wl->tx_work, wl1271_tx_work);
 jumps to tx.c...wl1271_tx_work(struct work_struct *work)
  calls wl1271_tx_work(struct work_struct *work)
   calls wlcore_tx_work_locked(struct wl1271 *wl)
    calls wl1271_skb_queue_head()
     calls wl12xx_tx_get_hlid()
      calls wl12xx_tx_get_hlid_ap() .... where sta is needed.

But I could not find any point in the call path where I could grab the
sta pointer and pass it through. I will move the rcu into
wl12xx_tx_get_hlid_ap(), but I do not see any cheaper way here as using rcu.

Greetings Thomas