PageRenderTime 37ms CodeModel.GetById 27ms app.highlight 7ms RepoModel.GetById 2ms app.codeStats 0ms

/net/mac80211/pm.c

http://github.com/mirrors/linux
C | 208 lines | 137 code | 30 blank | 41 comment | 22 complexity | c0da2542dbdf7414f114ef2f28d51b8b MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0
  2#include <net/mac80211.h>
  3#include <net/rtnetlink.h>
  4
  5#include "ieee80211_i.h"
  6#include "mesh.h"
  7#include "driver-ops.h"
  8#include "led.h"
  9
 10static void ieee80211_sched_scan_cancel(struct ieee80211_local *local)
 11{
 12	if (ieee80211_request_sched_scan_stop(local))
 13		return;
 14	cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
 15}
 16
 17int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 18{
 19	struct ieee80211_local *local = hw_to_local(hw);
 20	struct ieee80211_sub_if_data *sdata;
 21	struct sta_info *sta;
 22
 23	if (!local->open_count)
 24		goto suspend;
 25
 26	ieee80211_scan_cancel(local);
 27
 28	ieee80211_dfs_cac_cancel(local);
 29
 30	ieee80211_roc_purge(local, NULL);
 31
 32	ieee80211_del_virtual_monitor(local);
 33
 34	if (ieee80211_hw_check(hw, AMPDU_AGGREGATION) &&
 35	    !(wowlan && wowlan->any)) {
 36		mutex_lock(&local->sta_mtx);
 37		list_for_each_entry(sta, &local->sta_list, list) {
 38			set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 39			ieee80211_sta_tear_down_BA_sessions(
 40					sta, AGG_STOP_LOCAL_REQUEST);
 41		}
 42		mutex_unlock(&local->sta_mtx);
 43	}
 44
 45	/* keep sched_scan only in case of 'any' trigger */
 46	if (!(wowlan && wowlan->any))
 47		ieee80211_sched_scan_cancel(local);
 48
 49	ieee80211_stop_queues_by_reason(hw,
 50					IEEE80211_MAX_QUEUE_MAP,
 51					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
 52					false);
 53
 54	/* flush out all packets */
 55	synchronize_net();
 56
 57	ieee80211_flush_queues(local, NULL, true);
 58
 59	local->quiescing = true;
 60	/* make quiescing visible to timers everywhere */
 61	mb();
 62
 63	flush_workqueue(local->workqueue);
 64
 65	/* Don't try to run timers while suspended. */
 66	del_timer_sync(&local->sta_cleanup);
 67
 68	 /*
 69	 * Note that this particular timer doesn't need to be
 70	 * restarted at resume.
 71	 */
 72	cancel_work_sync(&local->dynamic_ps_enable_work);
 73	del_timer_sync(&local->dynamic_ps_timer);
 74
 75	local->wowlan = wowlan;
 76	if (local->wowlan) {
 77		int err;
 78
 79		/* Drivers don't expect to suspend while some operations like
 80		 * authenticating or associating are in progress. It doesn't
 81		 * make sense anyway to accept that, since the authentication
 82		 * or association would never finish since the driver can't do
 83		 * that on its own.
 84		 * Thus, clean up in-progress auth/assoc first.
 85		 */
 86		list_for_each_entry(sdata, &local->interfaces, list) {
 87			if (!ieee80211_sdata_running(sdata))
 88				continue;
 89			if (sdata->vif.type != NL80211_IFTYPE_STATION)
 90				continue;
 91			ieee80211_mgd_quiesce(sdata);
 92			/* If suspended during TX in progress, and wowlan
 93			 * is enabled (connection will be active) there
 94			 * can be a race where the driver is put out
 95			 * of power-save due to TX and during suspend
 96			 * dynamic_ps_timer is cancelled and TX packet
 97			 * is flushed, leaving the driver in ACTIVE even
 98			 * after resuming until dynamic_ps_timer puts
 99			 * driver back in DOZE.
100			 */
101			if (sdata->u.mgd.associated &&
102			    sdata->u.mgd.powersave &&
103			     !(local->hw.conf.flags & IEEE80211_CONF_PS)) {
104				local->hw.conf.flags |= IEEE80211_CONF_PS;
105				ieee80211_hw_config(local,
106						    IEEE80211_CONF_CHANGE_PS);
107			}
108		}
109
110		err = drv_suspend(local, wowlan);
111		if (err < 0) {
112			local->quiescing = false;
113			local->wowlan = false;
114			if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
115				mutex_lock(&local->sta_mtx);
116				list_for_each_entry(sta,
117						    &local->sta_list, list) {
118					clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
119				}
120				mutex_unlock(&local->sta_mtx);
121			}
122			ieee80211_wake_queues_by_reason(hw,
123					IEEE80211_MAX_QUEUE_MAP,
124					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
125					false);
126			return err;
127		} else if (err > 0) {
128			WARN_ON(err != 1);
129			/* cfg80211 will call back into mac80211 to disconnect
130			 * all interfaces, allow that to proceed properly
131			 */
132			ieee80211_wake_queues_by_reason(hw,
133					IEEE80211_MAX_QUEUE_MAP,
134					IEEE80211_QUEUE_STOP_REASON_SUSPEND,
135					false);
136			return err;
137		} else {
138			goto suspend;
139		}
140	}
141
142	/* remove all interfaces that were created in the driver */
143	list_for_each_entry(sdata, &local->interfaces, list) {
144		if (!ieee80211_sdata_running(sdata))
145			continue;
146		switch (sdata->vif.type) {
147		case NL80211_IFTYPE_AP_VLAN:
148		case NL80211_IFTYPE_MONITOR:
149			continue;
150		case NL80211_IFTYPE_STATION:
151			ieee80211_mgd_quiesce(sdata);
152			break;
153		case NL80211_IFTYPE_WDS:
154			/* tear down aggregation sessions and remove STAs */
155			mutex_lock(&local->sta_mtx);
156			sta = sdata->u.wds.sta;
157			if (sta && sta->uploaded) {
158				enum ieee80211_sta_state state;
159
160				state = sta->sta_state;
161				for (; state > IEEE80211_STA_NOTEXIST; state--)
162					WARN_ON(drv_sta_state(local, sta->sdata,
163							      sta, state,
164							      state - 1));
165			}
166			mutex_unlock(&local->sta_mtx);
167			break;
168		default:
169			break;
170		}
171
172		flush_delayed_work(&sdata->dec_tailroom_needed_wk);
173		drv_remove_interface(local, sdata);
174	}
175
176	/*
177	 * We disconnected on all interfaces before suspend, all channel
178	 * contexts should be released.
179	 */
180	WARN_ON(!list_empty(&local->chanctx_list));
181
182	/* stop hardware - this must stop RX */
183	ieee80211_stop_device(local);
184
185 suspend:
186	local->suspended = true;
187	/* need suspended to be visible before quiescing is false */
188	barrier();
189	local->quiescing = false;
190
191	return 0;
192}
193
194/*
195 * __ieee80211_resume() is a static inline which just calls
196 * ieee80211_reconfig(), which is also needed for hardware
197 * hang/firmware failure/etc. recovery.
198 */
199
200void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
201				    struct cfg80211_wowlan_wakeup *wakeup,
202				    gfp_t gfp)
203{
204	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
205
206	cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
207}
208EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);