From d22b0022e75b37e5c5a995754fcf9f61b39022d2 Mon Sep 17 00:00:00 2001 From: Sujith Date: Wed, 28 Jan 2009 11:55:45 +0530 Subject: [PATCH] ath9k: Fix lockdep warning This patch fixes the lockdep warning shown below, and also initializes the starting sequence number when starting a TX aggregation session. ============================================= [ INFO: possible recursive locking detected ] 2.6.29-rc2-wl #21 --------------------------------------------- swapper/0 is trying to acquire lock: (_xmit_IEEE80211#2){-+..}, at: [] __qdisc_run+0x221/0x290 but task is already holding lock: (_xmit_IEEE80211#2){-+..}, at: [] __qdisc_run+0x221/0x290 other info that might help us debug this: 7 locks held by swapper/0: #0: (rcu_read_lock){..--}, at: [] dev_queue_xmit+0x53/0x620 #1: (_xmit_ETHER#2){-+..}, at: [] __qdisc_run+0x221/0x290 #2: (rcu_read_lock){..--}, at: [] dev_queue_xmit+0x53/0x620 #3: (_xmit_IEEE80211#2){-+..}, at: [] __qdisc_run+0x221/0x290 #4: (rcu_read_lock){..--}, at: [] ieee80211_master_start_xmit+0x219/0x6c0 [mac80211] #5: (rcu_read_lock){..--}, at: [] ieee80211_start_tx_ba_session+0x66/0x4e0 [mac80211] #6: (rcu_read_lock){..--}, at: [] dev_queue_xmit+0x53/0x620 stack backtrace: Pid: 0, comm: swapper Not tainted 2.6.29-rc2-wl #21 Call Trace: [] __lock_acquire+0x1be9/0x1c40 [] dev_queue_xmit+0xe1/0x620 [] __lock_acquire+0x18c/0x1c40 [] lock_acquire+0x55/0x70 [] __qdisc_run+0x221/0x290 [] _spin_lock+0x39/0x50 [] __qdisc_run+0x221/0x290 [] _spin_unlock+0x1f/0x50 [] __qdisc_run+0x221/0x290 [] dev_queue_xmit+0x308/0x620 [] dev_queue_xmit+0x53/0x620 [] ieee80211_start_tx_ba_session+0x303/0x4e0 [mac80211] [] ieee80211_start_tx_ba_session+0x66/0x4e0 [mac80211] [] rate_control_get_rate+0xae/0xc0 [mac80211] [] invoke_tx_handlers+0x655/0x1000 [mac80211] [] mark_held_locks+0x4d/0x90 [] _spin_unlock_irqrestore+0x65/0x80 [] __ieee80211_tx_prepare+0x16a/0x310 [mac80211] [] __ieee80211_tx_prepare+0x19c/0x310 [mac80211] [] pskb_expand_head+0x112/0x190 [] ieee80211_master_start_xmit+0x286/0x6c0 [mac80211] [] ieee80211_master_start_xmit+0x219/0x6c0 [mac80211] [] __lock_acquire+0x18c/0x1c40 [] __qdisc_run+0x23e/0x290 [] dev_queue_xmit+0x308/0x620 [] dev_queue_xmit+0x53/0x620 [] ieee80211_subif_start_xmit+0x4a1/0x980 [mac80211] [] ieee80211_subif_start_xmit+0x198/0x980 [mac80211] [] __qdisc_run+0x23e/0x290 [] dev_queue_xmit+0x308/0x620 [] dev_queue_xmit+0x53/0x620 [] ip6_output+0x62d/0x1230 [ipv6] [] __mod_timer+0xb0/0xd0 [] mld_sendpack+0x3fa/0x4a0 [ipv6] [] mld_sendpack+0x0/0x4a0 [ipv6] [] mld_ifc_timer_expire+0x0/0x340 [ipv6] [] mld_ifc_timer_expire+0x289/0x340 [ipv6] [] mld_ifc_timer_expire+0x0/0x340 [ipv6] [] run_timer_softirq+0x147/0x220 [] __do_softirq+0x9b/0x180 [] tick_dev_program_event+0x36/0xb0 [] call_softirq+0x1c/0x30 [] do_softirq+0x65/0xb0 [] irq_exit+0x9d/0xc0 [] smp_apic_timer_interrupt+0x86/0xd0 [] apic_timer_interrupt+0x13/0x20 Signed-off-by: Sujith Signed-off-by: John W. Linville --- drivers/net/wireless/ath9k/rc.c | 30 ++++++++++++++---------------- drivers/net/wireless/ath9k/xmit.c | 1 + 2 files changed, 15 insertions(+), 16 deletions(-) diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c index eb557add6567..61c86c4f9fc4 100644 --- a/drivers/net/wireless/ath9k/rc.c +++ b/drivers/net/wireless/ath9k/rc.c @@ -1479,6 +1479,20 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband, (is_underrun) ? ATH_11N_TXMAXTRY : tx_info_priv->tx.ts_longretry); + /* Check if aggregation has to be enabled for this tid */ + if (conf_is_ht(&sc->hw->conf)) { + if (ieee80211_is_data_qos(fc)) { + u8 *qc, tid; + struct ath_node *an; + + qc = ieee80211_get_qos_ctl(hdr); + tid = qc[0] & 0xf; + an = (struct ath_node *)sta->drv_priv; + + if(ath_tx_aggr_check(sc, an, tid)) + ieee80211_start_tx_ba_session(sc->hw, hdr->addr1, tid); + } + } exit: kfree(tx_info_priv); } @@ -1490,7 +1504,6 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, struct sk_buff *skb = txrc->skb; struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ath_softc *sc = priv; - struct ieee80211_hw *hw = sc->hw; struct ath_rate_priv *ath_rc_priv = priv_sta; struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); int is_probe = 0; @@ -1508,21 +1521,6 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta, /* Find tx rate for unicast frames */ ath_rc_ratefind(sc, ath_rc_priv, ATH_11N_TXMAXTRY, 4, tx_info, &is_probe, false); - - /* Check if aggregation has to be enabled for this tid */ - if (conf_is_ht(&hw->conf)) { - if (ieee80211_is_data_qos(fc)) { - u8 *qc, tid; - struct ath_node *an; - - qc = ieee80211_get_qos_ctl(hdr); - tid = qc[0] & 0xf; - an = (struct ath_node *)sta->drv_priv; - - if(ath_tx_aggr_check(sc, an, tid)) - ieee80211_start_tx_ba_session(hw, hdr->addr1, tid); - } - } } static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband, diff --git a/drivers/net/wireless/ath9k/xmit.c b/drivers/net/wireless/ath9k/xmit.c index 007ca91188d1..d483f3c13501 100644 --- a/drivers/net/wireless/ath9k/xmit.c +++ b/drivers/net/wireless/ath9k/xmit.c @@ -677,6 +677,7 @@ int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta, txtid = ATH_AN_2_TID(an, tid); txtid->state |= AGGR_ADDBA_PROGRESS; ath_tx_pause_tid(sc, txtid); + *ssn = txtid->seq_start; } return 0; -- 2.30.2