xref: /openbmc/linux/net/mac80211/pm.c (revision c819e2cf)
1 #include <net/mac80211.h>
2 #include <net/rtnetlink.h>
3 
4 #include "ieee80211_i.h"
5 #include "mesh.h"
6 #include "driver-ops.h"
7 #include "led.h"
8 
9 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
10 {
11 	struct ieee80211_local *local = hw_to_local(hw);
12 	struct ieee80211_sub_if_data *sdata;
13 	struct sta_info *sta;
14 
15 	if (!local->open_count)
16 		goto suspend;
17 
18 	ieee80211_scan_cancel(local);
19 
20 	ieee80211_dfs_cac_cancel(local);
21 
22 	ieee80211_roc_purge(local, NULL);
23 
24 	ieee80211_del_virtual_monitor(local);
25 
26 	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
27 		mutex_lock(&local->sta_mtx);
28 		list_for_each_entry(sta, &local->sta_list, list) {
29 			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
30 			ieee80211_sta_tear_down_BA_sessions(
31 					sta, AGG_STOP_LOCAL_REQUEST);
32 		}
33 		mutex_unlock(&local->sta_mtx);
34 	}
35 
36 	ieee80211_stop_queues_by_reason(hw,
37 					IEEE80211_MAX_QUEUE_MAP,
38 					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
39 					false);
40 
41 	/* flush out all packets */
42 	synchronize_net();
43 
44 	ieee80211_flush_queues(local, NULL);
45 
46 	local->quiescing = true;
47 	/* make quiescing visible to timers everywhere */
48 	mb();
49 
50 	flush_workqueue(local->workqueue);
51 
52 	/* Don't try to run timers while suspended. */
53 	del_timer_sync(&local->sta_cleanup);
54 
55 	 /*
56 	 * Note that this particular timer doesn't need to be
57 	 * restarted at resume.
58 	 */
59 	cancel_work_sync(&local->dynamic_ps_enable_work);
60 	del_timer_sync(&local->dynamic_ps_timer);
61 
62 	local->wowlan = wowlan && local->open_count;
63 	if (local->wowlan) {
64 		int err = drv_suspend(local, wowlan);
65 		if (err < 0) {
66 			local->quiescing = false;
67 			local->wowlan = false;
68 			if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
69 				mutex_lock(&local->sta_mtx);
70 				list_for_each_entry(sta,
71 						    &local->sta_list, list) {
72 					clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
73 				}
74 				mutex_unlock(&local->sta_mtx);
75 			}
76 			ieee80211_wake_queues_by_reason(hw,
77 					IEEE80211_MAX_QUEUE_MAP,
78 					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
79 					false);
80 			return err;
81 		} else if (err > 0) {
82 			WARN_ON(err != 1);
83 			return err;
84 		} else {
85 			goto suspend;
86 		}
87 	}
88 
89 	/* remove all interfaces that were created in the driver */
90 	list_for_each_entry(sdata, &local->interfaces, list) {
91 		if (!ieee80211_sdata_running(sdata))
92 			continue;
93 		switch (sdata->vif.type) {
94 		case NL80211_IFTYPE_AP_VLAN:
95 		case NL80211_IFTYPE_MONITOR:
96 			continue;
97 		case NL80211_IFTYPE_STATION:
98 			ieee80211_mgd_quiesce(sdata);
99 			break;
100 		case NL80211_IFTYPE_WDS:
101 			/* tear down aggregation sessions and remove STAs */
102 			mutex_lock(&local->sta_mtx);
103 			sta = sdata->u.wds.sta;
104 			if (sta && sta->uploaded) {
105 				enum ieee80211_sta_state state;
106 
107 				state = sta->sta_state;
108 				for (; state > IEEE80211_STA_NOTEXIST; state--)
109 					WARN_ON(drv_sta_state(local, sta->sdata,
110 							      sta, state,
111 							      state - 1));
112 			}
113 			mutex_unlock(&local->sta_mtx);
114 			break;
115 		default:
116 			break;
117 		}
118 
119 		drv_remove_interface(local, sdata);
120 	}
121 
122 	/*
123 	 * We disconnected on all interfaces before suspend, all channel
124 	 * contexts should be released.
125 	 */
126 	WARN_ON(!list_empty(&local->chanctx_list));
127 
128 	/* stop hardware - this must stop RX */
129 	if (local->open_count)
130 		ieee80211_stop_device(local);
131 
132  suspend:
133 	local->suspended = true;
134 	/* need suspended to be visible before quiescing is false */
135 	barrier();
136 	local->quiescing = false;
137 
138 	return 0;
139 }
140 
141 /*
142  * __ieee80211_resume() is a static inline which just calls
143  * ieee80211_reconfig(), which is also needed for hardware
144  * hang/firmware failure/etc. recovery.
145  */
146 
147 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
148 				    struct cfg80211_wowlan_wakeup *wakeup,
149 				    gfp_t gfp)
150 {
151 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
152 
153 	cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
154 }
155 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);
156