pm.c

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#include <net/mac80211.h>
#include <net/rtnetlink.h>

#include "ieee80211_i.h"
#include "mesh.h"
#include "driver-ops.h"
#include "led.h"

/* return value indicates whether the driver should be further notified */
static bool ieee80211_quiesce(struct ieee80211_sub_if_data *sdata)
{
        switch (sdata->vif.type) {
        case NL80211_IFTYPE_STATION:
                ieee80211_sta_quiesce(sdata);
                return true;
        case NL80211_IFTYPE_ADHOC:
                ieee80211_ibss_quiesce(sdata);
                return true;
        case NL80211_IFTYPE_MESH_POINT:
                ieee80211_mesh_quiesce(sdata);
                return true;
        case NL80211_IFTYPE_AP_VLAN:
        case NL80211_IFTYPE_MONITOR:
                /* don't tell driver about this */
                return false;
        default:
                return true;
        }
}

int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
{
        struct ieee80211_local *local = hw_to_local(hw);
        struct ieee80211_sub_if_data *sdata;
        struct sta_info *sta;

        if (!local->open_count)
                goto suspend;

        ieee80211_scan_cancel(local);

        if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
                mutex_lock(&local->sta_mtx);
                list_for_each_entry(sta, &local->sta_list, list) {
                        set_sta_flag(sta, WLAN_STA_BLOCK_BA);
                        ieee80211_sta_tear_down_BA_sessions(sta, true);
                }
                mutex_unlock(&local->sta_mtx);
        }

        ieee80211_stop_queues_by_reason(hw,
                        IEEE80211_QUEUE_STOP_REASON_SUSPEND);

        /* flush out all packets */
        synchronize_net();

        drv_flush(local, false);

        local->quiescing = true;
        /* make quiescing visible to timers everywhere */
        mb();

        flush_workqueue(local->workqueue);

        /* Don't try to run timers while suspended. */
        del_timer_sync(&local->sta_cleanup);

         /*
         * Note that this particular timer doesn't need to be
         * restarted at resume.
         */
        cancel_work_sync(&local->dynamic_ps_enable_work);
        del_timer_sync(&local->dynamic_ps_timer);

        local->wowlan = wowlan && local->open_count;
        if (local->wowlan) {
                int err = drv_suspend(local, wowlan);
                if (err < 0) {
                        local->quiescing = false;
                        return err;
                } else if (err > 0) {
                        WARN_ON(err != 1);
                        local->wowlan = false;
                } else {
                        list_for_each_entry(sdata, &local->interfaces, list) {
                                cancel_work_sync(&sdata->work);
                                ieee80211_quiesce(sdata);
                        }
                        goto suspend;
                }
        }

        /* disable keys */
        list_for_each_entry(sdata, &local->interfaces, list)
                ieee80211_disable_keys(sdata);

        /* tear down aggregation sessions and remove STAs */
        mutex_lock(&local->sta_mtx);
        list_for_each_entry(sta, &local->sta_list, list) {
                if (sta->uploaded) {
                        enum ieee80211_sta_state state;

                        state = sta->sta_state;
                        for (; state > IEEE80211_STA_NOTEXIST; state--)
                                WARN_ON(drv_sta_state(local, sta->sdata, sta,
                                                      state, state - 1));
                }

                mesh_plink_quiesce(sta);
        }
        mutex_unlock(&local->sta_mtx);

        /* remove all interfaces */
        list_for_each_entry(sdata, &local->interfaces, list) {
                cancel_work_sync(&sdata->work);

                if (!ieee80211_quiesce(sdata))
                        continue;

                if (!ieee80211_sdata_running(sdata))
                        continue;

                /* disable beaconing */
                ieee80211_bss_info_change_notify(sdata,
                        BSS_CHANGED_BEACON_ENABLED);

                drv_remove_interface(local, sdata);
        }

        sdata = rtnl_dereference(local->monitor_sdata);
        if (sdata)
                drv_remove_interface(local, sdata);

        /* stop hardware - this must stop RX */
        if (local->open_count)
                ieee80211_stop_device(local);

 suspend:
        local->suspended = true;
        /* need suspended to be visible before quiescing is false */
        barrier();
        local->quiescing = false;

        return 0;
}

/*
 * __ieee80211_resume() is a static inline which just calls
 * ieee80211_reconfig(), which is also needed for hardware
 * hang/firmware failure/etc. recovery.
 */