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;
            local->wowlan = false;
            if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
                mutex_lock(&local->sta_mtx);
                list_for_each_entry(sta,
                            &local->sta_list, list) {
                    clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
                }
                mutex_unlock(&local->sta_mtx);
            }
            ieee80211_wake_queues_by_reason(hw,
                    IEEE80211_QUEUE_STOP_REASON_SUSPEND);
            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.
 */