xref: /openbmc/linux/net/mac80211/pm.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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)
10 {
11 	struct ieee80211_local *local = hw_to_local(hw);
12 	struct ieee80211_sub_if_data *sdata;
13 	struct ieee80211_if_init_conf conf;
14 	struct sta_info *sta;
15 	unsigned long flags;
16 
17 	ieee80211_scan_cancel(local);
18 
19 	ieee80211_stop_queues_by_reason(hw,
20 			IEEE80211_QUEUE_STOP_REASON_SUSPEND);
21 
22 	/* flush out all packets */
23 	synchronize_net();
24 
25 	local->quiescing = true;
26 	/* make quiescing visible to timers everywhere */
27 	mb();
28 
29 	flush_workqueue(local->workqueue);
30 
31 	/* Don't try to run timers while suspended. */
32 	del_timer_sync(&local->sta_cleanup);
33 
34 	 /*
35 	 * Note that this particular timer doesn't need to be
36 	 * restarted at resume.
37 	 */
38 	cancel_work_sync(&local->dynamic_ps_enable_work);
39 	del_timer_sync(&local->dynamic_ps_timer);
40 
41 	/* disable keys */
42 	list_for_each_entry(sdata, &local->interfaces, list)
43 		ieee80211_disable_keys(sdata);
44 
45 	/* Tear down aggregation sessions */
46 
47 	rcu_read_lock();
48 
49 	if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
50 		list_for_each_entry_rcu(sta, &local->sta_list, list) {
51 			set_sta_flags(sta, WLAN_STA_SUSPEND);
52 			ieee80211_sta_tear_down_BA_sessions(sta);
53 		}
54 	}
55 
56 	rcu_read_unlock();
57 
58 	/* remove STAs */
59 	spin_lock_irqsave(&local->sta_lock, flags);
60 	list_for_each_entry(sta, &local->sta_list, list) {
61 		if (local->ops->sta_notify) {
62 			sdata = sta->sdata;
63 			if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
64 				sdata = container_of(sdata->bss,
65 					     struct ieee80211_sub_if_data,
66 					     u.ap);
67 
68 			drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
69 				       &sta->sta);
70 		}
71 
72 		mesh_plink_quiesce(sta);
73 	}
74 	spin_unlock_irqrestore(&local->sta_lock, flags);
75 
76 	/* remove all interfaces */
77 	list_for_each_entry(sdata, &local->interfaces, list) {
78 		switch(sdata->vif.type) {
79 		case NL80211_IFTYPE_STATION:
80 			ieee80211_sta_quiesce(sdata);
81 			break;
82 		case NL80211_IFTYPE_ADHOC:
83 			ieee80211_ibss_quiesce(sdata);
84 			break;
85 		case NL80211_IFTYPE_MESH_POINT:
86 			ieee80211_mesh_quiesce(sdata);
87 			break;
88 		case NL80211_IFTYPE_AP_VLAN:
89 		case NL80211_IFTYPE_MONITOR:
90 			/* don't tell driver about this */
91 			continue;
92 		default:
93 			break;
94 		}
95 
96 		if (!netif_running(sdata->dev))
97 			continue;
98 
99 		/* disable beaconing */
100 		ieee80211_bss_info_change_notify(sdata,
101 			BSS_CHANGED_BEACON_ENABLED);
102 
103 		conf.vif = &sdata->vif;
104 		conf.type = sdata->vif.type;
105 		conf.mac_addr = sdata->dev->dev_addr;
106 		drv_remove_interface(local, &conf);
107 	}
108 
109 	/* stop hardware - this must stop RX */
110 	if (local->open_count)
111 		ieee80211_stop_device(local);
112 
113 	local->suspended = true;
114 	/* need suspended to be visible before quiescing is false */
115 	barrier();
116 	local->quiescing = false;
117 
118 	return 0;
119 }
120 
121 /*
122  * __ieee80211_resume() is a static inline which just calls
123  * ieee80211_reconfig(), which is also needed for hardware
124  * hang/firmware failure/etc. recovery.
125  */
126