diff options
| -rw-r--r-- | net/mac80211/agg-tx.c | 23 | ||||
| -rw-r--r-- | net/mac80211/ht.c | 27 | ||||
| -rw-r--r-- | net/mac80211/sta_info.h | 4 |
3 files changed, 42 insertions, 12 deletions
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c index 63d852cb4ca..f614ee60208 100644 --- a/net/mac80211/agg-tx.c +++ b/net/mac80211/agg-tx.c @@ -136,6 +136,14 @@ void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u1 ieee80211_tx_skb(sdata, skb); } +void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, + struct tid_ampdu_tx *tid_tx) +{ + lockdep_assert_held(&sta->ampdu_mlme.mtx); + lockdep_assert_held(&sta->lock); + rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); +} + static void kfree_tid_tx(struct rcu_head *rcu_head) { struct tid_ampdu_tx *tid_tx = @@ -161,7 +169,7 @@ int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid, if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { /* not even started yet! */ - rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); + ieee80211_assign_tid_tx(sta, tid, NULL); spin_unlock_bh(&sta->lock); call_rcu(&tid_tx->rcu_head, kfree_tid_tx); return 0; @@ -318,7 +326,7 @@ void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid) " tid %d\n", tid); #endif spin_lock_bh(&sta->lock); - rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); + ieee80211_assign_tid_tx(sta, tid, NULL); spin_unlock_bh(&sta->lock); ieee80211_wake_queue_agg(local, tid); @@ -398,7 +406,7 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, tid_tx = sta->ampdu_mlme.tid_tx[tid]; /* check if the TID is not in aggregation flow already */ - if (tid_tx) { + if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) { #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "BA request denied - session is not " "idle on tid %u\n", tid); @@ -433,8 +441,11 @@ int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid, sta->ampdu_mlme.dialog_token_allocator++; tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator; - /* finally, assign it to the array */ - rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx); + /* + * Finally, assign it to the start array; the work item will + * collect it and move it to the normal array. + */ + sta->ampdu_mlme.tid_start_tx[tid] = tid_tx; ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work); @@ -697,7 +708,7 @@ void ieee80211_stop_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u8 tid) ieee80211_agg_splice_packets(local, tid_tx, tid); /* future packets must not find the tid_tx struct any more */ - rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL); + ieee80211_assign_tid_tx(sta, tid, NULL); ieee80211_agg_splice_finish(local, tid); diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c index b9e4b9bd217..9f5842a4311 100644 --- a/net/mac80211/ht.c +++ b/net/mac80211/ht.c @@ -140,14 +140,29 @@ void ieee80211_ba_session_work(struct work_struct *work) sta, tid, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_TIMEOUT, true); - tid_tx = sta->ampdu_mlme.tid_tx[tid]; - if (!tid_tx) - continue; + tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; + if (tid_tx) { + /* + * Assign it over to the normal tid_tx array + * where it "goes live". + */ + spin_lock_bh(&sta->lock); + + sta->ampdu_mlme.tid_start_tx[tid] = NULL; + /* could there be a race? */ + if (sta->ampdu_mlme.tid_tx[tid]) + kfree(tid_tx); + else + ieee80211_assign_tid_tx(sta, tid, tid_tx); + spin_unlock_bh(&sta->lock); - if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) ieee80211_tx_ba_session_handle_start(sta, tid); - else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, - &tid_tx->state)) + continue; + } + + tid_tx = sta->ampdu_mlme.tid_tx[tid]; + if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, + &tid_tx->state)) ___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR, true); diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index f00b4dcb49d..55c51855ceb 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -152,6 +152,7 @@ struct tid_ampdu_rx { * * @tid_rx: aggregation info for Rx per TID -- RCU protected * @tid_tx: aggregation info for Tx per TID + * @tid_start_tx: sessions where start was requested * @addba_req_num: number of times addBA request has been sent. * @dialog_token_allocator: dialog token enumerator for each new session; * @work: work struct for starting/stopping aggregation @@ -168,6 +169,7 @@ struct sta_ampdu_mlme { /* tx */ struct work_struct work; struct tid_ampdu_tx *tid_tx[STA_TID_NUM]; + struct tid_ampdu_tx *tid_start_tx[STA_TID_NUM]; u8 addba_req_num[STA_TID_NUM]; u8 dialog_token_allocator; }; @@ -398,6 +400,8 @@ static inline u32 get_sta_flags(struct sta_info *sta) return ret; } +void ieee80211_assign_tid_tx(struct sta_info *sta, int tid, + struct tid_ampdu_tx *tid_tx); #define STA_HASH_SIZE 256 |