diff options
Diffstat (limited to 'net/mac80211/scan.c')
| -rw-r--r-- | net/mac80211/scan.c | 117 |
1 files changed, 109 insertions, 8 deletions
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index 4233c3d700ce..d56b9da8b28a 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -365,12 +365,11 @@ static int ieee80211_start_sw_scan(struct ieee80211_local *local) ieee80211_bss_info_change_notify( sdata, BSS_CHANGED_BEACON_ENABLED); - if (sdata->vif.type == NL80211_IFTYPE_STATION) { - if (sdata->u.mgd.associated) { - netif_tx_stop_all_queues(sdata->dev); - ieee80211_scan_ps_enable(sdata); - } - } else + /* + * only handle non-STA interfaces here, STA interfaces + * are handled in the scan state machine + */ + if (sdata->vif.type != NL80211_IFTYPE_STATION) netif_tx_stop_all_queues(sdata->dev); } mutex_unlock(&local->iflist_mtx); @@ -474,17 +473,113 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata, static int ieee80211_scan_state_decision(struct ieee80211_local *local, unsigned long *next_delay) { - /* if no more bands/channels left, complete scan */ + bool associated = false; + struct ieee80211_sub_if_data *sdata; + + /* if no more bands/channels left, complete scan and advance to the idle state */ if (local->scan_channel_idx >= local->scan_req->n_channels) { ieee80211_scan_completed(&local->hw, false); return 1; } + /* check if at least one STA interface is associated */ + mutex_lock(&local->iflist_mtx); + list_for_each_entry(sdata, &local->interfaces, list) { + if (!netif_running(sdata->dev)) + continue; + + if (sdata->vif.type == NL80211_IFTYPE_STATION) { + if (sdata->u.mgd.associated) { + associated = true; + break; + } + } + } + mutex_unlock(&local->iflist_mtx); + + if (local->scan_channel) { + /* + * we're currently scanning a different channel, let's + * switch back to the operating channel now if at least + * one interface is associated. Otherwise just scan the + * next channel + */ + if (associated) + local->scan_state = SCAN_ENTER_OPER_CHANNEL; + else + local->scan_state = SCAN_SET_CHANNEL; + } else { + /* + * we're on the operating channel currently, let's + * leave that channel now to scan another one + */ + local->scan_state = SCAN_LEAVE_OPER_CHANNEL; + } + *next_delay = 0; - local->scan_state = SCAN_SET_CHANNEL; return 0; } +static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, + unsigned long *next_delay) +{ + struct ieee80211_sub_if_data *sdata; + + /* + * notify the AP about us leaving the channel and stop all STA interfaces + */ + mutex_lock(&local->iflist_mtx); + list_for_each_entry(sdata, &local->interfaces, list) { + if (!netif_running(sdata->dev)) + continue; + + if (sdata->vif.type == NL80211_IFTYPE_STATION) { + netif_tx_stop_all_queues(sdata->dev); + if (sdata->u.mgd.associated) + ieee80211_scan_ps_enable(sdata); + } + } + mutex_unlock(&local->iflist_mtx); + + __set_bit(SCAN_OFF_CHANNEL, &local->scanning); + + /* advance to the next channel to be scanned */ + *next_delay = HZ / 10; + local->scan_state = SCAN_SET_CHANNEL; +} + +static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *local, + unsigned long *next_delay) +{ + struct ieee80211_sub_if_data *sdata = local->scan_sdata; + + /* switch back to the operating channel */ + local->scan_channel = NULL; + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); + + /* + * notify the AP about us being back and restart all STA interfaces + */ + mutex_lock(&local->iflist_mtx); + list_for_each_entry(sdata, &local->interfaces, list) { + if (!netif_running(sdata->dev)) + continue; + + /* Tell AP we're back */ + if (sdata->vif.type == NL80211_IFTYPE_STATION) { + if (sdata->u.mgd.associated) + ieee80211_scan_ps_disable(sdata); + netif_tx_wake_all_queues(sdata->dev); + } + } + mutex_unlock(&local->iflist_mtx); + + __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); + + *next_delay = HZ / 5; + local->scan_state = SCAN_DECISION; +} + static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, unsigned long *next_delay) { @@ -609,6 +704,12 @@ void ieee80211_scan_work(struct work_struct *work) case SCAN_SEND_PROBE: ieee80211_scan_state_send_probe(local, &next_delay); break; + case SCAN_LEAVE_OPER_CHANNEL: + ieee80211_scan_state_leave_oper_channel(local, &next_delay); + break; + case SCAN_ENTER_OPER_CHANNEL: + ieee80211_scan_state_enter_oper_channel(local, &next_delay); + break; } } while (next_delay == 0); |