From dcfcbd590d91e8385eb554aaed419bdebaf4c72a Mon Sep 17 00:00:00 2001 From: Rajkumar Manoharan Date: Thu, 23 Jun 2011 13:39:13 +0530 Subject: [PATCH] ath9k_hw: Fix false tx hung detection in AR9003 chips The edma based (AR9003 family) chips update tx status descriptors in a common ring buffer for all transmitted frames. Whenever tx interrupt is raised, the descriptors are processed and tx status index is moved. The complete tx stauts ring are updated with beacons tx status when there are no data frames to be sent for a period of time. In this state, transmitting data frames causes the driver to wait for the tx status on an incorrect tx status index though the status was updated by hw properly. The driver detects this condition as a h/w hang and does unnecessary chip resets. This issue was orginally reported in adhoc mode while sending frames after an idle time. Signed-off-by: Rajkumar Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/ar9003_mac.c | 8 ++++++-- drivers/net/wireless/ath/ath9k/beacon.c | 6 ++++++ 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.c b/drivers/net/wireless/ath/ath9k/ar9003_mac.c index 04e6be04acf9..575e185f454f 100644 --- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c +++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c @@ -229,6 +229,7 @@ static void ar9003_hw_fill_txdesc(struct ath_hw *ah, void *ds, u32 seglen, static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, struct ath_tx_status *ts) { + struct ar9003_txc *txc = (struct ar9003_txc *) ds; struct ar9003_txs *ads; u32 status; @@ -238,7 +239,11 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, if ((status & AR_TxDone) == 0) return -EINPROGRESS; - ah->ts_tail = (ah->ts_tail + 1) % ah->ts_size; + ts->qid = MS(ads->ds_info, AR_TxQcuNum); + if (!txc || (MS(txc->info, AR_TxQcuNum) == ts->qid)) + ah->ts_tail = (ah->ts_tail + 1) % ah->ts_size; + else + return -ENOENT; if ((MS(ads->ds_info, AR_DescId) != ATHEROS_VENDOR_ID) || (MS(ads->ds_info, AR_TxRxDesc) != 1)) { @@ -254,7 +259,6 @@ static int ar9003_hw_proc_txdesc(struct ath_hw *ah, void *ds, ts->ts_seqnum = MS(status, AR_SeqNum); ts->tid = MS(status, AR_TxTid); - ts->qid = MS(ads->ds_info, AR_TxQcuNum); ts->desc_id = MS(ads->status1, AR_TxDescId); ts->ts_tstamp = ads->status4; ts->ts_status = 0; diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c index 0174cdb65a83..0b6e3b65bb0b 100644 --- a/drivers/net/wireless/ath/ath9k/beacon.c +++ b/drivers/net/wireless/ath/ath9k/beacon.c @@ -360,6 +360,7 @@ void ath_beacon_tasklet(unsigned long data) struct ath_common *common = ath9k_hw_common(ah); struct ath_buf *bf = NULL; struct ieee80211_vif *vif; + struct ath_tx_status ts; int slot; u32 bfaddr, bc = 0; @@ -464,6 +465,11 @@ void ath_beacon_tasklet(unsigned long data) ath9k_hw_txstart(ah, sc->beacon.beaconq); sc->beacon.ast_be_xmit += bc; /* XXX per-vif? */ + if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) { + spin_lock_bh(&sc->sc_pcu_lock); + ath9k_hw_txprocdesc(ah, bf->bf_desc, (void *)&ts); + spin_unlock_bh(&sc->sc_pcu_lock); + } } } -- 2.20.1