summaryrefslogtreecommitdiff
path: root/net/mac80211/pm.c
blob: 00a43a70e1fc30eedb09ab9dcdde8af2a9c89673 (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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
#include <net/mac80211.h>
#include <net/rtnetlink.h>

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

static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
{
	if (ieee80211_request_sched_scan_stop(local))
		return;
	cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
}

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);

	ieee80211_dfs_cac_cancel(local);

	ieee80211_roc_purge(local, NULL);

	ieee80211_del_virtual_monitor(local);

	if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
	    !(wowlan && wowlan->any)) {
		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, AGG_STOP_LOCAL_REQUEST);
		}
		mutex_unlock(&local->sta_mtx);
	}

	/* keep sched_scan only in case of 'any' trigger */
	if (!(wowlan && wowlan->any))
		ieee80211_sched_scan_cancel(local);

	ieee80211_stop_queues_by_reason(hw,
					IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
					false);

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

	ieee80211_flush_queues(local, NULL, true);

	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;
	if (local->wowlan) {
		int err;

		/* Drivers don't expect to suspend while some operations like
		 * authenticating or associating are in progress. It doesn't
		 * make sense anyway to accept that, since the authentication
		 * or association would never finish since the driver can't do
		 * that on its own.
		 * Thus, clean up in-progress auth/assoc first.
		 */
		list_for_each_entry(sdata, &local->interfaces, list) {
			if (!ieee80211_sdata_running(sdata))
				continue;
			if (sdata->vif.type != NL80211_IFTYPE_STATION)
				continue;
			ieee80211_mgd_quiesce(sdata);
			/* If suspended during TX in progress, and wowlan
			 * is enabled (connection will be active) there
			 * can be a race where the driver is put out
			 * of power-save due to TX and during suspend
			 * dynamic_ps_timer is cancelled and TX packet
			 * is flushed, leaving the driver in ACTIVE even
			 * after resuming until dynamic_ps_timer puts
			 * driver back in DOZE.
			 */
			if (sdata->u.mgd.associated &&
			    sdata->u.mgd.powersave &&
			     !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
				local->hw.conf.flags |= IEEE80211_CONF_PS;
				ieee80211_hw_config(local,
						    IEEE80211_CONF_CHANGE_PS);
			}
		}

		err = drv_suspend(local, wowlan);
		if (err < 0) {
			local->quiescing = false;
			local->wowlan = false;
			if (ieee80211_hw_check(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_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
					false);
			return err;
		} else if (err > 0) {
			WARN_ON(err != 1);
			/* cfg80211 will call back into mac80211 to disconnect
			 * all interfaces, allow that to proceed properly
			 */
			ieee80211_wake_queues_by_reason(hw,
					IEEE80211_MAX_QUEUE_MAP,
					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
					false);
			return err;
		} else {
			goto suspend;
		}
	}

	/* remove all interfaces that were created in the driver */
	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!ieee80211_sdata_running(sdata))
			continue;
		switch (sdata->vif.type) {
		case NL80211_IFTYPE_AP_VLAN:
		case NL80211_IFTYPE_MONITOR:
			continue;
		case NL80211_IFTYPE_STATION:
			ieee80211_mgd_quiesce(sdata);
			break;
		case NL80211_IFTYPE_WDS:
			/* tear down aggregation sessions and remove STAs */
			mutex_lock(&local->sta_mtx);
			sta = sdata->u.wds.sta;
			if (sta && 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));
			}
			mutex_unlock(&local->sta_mtx);
			break;
		default:
			break;
		}

		drv_remove_interface(local, sdata);
	}

	/*
	 * We disconnected on all interfaces before suspend, all channel
	 * contexts should be released.
	 */
	WARN_ON(!list_empty(&local->chanctx_list));

	/* 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.
 */

void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
				    struct cfg80211_wowlan_wakeup *wakeup,
				    gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
}
EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);