diff --git a/include/net/mac80211.h b/include/net/mac80211.h index bdb4a7cbab31a74aab7cd36934beef096753e1ff..3541c48a97cd1350e8f4a12e87d6db707ffcf537 100644 --- a/include/net/mac80211.h +++ b/include/net/mac80211.h @@ -1113,7 +1113,9 @@ enum ieee80211_vif_flags { * @addr: address of this interface * @p2p: indicates whether this AP or STA interface is a p2p * interface, i.e. a GO or p2p-sta respectively - * @csa_active: marks whether a channel switch is going on + * @csa_active: marks whether a channel switch is going on. Internally it is + * write-protected by sdata_lock and local->mtx so holding either is fine + * for read access. * @driver_flags: flags/capabilities the driver has for this interface, * these need to be set (or cleared) when the interface is added * or, if supported by the driver, the interface type is changed diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c index 19a7e6ff45d316eaf36acc737d774cf7d428ff78..f789c3198af4a1ecfb6e807bbc51b06c42b9b0d4 100644 --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1084,6 +1084,31 @@ static int ieee80211_change_beacon(struct wiphy *wiphy, struct net_device *dev, return 0; } +bool ieee80211_csa_needs_block_tx(struct ieee80211_local *local) +{ + struct ieee80211_sub_if_data *sdata; + + lockdep_assert_held(&local->mtx); + + rcu_read_lock(); + list_for_each_entry_rcu(sdata, &local->interfaces, list) { + if (!ieee80211_sdata_running(sdata)) + continue; + + if (!sdata->vif.csa_active) + continue; + + if (!sdata->csa_block_tx) + continue; + + rcu_read_unlock(); + return true; + } + rcu_read_unlock(); + + return false; +} + static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); @@ -1101,7 +1126,14 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev) old_probe_resp = sdata_dereference(sdata->u.ap.probe_resp, sdata); /* abort any running channel switch */ + mutex_lock(&local->mtx); sdata->vif.csa_active = false; + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, + IEEE80211_MAX_QUEUE_MAP, + IEEE80211_QUEUE_STOP_REASON_CSA); + mutex_unlock(&local->mtx); + kfree(sdata->u.ap.next_beacon); sdata->u.ap.next_beacon = NULL; @@ -3027,11 +3059,10 @@ static void ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata) int err, changed = 0; sdata_assert_lock(sdata); + lockdep_assert_held(&local->mtx); - mutex_lock(&local->mtx); sdata->radar_required = sdata->csa_radar_required; err = ieee80211_vif_change_channel(sdata, &changed); - mutex_unlock(&local->mtx); if (WARN_ON(err < 0)) return; @@ -3072,11 +3103,12 @@ static void ieee80211_csa_finalize(struct ieee80211_sub_if_data *sdata) ieee80211_bss_info_change_notify(sdata, changed); - ieee80211_wake_queues_by_reason(&sdata->local->hw, + cfg80211_ch_switch_notify(sdata->dev, &sdata->csa_chandef); + + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_CSA); - - cfg80211_ch_switch_notify(sdata->dev, &sdata->csa_chandef); } void ieee80211_csa_finalize_work(struct work_struct *work) @@ -3084,8 +3116,11 @@ void ieee80211_csa_finalize_work(struct work_struct *work) struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, csa_finalize_work); + struct ieee80211_local *local = sdata->local; sdata_lock(sdata); + mutex_lock(&local->mtx); + /* AP might have been stopped while waiting for the lock. */ if (!sdata->vif.csa_active) goto unlock; @@ -3096,6 +3131,7 @@ void ieee80211_csa_finalize_work(struct work_struct *work) ieee80211_csa_finalize(sdata); unlock: + mutex_unlock(&local->mtx); sdata_unlock(sdata); } @@ -3222,8 +3258,8 @@ static int ieee80211_set_csa_beacon(struct ieee80211_sub_if_data *sdata, return 0; } -int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, - struct cfg80211_csa_settings *params) +int __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, + struct cfg80211_csa_settings *params) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; @@ -3232,6 +3268,7 @@ int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, int err, num_chanctx, changed = 0; sdata_assert_lock(sdata); + lockdep_assert_held(&local->mtx); if (!list_empty(&local->roc_list) || local->scanning) return -EBUSY; @@ -3274,15 +3311,15 @@ int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, return err; sdata->csa_radar_required = params->radar_required; - - if (params->block_tx) - ieee80211_stop_queues_by_reason(&local->hw, - IEEE80211_MAX_QUEUE_MAP, - IEEE80211_QUEUE_STOP_REASON_CSA); - sdata->csa_chandef = params->chandef; + sdata->csa_block_tx = params->block_tx; sdata->vif.csa_active = true; + if (sdata->csa_block_tx) + ieee80211_stop_queues_by_reason(&local->hw, + IEEE80211_MAX_QUEUE_MAP, + IEEE80211_QUEUE_STOP_REASON_CSA); + if (changed) { ieee80211_bss_info_change_notify(sdata, changed); drv_channel_switch_beacon(sdata, ¶ms->chandef); @@ -3294,6 +3331,20 @@ int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, return 0; } +int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, + struct cfg80211_csa_settings *params) +{ + struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); + struct ieee80211_local *local = sdata->local; + int err; + + mutex_lock(&local->mtx); + err = __ieee80211_channel_switch(wiphy, dev, params); + mutex_unlock(&local->mtx); + + return err; +} + static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev, struct cfg80211_mgmt_tx_params *params, u64 *cookie) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index f86d06aaf54b5f8da3ae7a4180ff1b3f3e08fb2f..f4ba0c4a4314e846e6b5aaed4d5e964d63f4f6a6 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -756,6 +756,7 @@ struct ieee80211_sub_if_data { int csa_counter_offset_beacon; int csa_counter_offset_presp; bool csa_radar_required; + bool csa_block_tx; /* write-protected by sdata_lock and local->mtx */ struct cfg80211_chan_def csa_chandef; struct list_head assigned_chanctx_list; /* protected by chanctx_mtx */ @@ -1472,6 +1473,7 @@ void ieee80211_sw_roc_work(struct work_struct *work); void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc); /* channel switch handling */ +bool ieee80211_csa_needs_block_tx(struct ieee80211_local *local); void ieee80211_csa_finalize_work(struct work_struct *work); int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev, struct cfg80211_csa_settings *params); diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 7fff3dcaac43fb93034519a3f1b8b1aaae0579bc..79fc98815da8600511316113e52223de05911d6a 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -838,8 +838,15 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, cancel_work_sync(&sdata->recalc_smps); sdata_lock(sdata); + mutex_lock(&local->mtx); sdata->vif.csa_active = false; + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, + IEEE80211_MAX_QUEUE_MAP, + IEEE80211_QUEUE_STOP_REASON_CSA); + mutex_unlock(&local->mtx); sdata_unlock(sdata); + cancel_work_sync(&sdata->csa_finalize_work); cancel_delayed_work_sync(&sdata->dfs_cac_timer_work); diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 488826f188a7a8a7f903fea8d9249ac9819b6c7c..d68e73cbdcd63a60568a17799d3f46a662c1de69 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -975,16 +975,20 @@ static void ieee80211_chswitch_work(struct work_struct *work) /* XXX: shouldn't really modify cfg80211-owned data! */ ifmgd->associated->channel = sdata->csa_chandef.chan; + ieee80211_bss_info_change_notify(sdata, changed); + + mutex_lock(&local->mtx); + sdata->vif.csa_active = false; /* XXX: wait for a beacon first? */ - ieee80211_wake_queues_by_reason(&local->hw, + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_CSA); + mutex_unlock(&local->mtx); - ieee80211_bss_info_change_notify(sdata, changed); - - out: - sdata->vif.csa_active = false; ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; + +out: sdata_unlock(sdata); } @@ -1100,12 +1104,16 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata, mutex_unlock(&local->chanctx_mtx); sdata->csa_chandef = csa_ie.chandef; + + mutex_lock(&local->mtx); sdata->vif.csa_active = true; + sdata->csa_block_tx = csa_ie.mode; - if (csa_ie.mode) + if (sdata->csa_block_tx) ieee80211_stop_queues_by_reason(&local->hw, - IEEE80211_MAX_QUEUE_MAP, - IEEE80211_QUEUE_STOP_REASON_CSA); + IEEE80211_MAX_QUEUE_MAP, + IEEE80211_QUEUE_STOP_REASON_CSA); + mutex_unlock(&local->mtx); if (local->ops->channel_switch) { /* use driver's channel switch callback */ @@ -1817,6 +1825,12 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata, ifmgd->flags = 0; mutex_lock(&local->mtx); ieee80211_vif_release_channel(sdata); + + sdata->vif.csa_active = false; + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, + IEEE80211_MAX_QUEUE_MAP, + IEEE80211_QUEUE_STOP_REASON_CSA); mutex_unlock(&local->mtx); sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM; @@ -2045,6 +2059,7 @@ EXPORT_SYMBOL(ieee80211_ap_probereq_get); static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) { + struct ieee80211_local *local = sdata->local; struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; @@ -2058,10 +2073,14 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata) WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, true, frame_buf); ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED; + + mutex_lock(&local->mtx); sdata->vif.csa_active = false; - ieee80211_wake_queues_by_reason(&sdata->local->hw, + if (!ieee80211_csa_needs_block_tx(local)) + ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_CSA); + mutex_unlock(&local->mtx); cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf, IEEE80211_DEAUTH_FRAME_LEN);