diff options
| author | Sujith <Sujith.Manoharan@atheros.com> | 2009-01-27 13:30:37 +0530 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-01-30 13:38:24 -0500 |
| commit | 1286ec6d63c557aa203ab5af56962a3d37181771 (patch) | |
| tree | 26b501e0bdf5d64962175cce852330ffd38dde48 | |
| parent | 1f7d6cbfa2a993ea0d714e8552c784eea75a046b (diff) | |
ath9k: Fix station access in aggregation completion
The ieee80211_sta pointer in the SKB's TX control info
area is not guaranteed to be valid after returning from the tx() callback.
Use ieee80211_find_sta() instead and return early if the station
is no longer present.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/net/wireless/ath9k/xmit.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c index 1b83673c3df..007ca91188d 100644 --- a/drivers/net/wireless/ath9k/xmit.c +++ b/drivers/net/wireless/ath9k/xmit.c @@ -268,7 +268,8 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, { struct ath_node *an = NULL; struct sk_buff *skb; - struct ieee80211_tx_info *tx_info; + struct ieee80211_sta *sta; + struct ieee80211_hdr *hdr; struct ath_atx_tid *tid = NULL; struct ath_buf *bf_next, *bf_last = bf->bf_lastbf; struct ath_desc *ds = bf_last->bf_desc; @@ -278,13 +279,19 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, int isaggr, txfail, txpending, sendbar = 0, needreset = 0; skb = (struct sk_buff *)bf->bf_mpdu; - tx_info = IEEE80211_SKB_CB(skb); + hdr = (struct ieee80211_hdr *)skb->data; - if (tx_info->control.sta) { - an = (struct ath_node *)tx_info->control.sta->drv_priv; - tid = ATH_AN_2_TID(an, bf->bf_tidno); + rcu_read_lock(); + + sta = ieee80211_find_sta(sc->hw, hdr->addr1); + if (!sta) { + rcu_read_unlock(); + return; } + an = (struct ath_node *)sta->drv_priv; + tid = ATH_AN_2_TID(an, bf->bf_tidno); + isaggr = bf_isaggr(bf); memset(ba, 0, WME_BA_BMP_SIZE >> 3); @@ -391,6 +398,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, /* send buffered frames as singles */ ath_tx_flush_tid(sc, tid); } + rcu_read_unlock(); return; } @@ -402,6 +410,8 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq, spin_unlock_bh(&txq->axq_lock); } + rcu_read_unlock(); + if (needreset) ath_reset(sc, false); } |