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ath9k: fix a tx processing race condition on AR9300+

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 36267
This commit is contained in:
Felix Fietkau
2013-04-07 22:05:45 +00:00
parent 3a0e6c06e9
commit c42c4837b9
1 changed files with 74 additions and 0 deletions
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74
package/mac80211/patches/300-pending_work.patch
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@@ -1036,3 +1036,77 @@
dev_err(priv->dev, "ath9k_htc: Please upgrade to FW version %d.%d\n",
MAJOR_VERSION_REQ, MINOR_VERSION_REQ);
return -EINVAL;
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -516,8 +516,7 @@ static void ath_tx_complete_aggr(struct
* not a holding desc.
*/
INIT_LIST_HEAD(&bf_head);
- if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) ||
- bf_next != NULL || !bf_last->bf_stale)
+ if (bf_next != NULL || !bf_last->bf_stale)
list_move_tail(&bf->list, &bf_head);
if (!txpending || (tid->state & AGGR_CLEANUP)) {
@@ -537,8 +536,7 @@ static void ath_tx_complete_aggr(struct
!txfail);
} else {
/* retry the un-acked ones */
- if (!(sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) &&
- bf->bf_next == NULL && bf_last->bf_stale) {
+ if (bf->bf_next == NULL && bf_last->bf_stale) {
struct ath_buf *tbf;
tbf = ath_clone_txbuf(sc, bf_last);
@@ -2264,6 +2262,7 @@ void ath_tx_edma_tasklet(struct ath_soft
struct ath_txq *txq;
struct ath_buf *bf, *lastbf;
struct list_head bf_head;
+ struct list_head *fifo_list;
int status;
for (;;) {
@@ -2291,20 +2290,24 @@ void ath_tx_edma_tasklet(struct ath_soft
TX_STAT_INC(txq->axq_qnum, txprocdesc);
- if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
+ fifo_list = &txq->txq_fifo[txq->txq_tailidx];
+ if (list_empty(fifo_list)) {
ath_txq_unlock(sc, txq);
return;
}
- bf = list_first_entry(&txq->txq_fifo[txq->txq_tailidx],
- struct ath_buf, list);
+ bf = list_first_entry(fifo_list, struct ath_buf, list);
+ if (bf->bf_stale) {
+ list_del(&bf->list);
+ ath_tx_return_buffer(sc, bf);
+ bf = list_first_entry(fifo_list, struct ath_buf, list);
+ }
+
lastbf = bf->bf_lastbf;
INIT_LIST_HEAD(&bf_head);
- list_cut_position(&bf_head, &txq->txq_fifo[txq->txq_tailidx],
- &lastbf->list);
-
- if (list_empty(&txq->txq_fifo[txq->txq_tailidx])) {
+ if (list_is_last(&lastbf->list, fifo_list)) {
+ list_splice_tail_init(fifo_list, &bf_head);
INCR(txq->txq_tailidx, ATH_TXFIFO_DEPTH);
if (!list_empty(&txq->axq_q)) {
@@ -2315,6 +2318,11 @@ void ath_tx_edma_tasklet(struct ath_soft
list_splice_tail_init(&txq->axq_q, &bf_q);
ath_tx_txqaddbuf(sc, txq, &bf_q, true);
}
+ } else {
+ lastbf->bf_stale = true;
+ if (bf != lastbf)
+ list_cut_position(&bf_head, fifo_list,
+ lastbf->list.prev);
}
ath_tx_process_buffer(sc, txq, &ts, bf, &bf_head);