diff options
Diffstat (limited to 'sys/dev/ath/if_ath.c')
| -rw-r--r-- | sys/dev/ath/if_ath.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/sys/dev/ath/if_ath.c b/sys/dev/ath/if_ath.c index f0b5328..a71b3f8 100644 --- a/sys/dev/ath/if_ath.c +++ b/sys/dev/ath/if_ath.c @@ -4000,20 +4000,19 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq, int dosched) break; } ATH_TXQ_REMOVE(txq, bf, bf_list); - - /* - * Always mark the last buffer in this list as busy. - * - * The hardware may re-read the holding descriptor - * even if we hit the end of the list and try writing - * a new TxDP. - * - * If there's no holding descriptor then this is the - * last buffer in the list of buffers after a fresh - * reset; it'll soon become the holding buffer. - */ - bf->bf_last->bf_flags |= ATH_BUF_BUSY; - + if (txq->axq_depth > 0) { + /* + * More frames follow. Mark the buffer busy + * so it's not re-used while the hardware may + * still re-read the link field in the descriptor. + * + * Use the last buffer in an aggregate as that + * is where the hardware may be - intermediate + * descriptors won't be "busy". + */ + bf->bf_last->bf_flags |= ATH_BUF_BUSY; + } else + txq->axq_link = NULL; if (bf->bf_state.bfs_aggr) txq->axq_aggr_depth--; |
