drivers/net/wireless/iwlwifi/mvm/time-event.c

   1 /******************************************************************************
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   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
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  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
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  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
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  17  * General Public License for more details.
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  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  62  *****************************************************************************/
  63
  64 #include <linux/jiffies.h>
  65 #include <net/mac80211.h>
  66
  67 #include "iwl-notif-wait.h"
  68 #include "iwl-trans.h"
  69 #include "fw-api.h"
  70 #include "time-event.h"
  71 #include "mvm.h"
  72 #include "iwl-io.h"
  73 #include "iwl-prph.h"
  74
  75 /* A TimeUnit is 1024 microsecond */
  76 #define MSEC_TO_TU(_msec)       (_msec*1000/1024)
  77
  78 /*
  79  * For the high priority TE use a time event type that has similar priority to
  80  * the FW's action scan priority.
  81  */
  82 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  83 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  84
  85 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  86                            struct iwl_mvm_time_event_data *te_data)
  87 {
  88         lockdep_assert_held(&mvm->time_event_lock);
  89
  90         if (te_data->id == TE_MAX)
  91                 return;
  92
  93         list_del(&te_data->list);
  94         te_data->running = false;
  95         te_data->uid = 0;
  96         te_data->id = TE_MAX;
  97         te_data->vif = NULL;
  98 }
  99
 100 void iwl_mvm_roc_done_wk(struct work_struct *wk)
 101 {
 102         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 103
 104         synchronize_net();
 105
 106         /*
 107          * Flush the offchannel queue -- this is called when the time
 108          * event finishes or is cancelled, so that frames queued for it
 109          * won't get stuck on the queue and be transmitted in the next
 110          * time event.
 111          * We have to send the command asynchronously since this cannot
 112          * be under the mutex for locking reasons, but that's not an
 113          * issue as it will have to complete before the next command is
 114          * executed, and a new time event means a new command.
 115          */
 116         iwl_mvm_flush_tx_path(mvm, BIT(IWL_MVM_OFFCHANNEL_QUEUE), false);
 117 }
 118
 119 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 120 {
 121         /*
 122          * First, clear the ROC_RUNNING status bit. This will cause the TX
 123          * path to drop offchannel transmissions. That would also be done
 124          * by mac80211, but it is racy, in particular in the case that the
 125          * time event actually completed in the firmware (which is handled
 126          * in iwl_mvm_te_handle_notif).
 127          */
 128         clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 129
 130         /*
 131          * Of course, our status bit is just as racy as mac80211, so in
 132          * addition, fire off the work struct which will drop all frames
 133          * from the hardware queues that made it through the race. First
 134          * it will of course synchronize the TX path to make sure that
 135          * any *new* TX will be rejected.
 136          */
 137         schedule_work(&mvm->roc_done_wk);
 138 }
 139
 140 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 141                                         struct ieee80211_vif *vif,
 142                                         const char *errmsg)
 143 {
 144         if (vif->type != NL80211_IFTYPE_STATION)
 145                 return false;
 146         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 147                 return false;
 148         if (errmsg)
 149                 IWL_ERR(mvm, "%s\n", errmsg);
 150         ieee80211_connection_loss(vif);
 151         return true;
 152 }
 153
 154 /*
 155  * Handles a FW notification for an event that is known to the driver.
 156  *
 157  * @mvm: the mvm component
 158  * @te_data: the time event data
 159  * @notif: the notification data corresponding the time event data.
 160  */
 161 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 162                                     struct iwl_mvm_time_event_data *te_data,
 163                                     struct iwl_time_event_notif *notif)
 164 {
 165         lockdep_assert_held(&mvm->time_event_lock);
 166
 167         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 168                      le32_to_cpu(notif->unique_id),
 169                      le32_to_cpu(notif->action));
 170
 171         /*
 172          * The FW sends the start/end time event notifications even for events
 173          * that it fails to schedule. This is indicated in the status field of
 174          * the notification. This happens in cases that the scheduler cannot
 175          * find a schedule that can handle the event (for example requesting a
 176          * P2P Device discoveribility, while there are other higher priority
 177          * events in the system).
 178          */
 179         if (!le32_to_cpu(notif->status)) {
 180                 bool start = le32_to_cpu(notif->action) &
 181                                 TE_V2_NOTIF_HOST_EVENT_START;
 182                 IWL_WARN(mvm, "Time Event %s notification failure\n",
 183                          start ? "start" : "end");
 184                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, NULL)) {
 185                         iwl_mvm_te_clear_data(mvm, te_data);
 186                         return;
 187                 }
 188         }
 189
 190         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 191                 IWL_DEBUG_TE(mvm,
 192                              "TE ended - current time %lu, estimated end %lu\n",
 193                              jiffies, te_data->end_jiffies);
 194
 195                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 196                         ieee80211_remain_on_channel_expired(mvm->hw);
 197                         iwl_mvm_roc_finished(mvm);
 198                 }
 199
 200                 /*
 201                  * By now, we should have finished association
 202                  * and know the dtim period.
 203                  */
 204                 iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 205                         "No association and the time event is over already...");
 206                 iwl_mvm_te_clear_data(mvm, te_data);
 207         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 208                 te_data->running = true;
 209                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 210
 211                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 212                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 213                         ieee80211_ready_on_channel(mvm->hw);
 214                 }
 215         } else {
 216                 IWL_WARN(mvm, "Got TE with unknown action\n");
 217         }
 218 }
 219
 220 /*
 221  * The Rx handler for time event notifications
 222  */
 223 int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 224                                 struct iwl_rx_cmd_buffer *rxb,
 225                                 struct iwl_device_cmd *cmd)
 226 {
 227         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 228         struct iwl_time_event_notif *notif = (void *)pkt->data;
 229         struct iwl_mvm_time_event_data *te_data, *tmp;
 230
 231         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 232                      le32_to_cpu(notif->unique_id),
 233                      le32_to_cpu(notif->action));
 234
 235         spin_lock_bh(&mvm->time_event_lock);
 236         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 237                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 238                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 239         }
 240         spin_unlock_bh(&mvm->time_event_lock);
 241
 242         return 0;
 243 }
 244
 245 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 246                                         struct iwl_rx_packet *pkt, void *data)
 247 {
 248         struct iwl_mvm *mvm =
 249                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 250         struct iwl_mvm_time_event_data *te_data = data;
 251         struct iwl_time_event_resp *resp;
 252         int resp_len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
 253
 254         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 255                 return true;
 256
 257         if (WARN_ON_ONCE(resp_len != sizeof(pkt->hdr) + sizeof(*resp))) {
 258                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 259                 return true;
 260         }
 261
 262         resp = (void *)pkt->data;
 263
 264         /* we should never get a response to another TIME_EVENT_CMD here */
 265         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 266                 return false;
 267
 268         te_data->uid = le32_to_cpu(resp->unique_id);
 269         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 270                      te_data->uid);
 271         return true;
 272 }
 273
 274 /* used to convert from time event API v2 to v1 */
 275 #define TE_V2_DEP_POLICY_MSK (TE_V2_DEP_OTHER | TE_V2_DEP_TSF |\
 276                              TE_V2_EVENT_SOCIOPATHIC)
 277 static inline u16 te_v2_get_notify(__le16 policy)
 278 {
 279         return le16_to_cpu(policy) & TE_V2_NOTIF_MSK;
 280 }
 281
 282 static inline u16 te_v2_get_dep_policy(__le16 policy)
 283 {
 284         return (le16_to_cpu(policy) & TE_V2_DEP_POLICY_MSK) >>
 285                 TE_V2_PLACEMENT_POS;
 286 }
 287
 288 static inline u16 te_v2_get_absence(__le16 policy)
 289 {
 290         return (le16_to_cpu(policy) & TE_V2_ABSENCE) >> TE_V2_ABSENCE_POS;
 291 }
 292
 293 static void iwl_mvm_te_v2_to_v1(const struct iwl_time_event_cmd_v2 *cmd_v2,
 294                                 struct iwl_time_event_cmd_v1 *cmd_v1)
 295 {
 296         cmd_v1->id_and_color = cmd_v2->id_and_color;
 297         cmd_v1->action = cmd_v2->action;
 298         cmd_v1->id = cmd_v2->id;
 299         cmd_v1->apply_time = cmd_v2->apply_time;
 300         cmd_v1->max_delay = cmd_v2->max_delay;
 301         cmd_v1->depends_on = cmd_v2->depends_on;
 302         cmd_v1->interval = cmd_v2->interval;
 303         cmd_v1->duration = cmd_v2->duration;
 304         if (cmd_v2->repeat == TE_V2_REPEAT_ENDLESS)
 305                 cmd_v1->repeat = cpu_to_le32(TE_V1_REPEAT_ENDLESS);
 306         else
 307                 cmd_v1->repeat = cpu_to_le32(cmd_v2->repeat);
 308         cmd_v1->max_frags = cpu_to_le32(cmd_v2->max_frags);
 309         cmd_v1->interval_reciprocal = 0; /* unused */
 310
 311         cmd_v1->dep_policy = cpu_to_le32(te_v2_get_dep_policy(cmd_v2->policy));
 312         cmd_v1->is_present = cpu_to_le32(!te_v2_get_absence(cmd_v2->policy));
 313         cmd_v1->notify = cpu_to_le32(te_v2_get_notify(cmd_v2->policy));
 314 }
 315
 316 static int iwl_mvm_send_time_event_cmd(struct iwl_mvm *mvm,
 317                                        const struct iwl_time_event_cmd_v2 *cmd)
 318 {
 319         struct iwl_time_event_cmd_v1 cmd_v1;
 320
 321         if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_TIME_EVENT_API_V2)
 322                 return iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC,
 323                                             sizeof(*cmd), cmd);
 324
 325         iwl_mvm_te_v2_to_v1(cmd, &cmd_v1);
 326         return iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC,
 327                                     sizeof(cmd_v1), &cmd_v1);
 328 }
 329
 330
 331 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 332                                        struct ieee80211_vif *vif,
 333                                        struct iwl_mvm_time_event_data *te_data,
 334                                        struct iwl_time_event_cmd_v2 *te_cmd)
 335 {
 336         static const u8 time_event_response[] = { TIME_EVENT_CMD };
 337         struct iwl_notification_wait wait_time_event;
 338         int ret;
 339
 340         lockdep_assert_held(&mvm->mutex);
 341
 342         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 343                      le32_to_cpu(te_cmd->duration));
 344
 345         spin_lock_bh(&mvm->time_event_lock);
 346         if (WARN_ON(te_data->id != TE_MAX)) {
 347                 spin_unlock_bh(&mvm->time_event_lock);
 348                 return -EIO;
 349         }
 350         te_data->vif = vif;
 351         te_data->duration = le32_to_cpu(te_cmd->duration);
 352         te_data->id = le32_to_cpu(te_cmd->id);
 353         list_add_tail(&te_data->list, &mvm->time_event_list);
 354         spin_unlock_bh(&mvm->time_event_lock);
 355
 356         /*
 357          * Use a notification wait, which really just processes the
 358          * command response and doesn't wait for anything, in order
 359          * to be able to process the response and get the UID inside
 360          * the RX path. Using CMD_WANT_SKB doesn't work because it
 361          * stores the buffer and then wakes up this thread, by which
 362          * time another notification (that the time event started)
 363          * might already be processed unsuccessfully.
 364          */
 365         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 366                                    time_event_response,
 367                                    ARRAY_SIZE(time_event_response),
 368                                    iwl_mvm_time_event_response, te_data);
 369
 370         ret = iwl_mvm_send_time_event_cmd(mvm, te_cmd);
 371         if (ret) {
 372                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 373                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 374                 goto out_clear_te;
 375         }
 376
 377         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 378         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 379         /* should never fail */
 380         WARN_ON_ONCE(ret);
 381
 382         if (ret) {
 383  out_clear_te:
 384                 spin_lock_bh(&mvm->time_event_lock);
 385                 iwl_mvm_te_clear_data(mvm, te_data);
 386                 spin_unlock_bh(&mvm->time_event_lock);
 387         }
 388         return ret;
 389 }
 390
 391 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 392                              struct ieee80211_vif *vif,
 393                              u32 duration, u32 min_duration,
 394                              u32 max_delay)
 395 {
 396         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 397         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 398         struct iwl_time_event_cmd_v2 time_cmd = {};
 399
 400         lockdep_assert_held(&mvm->mutex);
 401
 402         if (te_data->running &&
 403             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 404                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 405                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 406                 return;
 407         }
 408
 409         if (te_data->running) {
 410                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 411                              te_data->uid,
 412                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 413                 /*
 414                  * we don't have enough time
 415                  * cancel the current TE and issue a new one
 416                  * Of course it would be better to remove the old one only
 417                  * when the new one is added, but we don't care if we are off
 418                  * channel for a bit. All we need to do, is not to return
 419                  * before we actually begin to be on the channel.
 420                  */
 421                 iwl_mvm_stop_session_protection(mvm, vif);
 422         }
 423
 424         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 425         time_cmd.id_and_color =
 426                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 427         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 428
 429         time_cmd.apply_time =
 430                 cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG));
 431
 432         time_cmd.max_frags = TE_V2_FRAG_NONE;
 433         time_cmd.max_delay = cpu_to_le32(max_delay);
 434         /* TODO: why do we need to interval = bi if it is not periodic? */
 435         time_cmd.interval = cpu_to_le32(1);
 436         time_cmd.duration = cpu_to_le32(duration);
 437         time_cmd.repeat = 1;
 438         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 439                                       TE_V2_NOTIF_HOST_EVENT_END);
 440
 441         iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 442 }
 443
 444 /*
 445  * Explicit request to remove a time event. The removal of a time event needs to
 446  * be synchronized with the flow of a time event's end notification, which also
 447  * removes the time event from the op mode data structures.
 448  */
 449 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 450                                struct iwl_mvm_vif *mvmvif,
 451                                struct iwl_mvm_time_event_data *te_data)
 452 {
 453         struct iwl_time_event_cmd_v2 time_cmd = {};
 454         u32 id, uid;
 455         int ret;
 456
 457         /*
 458          * It is possible that by the time we got to this point the time
 459          * event was already removed.
 460          */
 461         spin_lock_bh(&mvm->time_event_lock);
 462
 463         /* Save time event uid before clearing its data */
 464         uid = te_data->uid;
 465         id = te_data->id;
 466
 467         /*
 468          * The clear_data function handles time events that were already removed
 469          */
 470         iwl_mvm_te_clear_data(mvm, te_data);
 471         spin_unlock_bh(&mvm->time_event_lock);
 472
 473         /*
 474          * It is possible that by the time we try to remove it, the time event
 475          * has already ended and removed. In such a case there is no need to
 476          * send a removal command.
 477          */
 478         if (id == TE_MAX) {
 479                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid);
 480                 return;
 481         }
 482
 483         /* When we remove a TE, the UID is to be set in the id field */
 484         time_cmd.id = cpu_to_le32(uid);
 485         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 486         time_cmd.id_and_color =
 487                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 488
 489         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 490         ret = iwl_mvm_send_time_event_cmd(mvm, &time_cmd);
 491         if (WARN_ON(ret))
 492                 return;
 493 }
 494
 495 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 496                                      struct ieee80211_vif *vif)
 497 {
 498         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 499         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 500
 501         lockdep_assert_held(&mvm->mutex);
 502         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 503 }
 504
 505 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 506                           int duration, enum ieee80211_roc_type type)
 507 {
 508         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 509         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 510         struct iwl_time_event_cmd_v2 time_cmd = {};
 511
 512         lockdep_assert_held(&mvm->mutex);
 513         if (te_data->running) {
 514                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 515                 return -EBUSY;
 516         }
 517
 518         /*
 519          * Flush the done work, just in case it's still pending, so that
 520          * the work it does can complete and we can accept new frames.
 521          */
 522         flush_work(&mvm->roc_done_wk);
 523
 524         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 525         time_cmd.id_and_color =
 526                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 527
 528         switch (type) {
 529         case IEEE80211_ROC_TYPE_NORMAL:
 530                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 531                 break;
 532         case IEEE80211_ROC_TYPE_MGMT_TX:
 533                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 534                 break;
 535         default:
 536                 WARN_ONCE(1, "Got an invalid ROC type\n");
 537                 return -EINVAL;
 538         }
 539
 540         time_cmd.apply_time = cpu_to_le32(0);
 541         time_cmd.interval = cpu_to_le32(1);
 542
 543         /*
 544          * The P2P Device TEs can have lower priority than other events
 545          * that are being scheduled by the driver/fw, and thus it might not be
 546          * scheduled. To improve the chances of it being scheduled, allow them
 547          * to be fragmented, and in addition allow them to be delayed.
 548          */
 549         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 550         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 551         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 552         time_cmd.repeat = 1;
 553         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 554                                       TE_V2_NOTIF_HOST_EVENT_END);
 555
 556         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 557 }
 558
 559 void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm)
 560 {
 561         struct iwl_mvm_vif *mvmvif;
 562         struct iwl_mvm_time_event_data *te_data;
 563
 564         lockdep_assert_held(&mvm->mutex);
 565
 566         /*
 567          * Iterate over the list of time events and find the time event that is
 568          * associated with a P2P_DEVICE interface.
 569          * This assumes that a P2P_DEVICE interface can have only a single time
 570          * event at any given time and this time event coresponds to a ROC
 571          * request
 572          */
 573         mvmvif = NULL;
 574         spin_lock_bh(&mvm->time_event_lock);
 575         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 576                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 577                         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 578                         break;
 579                 }
 580         }
 581         spin_unlock_bh(&mvm->time_event_lock);
 582
 583         if (!mvmvif) {
 584                 IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n");
 585                 return;
 586         }
 587
 588         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 589
 590         iwl_mvm_roc_finished(mvm);
 591 }