On 2010-09-21 10:19 PM, Ben Greear wrote: > On 09/21/2010 12:32 PM, Felix Fietkau wrote: >> On 2010-09-21 9:28 PM, Johannes Berg wrote: >>> On Tue, 2010-09-21 at 20:00 +0200, Felix Fietkau wrote: >>> >>>>> Could we just poke a pointer to the STA into the ath_buf structure? >>> >>>> No, that doesn't work because of RCU. >>> >>> Well, it could work, if you walk all the structures upon sta_notify and >>> remove now stale pointers (or just drop the frames or something). >> I think it would be much better to just add the helper function that >> checks the RA on STA lookup. Keeps things simple, especially since >> nothing else in the tx path needs the vif. > > How about this. Seems to do the trick on my system: > > > diff --git a/drivers/net/wireless/ath/ath9k/xmit.c > b/drivers/net/wireless/ath/ath9k/xmit.c > index 85a7323..09815a1 100644 > --- a/drivers/net/wireless/ath/ath9k/xmit.c > +++ b/drivers/net/wireless/ath/ath9k/xmit.c > @@ -328,8 +328,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, > struct ath_txq *txq, > > rcu_read_lock(); > > - /* XXX: use ieee80211_find_sta! */ > - sta = ieee80211_find_sta_by_hw(hw, hdr->addr1); > + sta = tx_info->control.sta; As I mentioned in another email: at the time we get the tx status report, we have to consider the sta pointer stale. It may or may not still be valid.
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