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ath9k: Handle holding descriptor in TX completion properly 

If the current holding descriptor is the last one in the TX queue,
*and* it has been marked as STALE, then move it to the free list
and bail out, as it has already been processed.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith 2009-01-16 21:38:51 +05:30 committed by John W. Linville
parent 059d806cdc
commit 6ef9b13db2
1 changed files with 11 additions and 8 deletions
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17
drivers/net/wireless/ath9k/xmit.c
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@ -2082,12 +2082,19 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
if (bf->bf_status & ATH_BUFSTATUS_STALE) {
bf_held = bf;
if (list_is_last(&bf_held->list, &txq->axq_q)) {
/* FIXME:
txq->axq_link = NULL;
txq->axq_linkbuf = NULL;
spin_unlock_bh(&txq->axq_lock);
/*
* The holding descriptor is the last
* descriptor in queue. It's safe to remove
* the last holding descriptor in BH context.
*/
spin_unlock_bh(&txq->axq_lock);
spin_lock_bh(&sc->tx.txbuflock);
list_move_tail(&bf_held->list, &sc->tx.txbuf);
spin_unlock_bh(&sc->tx.txbuflock);
break;
} else {
bf = list_entry(bf_held->list.next,
@ -2115,24 +2122,20 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
*/
lastbf->bf_status |= ATH_BUFSTATUS_STALE;
INIT_LIST_HEAD(&bf_head);
if (!list_is_singular(&lastbf->list))
list_cut_position(&bf_head,
&txq->axq_q, lastbf->list.prev);
txq->axq_depth--;
if (bf_isaggr(bf))
txq->axq_aggr_depth--;
txok = (ds->ds_txstat.ts_status == 0);
spin_unlock_bh(&txq->axq_lock);
if (bf_held) {
list_del(&bf_held->list);
spin_lock_bh(&sc->tx.txbuflock);
list_add_tail(&bf_held->list, &sc->tx.txbuf);
list_move_tail(&bf_held->list, &sc->tx.txbuf);
spin_unlock_bh(&sc->tx.txbuflock);
}