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Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r--net/mac80211/sta_info.c95
1 files changed, 37 insertions, 58 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 56422d894351..ff0eb948917b 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -93,12 +93,18 @@ struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
- sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
+ sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
while (sta) {
if (sta->sdata == sdata &&
memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
break;
- sta = rcu_dereference(sta->hnext);
+ sta = rcu_dereference_check(sta->hnext,
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
}
return sta;
}
@@ -113,13 +119,19 @@ struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
- sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
+ sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
while (sta) {
if ((sta->sdata == sdata ||
sta->sdata->bss == sdata->bss) &&
memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
break;
- sta = rcu_dereference(sta->hnext);
+ sta = rcu_dereference_check(sta->hnext,
+ rcu_read_lock_held() ||
+ lockdep_is_held(&local->sta_lock) ||
+ lockdep_is_held(&local->sta_mtx));
}
return sta;
}
@@ -238,9 +250,6 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
* enable session_timer's data differentiation. refer to
* sta_rx_agg_session_timer_expired for useage */
sta->timer_to_tid[i] = i;
- /* rx */
- sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
- sta->ampdu_mlme.tid_rx[i] = NULL;
/* tx */
sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
sta->ampdu_mlme.tid_tx[i] = NULL;
@@ -607,7 +616,7 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
struct ieee80211_sub_if_data *sdata;
struct sk_buff *skb;
unsigned long flags;
- int ret, i;
+ int ret;
might_sleep();
@@ -617,6 +626,15 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
local = sta->local;
sdata = sta->sdata;
+ /*
+ * Before removing the station from the driver and
+ * rate control, it might still start new aggregation
+ * sessions -- block that to make sure the tear-down
+ * will be sufficient.
+ */
+ set_sta_flags(sta, WLAN_STA_BLOCK_BA);
+ ieee80211_sta_tear_down_BA_sessions(sta);
+
spin_lock_irqsave(&local->sta_lock, flags);
ret = sta_info_hash_del(local, sta);
/* this might still be the pending list ... which is fine */
@@ -633,9 +651,6 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
* may mean it is removed from hardware which requires that
* the key->sta pointer is still valid, so flush the key todo
* list here.
- *
- * ieee80211_key_todo() will synchronize_rcu() so after this
- * nothing can reference this sta struct any more.
*/
ieee80211_key_todo();
@@ -667,11 +682,17 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
sdata = sta->sdata;
}
+ /*
+ * At this point, after we wait for an RCU grace period,
+ * neither mac80211 nor the driver can reference this
+ * sta struct any more except by still existing timers
+ * associated with this station that we clean up below.
+ */
+ synchronize_rcu();
+
#ifdef CONFIG_MAC80211_MESH
- if (ieee80211_vif_is_mesh(&sdata->vif)) {
+ if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_accept_plinks_update(sdata);
- del_timer(&sta->plink_timer);
- }
#endif
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
@@ -698,50 +719,6 @@ static int __must_check __sta_info_destroy(struct sta_info *sta)
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
dev_kfree_skb_any(skb);
- for (i = 0; i < STA_TID_NUM; i++) {
- struct tid_ampdu_rx *tid_rx;
- struct tid_ampdu_tx *tid_tx;
-
- spin_lock_bh(&sta->lock);
- tid_rx = sta->ampdu_mlme.tid_rx[i];
- /* Make sure timer won't free the tid_rx struct, see below */
- if (tid_rx)
- tid_rx->shutdown = true;
-
- spin_unlock_bh(&sta->lock);
-
- /*
- * Outside spinlock - shutdown is true now so that the timer
- * won't free tid_rx, we have to do that now. Can't let the
- * timer do it because we have to sync the timer outside the
- * lock that it takes itself.
- */
- if (tid_rx) {
- del_timer_sync(&tid_rx->session_timer);
- kfree(tid_rx);
- }
-
- /*
- * No need to do such complications for TX agg sessions, the
- * path leading to freeing the tid_tx struct goes via a call
- * from the driver, and thus needs to look up the sta struct
- * again, which cannot be found when we get here. Hence, we
- * just need to delete the timer and free the aggregation
- * info; we won't be telling the peer about it then but that
- * doesn't matter if we're not talking to it again anyway.
- */
- tid_tx = sta->ampdu_mlme.tid_tx[i];
- if (tid_tx) {
- del_timer_sync(&tid_tx->addba_resp_timer);
- /*
- * STA removed while aggregation session being
- * started? Bit odd, but purge frames anyway.
- */
- skb_queue_purge(&tid_tx->pending);
- kfree(tid_tx);
- }
- }
-
__sta_info_free(local, sta);
return 0;
@@ -980,6 +957,8 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
{
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ trace_api_sta_block_awake(sta->local, pubsta, block);
+
if (block)
set_sta_flags(sta, WLAN_STA_PS_DRIVER);
else
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 05:37:49 +0100