aboutsummaryrefslogtreecommitdiff
path: root/net/mac80211/pm.c
blob: af49ac4f08261ec8f199591bbd1155f8c5f97a1d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
#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;

			drv_sta_remove(local, sta->sdata, &sta->sta);

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

	/* 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.
 */