The commit "ath9k: simplify tx locking" introduced a soft lockup triggered
by mac80211 sending a BAR frame triggered by a driver call to
ieee80211_tx_send_bar or ieee80211_tx_status.
Fix these issues by queueing processed tx status skbs and submitting them
to mac80211 outside of the lock.
Signed-off-by: Felix Fietkau<nbd@xxxxxxxxxxx>
Signed-off-by: Mohammed Shafi Shajakhan<mohammed@xxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/ath9k.h | 1 +
drivers/net/wireless/ath/ath9k/xmit.c | 96 +++++++++++++++++++++-----------
2 files changed, 65 insertions(+), 32 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 130e5db..95276e9 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -196,6 +196,7 @@ struct ath_txq {
u8 txq_headidx;
u8 txq_tailidx;
int pending_frames;
+ struct sk_buff_head complete_q;
};
struct ath_atx_ac {
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 23e80e6..60d372b 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -104,6 +104,29 @@ static int ath_max_4ms_framelen[4][32] = {
/* Aggregation logic */
/*********************/
+static void ath_txq_lock(struct ath_softc *sc, struct ath_txq *txq)
+{
+ spin_lock_bh(&txq->axq_lock);
+}
+
+static void ath_txq_unlock(struct ath_softc *sc, struct ath_txq *txq)
+{
+ spin_unlock_bh(&txq->axq_lock);
+}
+
+static void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq)
+{
+ struct sk_buff_head q;
+ struct sk_buff *skb;
+
+ __skb_queue_head_init(&q);
+ skb_queue_splice_init(&txq->complete_q,&q);
+ spin_unlock_bh(&txq->axq_lock);
+
+ while ((skb = __skb_dequeue(&q)))
+ ieee80211_tx_status(sc->hw, skb);
+}
+
static void ath_tx_queue_tid(struct ath_txq *txq, struct ath_atx_tid *tid)
{
struct ath_atx_ac *ac = tid->ac;
@@ -130,7 +153,7 @@ static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
WARN_ON(!tid->paused);
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
tid->paused = false;
if (skb_queue_empty(&tid->buf_q))
@@ -139,7 +162,7 @@ static void ath_tx_resume_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
ath_tx_queue_tid(txq, tid);
ath_txq_schedule(sc, txq);
unlock:
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
static struct ath_frame_info *get_frame_info(struct sk_buff *skb)
@@ -189,8 +212,11 @@ static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
tid->state&= ~AGGR_CLEANUP;
}
- if (sendbar)
+ if (sendbar) {
+ ath_txq_unlock(sc, txq);
ath_send_bar(tid, tid->seq_start);
+ ath_txq_lock(sc, txq);
+ }
}
static void ath_tx_update_baw(struct ath_softc *sc, struct ath_atx_tid *tid,
@@ -554,13 +580,6 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
bf = bf_next;
}
- if (bar_index>= 0) {
- u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
- ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
- if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
- tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
- }
-
/* prepend un-acked frames to the beginning of the pending frame queue */
if (!skb_queue_empty(&bf_pending)) {
if (an->sleeping)
@@ -575,6 +594,17 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
}
}
+ if (bar_index>= 0) {
+ u16 bar_seq = ATH_BA_INDEX2SEQ(seq_first, bar_index);
+
+ if (BAW_WITHIN(tid->seq_start, tid->baw_size, bar_seq))
+ tid->bar_index = ATH_BA_INDEX(tid->seq_start, bar_seq);
+
+ ath_txq_unlock(sc, txq);
+ ath_send_bar(tid, ATH_BA_INDEX2SEQ(seq_first, bar_index + 1));
+ ath_txq_lock(sc, txq);
+ }
+
if (tid->state& AGGR_CLEANUP)
ath_tx_flush_tid(sc, tid);
@@ -1172,7 +1202,7 @@ void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
return;
}
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
txtid->paused = true;
/*
@@ -1187,7 +1217,7 @@ void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
txtid->state&= ~AGGR_ADDBA_COMPLETE;
ath_tx_flush_tid(sc, txtid);
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
@@ -1208,7 +1238,7 @@ void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
ac = tid->ac;
txq = ac->txq;
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
buffered = !skb_queue_empty(&tid->buf_q);
@@ -1220,7 +1250,7 @@ void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
list_del(&ac->list);
}
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock(sc, txq);
ieee80211_sta_set_buffered(sta, tidno, buffered);
}
@@ -1239,7 +1269,7 @@ void ath_tx_aggr_wakeup(struct ath_softc *sc, struct ath_node *an)
ac = tid->ac;
txq = ac->txq;
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
ac->clear_ps_filter = true;
if (!skb_queue_empty(&tid->buf_q)&& !tid->paused) {
@@ -1247,7 +1277,7 @@ void ath_tx_aggr_wakeup(struct ath_softc *sc, struct ath_node *an)
ath_txq_schedule(sc, txq);
}
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
}
@@ -1347,6 +1377,7 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
txq->axq_qnum = axq_qnum;
txq->mac80211_qnum = -1;
txq->axq_link = NULL;
+ __skb_queue_head_init(&txq->complete_q);
INIT_LIST_HEAD(&txq->axq_q);
INIT_LIST_HEAD(&txq->axq_acq);
spin_lock_init(&txq->axq_lock);
@@ -1471,7 +1502,8 @@ static void ath_drain_txq_list(struct ath_softc *sc, struct ath_txq *txq,
*/
void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
{
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
+
if (sc->sc_ah->caps.hw_caps& ATH9K_HW_CAP_EDMA) {
int idx = txq->txq_tailidx;
@@ -1492,7 +1524,7 @@ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
if ((sc->sc_flags& SC_OP_TXAGGR)&& !retry_tx)
ath_txq_drain_pending_buffers(sc, txq);
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
bool ath_drain_all_txq(struct ath_softc *sc, bool retry_tx)
@@ -1925,7 +1957,8 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
*/
q = skb_get_queue_mapping(skb);
- spin_lock_bh(&txq->axq_lock);
+
+ ath_txq_lock(sc, txq);
if (txq == sc->tx.txq_map[q]&&
++txq->pending_frames> ATH_MAX_QDEPTH&& !txq->stopped) {
ieee80211_stop_queue(sc->hw, q);
@@ -1934,7 +1967,7 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
ath_tx_start_dma(sc, skb, txctl);
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock(sc, txq);
return 0;
}
@@ -1946,7 +1979,6 @@ int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
int tx_flags, struct ath_txq *txq)
{
- struct ieee80211_hw *hw = sc->hw;
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data;
@@ -1990,7 +2022,7 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
}
}
- ieee80211_tx_status(hw, skb);
+ __skb_queue_tail(&txq->complete_q, skb);
}
static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
@@ -2126,7 +2158,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
txq->axq_qnum, ath9k_hw_gettxbuf(sc->sc_ah, txq->axq_qnum),
txq->axq_link);
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
for (;;) {
if (work_pending(&sc->hw_reset_work))
break;
@@ -2185,7 +2217,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
ath_tx_process_buffer(sc, txq,&ts, bf,&bf_head);
}
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
static void ath_tx_complete_poll_work(struct work_struct *work)
@@ -2202,17 +2234,17 @@ static void ath_tx_complete_poll_work(struct work_struct *work)
for (i = 0; i< ATH9K_NUM_TX_QUEUES; i++)
if (ATH_TXQ_SETUP(sc, i)) {
txq =&sc->tx.txq[i];
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
if (txq->axq_depth) {
if (txq->axq_tx_inprogress) {
needreset = true;
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock(sc, txq);
break;
} else {
txq->axq_tx_inprogress = true;
}
}
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
if (needreset) {
@@ -2270,10 +2302,10 @@ void ath_tx_edma_tasklet(struct ath_softc *sc)
txq =&sc->tx.txq[ts.qid];
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock(sc, txq);
return;
}
@@ -2299,7 +2331,7 @@ void ath_tx_edma_tasklet(struct ath_softc *sc)
}
ath_tx_process_buffer(sc, txq,&ts, bf,&bf_head);
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock_complete(sc, txq);
}
}
@@ -2437,7 +2469,7 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
ac = tid->ac;
txq = ac->txq;
- spin_lock_bh(&txq->axq_lock);
+ ath_txq_lock(sc, txq);
if (tid->sched) {
list_del(&tid->list);
@@ -2453,6 +2485,6 @@ void ath_tx_node_cleanup(struct ath_softc *sc, struct ath_node *an)
tid->state&= ~AGGR_ADDBA_COMPLETE;
tid->state&= ~AGGR_CLEANUP;
- spin_unlock_bh(&txq->axq_lock);
+ ath_txq_unlock(sc, txq);
}
}
