drivers/net/wireless/ath/ath9k/virtual.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include "ath9k.h"
  18
  19 struct ath9k_vif_iter_data {
  20         int count;
  21         u8 *addr;
  22 };
  23
  24 static void ath9k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
  25 {
  26         struct ath9k_vif_iter_data *iter_data = data;
  27         u8 *nbuf;
  28
  29         nbuf = krealloc(iter_data->addr, (iter_data->count + 1) * ETH_ALEN,
  30                         GFP_ATOMIC);
  31         if (nbuf == NULL)
  32                 return;
  33
  34         memcpy(nbuf + iter_data->count * ETH_ALEN, mac, ETH_ALEN);
  35         iter_data->addr = nbuf;
  36         iter_data->count++;
  37 }
  38
  39 void ath9k_set_bssid_mask(struct ieee80211_hw *hw)
  40 {
  41         struct ath_wiphy *aphy = hw->priv;
  42         struct ath_softc *sc = aphy->sc;
  43         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
  44         struct ath9k_vif_iter_data iter_data;
  45         int i, j;
  46         u8 mask[ETH_ALEN];
  47
  48         /*
  49          * Add primary MAC address even if it is not in active use since it
  50          * will be configured to the hardware as the starting point and the
  51          * BSSID mask will need to be changed if another address is active.
  52          */
  53         iter_data.addr = kmalloc(ETH_ALEN, GFP_ATOMIC);
  54         if (iter_data.addr) {
  55                 memcpy(iter_data.addr, common->macaddr, ETH_ALEN);
  56                 iter_data.count = 1;
  57         } else
  58                 iter_data.count = 0;
  59
  60         /* Get list of all active MAC addresses */
  61         spin_lock_bh(&sc->wiphy_lock);
  62         ieee80211_iterate_active_interfaces_atomic(sc->hw, ath9k_vif_iter,
  63                                                    &iter_data);
  64         for (i = 0; i < sc->num_sec_wiphy; i++) {
  65                 if (sc->sec_wiphy[i] == NULL)
  66                         continue;
  67                 ieee80211_iterate_active_interfaces_atomic(
  68                         sc->sec_wiphy[i]->hw, ath9k_vif_iter, &iter_data);
  69         }
  70         spin_unlock_bh(&sc->wiphy_lock);
  71
  72         /* Generate an address mask to cover all active addresses */
  73         memset(mask, 0, ETH_ALEN);
  74         for (i = 0; i < iter_data.count; i++) {
  75                 u8 *a1 = iter_data.addr + i * ETH_ALEN;
  76                 for (j = i + 1; j < iter_data.count; j++) {
  77                         u8 *a2 = iter_data.addr + j * ETH_ALEN;
  78                         mask[0] |= a1[0] ^ a2[0];
  79                         mask[1] |= a1[1] ^ a2[1];
  80                         mask[2] |= a1[2] ^ a2[2];
  81                         mask[3] |= a1[3] ^ a2[3];
  82                         mask[4] |= a1[4] ^ a2[4];
  83                         mask[5] |= a1[5] ^ a2[5];
  84                 }
  85         }
  86
  87         kfree(iter_data.addr);
  88
  89         /* Invert the mask and configure hardware */
  90         common->bssidmask[0] = ~mask[0];
  91         common->bssidmask[1] = ~mask[1];
  92         common->bssidmask[2] = ~mask[2];
  93         common->bssidmask[3] = ~mask[3];
  94         common->bssidmask[4] = ~mask[4];
  95         common->bssidmask[5] = ~mask[5];
  96
  97         ath_hw_setbssidmask(common);
  98 }
  99
 100 int ath9k_wiphy_add(struct ath_softc *sc)
 101 {
 102         int i, error;
 103         struct ath_wiphy *aphy;
 104         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 105         struct ieee80211_hw *hw;
 106         u8 addr[ETH_ALEN];
 107
 108         hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy), &ath9k_ops);
 109         if (hw == NULL)
 110                 return -ENOMEM;
 111
 112         spin_lock_bh(&sc->wiphy_lock);
 113         for (i = 0; i < sc->num_sec_wiphy; i++) {
 114                 if (sc->sec_wiphy[i] == NULL)
 115                         break;
 116         }
 117
 118         if (i == sc->num_sec_wiphy) {
 119                 /* No empty slot available; increase array length */
 120                 struct ath_wiphy **n;
 121                 n = krealloc(sc->sec_wiphy,
 122                              (sc->num_sec_wiphy + 1) *
 123                              sizeof(struct ath_wiphy *),
 124                              GFP_ATOMIC);
 125                 if (n == NULL) {
 126                         spin_unlock_bh(&sc->wiphy_lock);
 127                         ieee80211_free_hw(hw);
 128                         return -ENOMEM;
 129                 }
 130                 n[i] = NULL;
 131                 sc->sec_wiphy = n;
 132                 sc->num_sec_wiphy++;
 133         }
 134
 135         SET_IEEE80211_DEV(hw, sc->dev);
 136
 137         aphy = hw->priv;
 138         aphy->sc = sc;
 139         aphy->hw = hw;
 140         sc->sec_wiphy[i] = aphy;
 141         spin_unlock_bh(&sc->wiphy_lock);
 142
 143         memcpy(addr, common->macaddr, ETH_ALEN);
 144         addr[0] |= 0x02; /* Locally managed address */
 145         /*
 146          * XOR virtual wiphy index into the least significant bits to generate
 147          * a different MAC address for each virtual wiphy.
 148          */
 149         addr[5] ^= i & 0xff;
 150         addr[4] ^= (i & 0xff00) >> 8;
 151         addr[3] ^= (i & 0xff0000) >> 16;
 152
 153         SET_IEEE80211_PERM_ADDR(hw, addr);
 154
 155         ath_set_hw_capab(sc, hw);
 156
 157         error = ieee80211_register_hw(hw);
 158
 159         if (error == 0) {
 160                 /* Make sure wiphy scheduler is started (if enabled) */
 161                 ath9k_wiphy_set_scheduler(sc, sc->wiphy_scheduler_int);
 162         }
 163
 164         return error;
 165 }
 166
 167 int ath9k_wiphy_del(struct ath_wiphy *aphy)
 168 {
 169         struct ath_softc *sc = aphy->sc;
 170         int i;
 171
 172         spin_lock_bh(&sc->wiphy_lock);
 173         for (i = 0; i < sc->num_sec_wiphy; i++) {
 174                 if (aphy == sc->sec_wiphy[i]) {
 175                         sc->sec_wiphy[i] = NULL;
 176                         spin_unlock_bh(&sc->wiphy_lock);
 177                         ieee80211_unregister_hw(aphy->hw);
 178                         ieee80211_free_hw(aphy->hw);
 179                         return 0;
 180                 }
 181         }
 182         spin_unlock_bh(&sc->wiphy_lock);
 183         return -ENOENT;
 184 }
 185
 186 static int ath9k_send_nullfunc(struct ath_wiphy *aphy,
 187                                struct ieee80211_vif *vif, const u8 *bssid,
 188                                int ps)
 189 {
 190         struct ath_softc *sc = aphy->sc;
 191         struct ath_tx_control txctl;
 192         struct sk_buff *skb;
 193         struct ieee80211_hdr *hdr;
 194         __le16 fc;
 195         struct ieee80211_tx_info *info;
 196
 197         skb = dev_alloc_skb(24);
 198         if (skb == NULL)
 199                 return -ENOMEM;
 200         hdr = (struct ieee80211_hdr *) skb_put(skb, 24);
 201         memset(hdr, 0, 24);
 202         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
 203                          IEEE80211_FCTL_TODS);
 204         if (ps)
 205                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
 206         hdr->frame_control = fc;
 207         memcpy(hdr->addr1, bssid, ETH_ALEN);
 208         memcpy(hdr->addr2, aphy->hw->wiphy->perm_addr, ETH_ALEN);
 209         memcpy(hdr->addr3, bssid, ETH_ALEN);
 210
 211         info = IEEE80211_SKB_CB(skb);
 212         memset(info, 0, sizeof(*info));
 213         info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS;
 214         info->control.vif = vif;
 215         info->control.rates[0].idx = 0;
 216         info->control.rates[0].count = 4;
 217         info->control.rates[1].idx = -1;
 218
 219         memset(&txctl, 0, sizeof(struct ath_tx_control));
 220         txctl.txq = &sc->tx.txq[sc->tx.hwq_map[ATH9K_WME_AC_VO]];
 221         txctl.frame_type = ps ? ATH9K_INT_PAUSE : ATH9K_INT_UNPAUSE;
 222
 223         if (ath_tx_start(aphy->hw, skb, &txctl) != 0)
 224                 goto exit;
 225
 226         return 0;
 227 exit:
 228         dev_kfree_skb_any(skb);
 229         return -1;
 230 }
 231
 232 static bool __ath9k_wiphy_pausing(struct ath_softc *sc)
 233 {
 234         int i;
 235         if (sc->pri_wiphy->state == ATH_WIPHY_PAUSING)
 236                 return true;
 237         for (i = 0; i < sc->num_sec_wiphy; i++) {
 238                 if (sc->sec_wiphy[i] &&
 239                     sc->sec_wiphy[i]->state == ATH_WIPHY_PAUSING)
 240                         return true;
 241         }
 242         return false;
 243 }
 244
 245 static bool ath9k_wiphy_pausing(struct ath_softc *sc)
 246 {
 247         bool ret;
 248         spin_lock_bh(&sc->wiphy_lock);
 249         ret = __ath9k_wiphy_pausing(sc);
 250         spin_unlock_bh(&sc->wiphy_lock);
 251         return ret;
 252 }
 253
 254 static bool __ath9k_wiphy_scanning(struct ath_softc *sc)
 255 {
 256         int i;
 257         if (sc->pri_wiphy->state == ATH_WIPHY_SCAN)
 258                 return true;
 259         for (i = 0; i < sc->num_sec_wiphy; i++) {
 260                 if (sc->sec_wiphy[i] &&
 261                     sc->sec_wiphy[i]->state == ATH_WIPHY_SCAN)
 262                         return true;
 263         }
 264         return false;
 265 }
 266
 267 bool ath9k_wiphy_scanning(struct ath_softc *sc)
 268 {
 269         bool ret;
 270         spin_lock_bh(&sc->wiphy_lock);
 271         ret = __ath9k_wiphy_scanning(sc);
 272         spin_unlock_bh(&sc->wiphy_lock);
 273         return ret;
 274 }
 275
 276 static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy);
 277
 278 /* caller must hold wiphy_lock */
 279 static void __ath9k_wiphy_unpause_ch(struct ath_wiphy *aphy)
 280 {
 281         if (aphy == NULL)
 282                 return;
 283         if (aphy->chan_idx != aphy->sc->chan_idx)
 284                 return; /* wiphy not on the selected channel */
 285         __ath9k_wiphy_unpause(aphy);
 286 }
 287
 288 static void ath9k_wiphy_unpause_channel(struct ath_softc *sc)
 289 {
 290         int i;
 291         spin_lock_bh(&sc->wiphy_lock);
 292         __ath9k_wiphy_unpause_ch(sc->pri_wiphy);
 293         for (i = 0; i < sc->num_sec_wiphy; i++)
 294                 __ath9k_wiphy_unpause_ch(sc->sec_wiphy[i]);
 295         spin_unlock_bh(&sc->wiphy_lock);
 296 }
 297
 298 void ath9k_wiphy_chan_work(struct work_struct *work)
 299 {
 300         struct ath_softc *sc = container_of(work, struct ath_softc, chan_work);
 301         struct ath_wiphy *aphy = sc->next_wiphy;
 302
 303         if (aphy == NULL)
 304                 return;
 305
 306         /*
 307          * All pending interfaces paused; ready to change
 308          * channels.
 309          */
 310
 311         /* Change channels */
 312         mutex_lock(&sc->mutex);
 313         /* XXX: remove me eventually */
 314         ath9k_update_ichannel(sc, aphy->hw,
 315                               &sc->sc_ah->channels[sc->chan_idx]);
 316         ath_update_chainmask(sc, sc->chan_is_ht);
 317         if (ath_set_channel(sc, aphy->hw,
 318                             &sc->sc_ah->channels[sc->chan_idx]) < 0) {
 319                 printk(KERN_DEBUG "ath9k: Failed to set channel for new "
 320                        "virtual wiphy\n");
 321                 mutex_unlock(&sc->mutex);
 322                 return;
 323         }
 324         mutex_unlock(&sc->mutex);
 325
 326         ath9k_wiphy_unpause_channel(sc);
 327 }
 328
 329 /*
 330  * ath9k version of ieee80211_tx_status() for TX frames that are generated
 331  * internally in the driver.
 332  */
 333 void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 334 {
 335         struct ath_wiphy *aphy = hw->priv;
 336         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 337         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 338         struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
 339
 340         if (tx_info_priv && tx_info_priv->frame_type == ATH9K_INT_PAUSE &&
 341             aphy->state == ATH_WIPHY_PAUSING) {
 342                 if (!(info->flags & IEEE80211_TX_STAT_ACK)) {
 343                         printk(KERN_DEBUG "ath9k: %s: no ACK for pause "
 344                                "frame\n", wiphy_name(hw->wiphy));
 345                         /*
 346                          * The AP did not reply; ignore this to allow us to
 347                          * continue.
 348                          */
 349                 }
 350                 aphy->state = ATH_WIPHY_PAUSED;
 351                 if (!ath9k_wiphy_pausing(aphy->sc)) {
 352                         /*
 353                          * Drop from tasklet to work to allow mutex for channel
 354                          * change.
 355                          */
 356                         ieee80211_queue_work(aphy->sc->hw,
 357                                    &aphy->sc->chan_work);
 358                 }
 359         }
 360
 361         kfree(tx_info_priv);
 362         tx_info->rate_driver_data[0] = NULL;
 363
 364         dev_kfree_skb(skb);
 365 }
 366
 367 static void ath9k_mark_paused(struct ath_wiphy *aphy)
 368 {
 369         struct ath_softc *sc = aphy->sc;
 370         aphy->state = ATH_WIPHY_PAUSED;
 371         if (!__ath9k_wiphy_pausing(sc))
 372                 ieee80211_queue_work(sc->hw, &sc->chan_work);
 373 }
 374
 375 static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 376 {
 377         struct ath_wiphy *aphy = data;
 378         struct ath_vif *avp = (void *) vif->drv_priv;
 379
 380         switch (vif->type) {
 381         case NL80211_IFTYPE_STATION:
 382                 if (!vif->bss_conf.assoc) {
 383                         ath9k_mark_paused(aphy);
 384                         break;
 385                 }
 386                 /* TODO: could avoid this if already in PS mode */
 387                 if (ath9k_send_nullfunc(aphy, vif, avp->bssid, 1)) {
 388                         printk(KERN_DEBUG "%s: failed to send PS nullfunc\n",
 389                                __func__);
 390                         ath9k_mark_paused(aphy);
 391                 }
 392                 break;
 393         case NL80211_IFTYPE_AP:
 394                 /* Beacon transmission is paused by aphy->state change */
 395                 ath9k_mark_paused(aphy);
 396                 break;
 397         default:
 398                 break;
 399         }
 400 }
 401
 402 /* caller must hold wiphy_lock */
 403 static int __ath9k_wiphy_pause(struct ath_wiphy *aphy)
 404 {
 405         ieee80211_stop_queues(aphy->hw);
 406         aphy->state = ATH_WIPHY_PAUSING;
 407         /*
 408          * TODO: handle PAUSING->PAUSED for the case where there are multiple
 409          * active vifs (now we do it on the first vif getting ready; should be
 410          * on the last)
 411          */
 412         ieee80211_iterate_active_interfaces_atomic(aphy->hw, ath9k_pause_iter,
 413                                                    aphy);
 414         return 0;
 415 }
 416
 417 int ath9k_wiphy_pause(struct ath_wiphy *aphy)
 418 {
 419         int ret;
 420         spin_lock_bh(&aphy->sc->wiphy_lock);
 421         ret = __ath9k_wiphy_pause(aphy);
 422         spin_unlock_bh(&aphy->sc->wiphy_lock);
 423         return ret;
 424 }
 425
 426 static void ath9k_unpause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 427 {
 428         struct ath_wiphy *aphy = data;
 429         struct ath_vif *avp = (void *) vif->drv_priv;
 430
 431         switch (vif->type) {
 432         case NL80211_IFTYPE_STATION:
 433                 if (!vif->bss_conf.assoc)
 434                         break;
 435                 ath9k_send_nullfunc(aphy, vif, avp->bssid, 0);
 436                 break;
 437         case NL80211_IFTYPE_AP:
 438                 /* Beacon transmission is re-enabled by aphy->state change */
 439                 break;
 440         default:
 441                 break;
 442         }
 443 }
 444
 445 /* caller must hold wiphy_lock */
 446 static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy)
 447 {
 448         ieee80211_iterate_active_interfaces_atomic(aphy->hw,
 449                                                    ath9k_unpause_iter, aphy);
 450         aphy->state = ATH_WIPHY_ACTIVE;
 451         ieee80211_wake_queues(aphy->hw);
 452         return 0;
 453 }
 454
 455 int ath9k_wiphy_unpause(struct ath_wiphy *aphy)
 456 {
 457         int ret;
 458         spin_lock_bh(&aphy->sc->wiphy_lock);
 459         ret = __ath9k_wiphy_unpause(aphy);
 460         spin_unlock_bh(&aphy->sc->wiphy_lock);
 461         return ret;
 462 }
 463
 464 static void __ath9k_wiphy_mark_all_paused(struct ath_softc *sc)
 465 {
 466         int i;
 467         if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE)
 468                 sc->pri_wiphy->state = ATH_WIPHY_PAUSED;
 469         for (i = 0; i < sc->num_sec_wiphy; i++) {
 470                 if (sc->sec_wiphy[i] &&
 471                     sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE)
 472                         sc->sec_wiphy[i]->state = ATH_WIPHY_PAUSED;
 473         }
 474 }
 475
 476 /* caller must hold wiphy_lock */
 477 static void __ath9k_wiphy_pause_all(struct ath_softc *sc)
 478 {
 479         int i;
 480         if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
 481                 __ath9k_wiphy_pause(sc->pri_wiphy);
 482         for (i = 0; i < sc->num_sec_wiphy; i++) {
 483                 if (sc->sec_wiphy[i] &&
 484                     sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
 485                         __ath9k_wiphy_pause(sc->sec_wiphy[i]);
 486         }
 487 }
 488
 489 int ath9k_wiphy_select(struct ath_wiphy *aphy)
 490 {
 491         struct ath_softc *sc = aphy->sc;
 492         bool now;
 493
 494         spin_lock_bh(&sc->wiphy_lock);
 495         if (__ath9k_wiphy_scanning(sc)) {
 496                 /*
 497                  * For now, we are using mac80211 sw scan and it expects to
 498                  * have full control over channel changes, so avoid wiphy
 499                  * scheduling during a scan. This could be optimized if the
 500                  * scanning control were moved into the driver.
 501                  */
 502                 spin_unlock_bh(&sc->wiphy_lock);
 503                 return -EBUSY;
 504         }
 505         if (__ath9k_wiphy_pausing(sc)) {
 506                 if (sc->wiphy_select_failures == 0)
 507                         sc->wiphy_select_first_fail = jiffies;
 508                 sc->wiphy_select_failures++;
 509                 if (time_after(jiffies, sc->wiphy_select_first_fail + HZ / 2))
 510                 {
 511                         printk(KERN_DEBUG "ath9k: Previous wiphy select timed "
 512                                "out; disable/enable hw to recover\n");
 513                         __ath9k_wiphy_mark_all_paused(sc);
 514                         /*
 515                          * TODO: this workaround to fix hardware is unlikely to
 516                          * be specific to virtual wiphy changes. It can happen
 517                          * on normal channel change, too, and as such, this
 518                          * should really be made more generic. For example,
 519                          * tricker radio disable/enable on GTT interrupt burst
 520                          * (say, 10 GTT interrupts received without any TX
 521                          * frame being completed)
 522                          */
 523                         spin_unlock_bh(&sc->wiphy_lock);
 524                         ath_radio_disable(sc);
 525                         ath_radio_enable(sc);
 526                         ieee80211_queue_work(aphy->sc->hw,
 527                                    &aphy->sc->chan_work);
 528                         return -EBUSY; /* previous select still in progress */
 529                 }
 530                 spin_unlock_bh(&sc->wiphy_lock);
 531                 return -EBUSY; /* previous select still in progress */
 532         }
 533         sc->wiphy_select_failures = 0;
 534
 535         /* Store the new channel */
 536         sc->chan_idx = aphy->chan_idx;
 537         sc->chan_is_ht = aphy->chan_is_ht;
 538         sc->next_wiphy = aphy;
 539
 540         __ath9k_wiphy_pause_all(sc);
 541         now = !__ath9k_wiphy_pausing(aphy->sc);
 542         spin_unlock_bh(&sc->wiphy_lock);
 543
 544         if (now) {
 545                 /* Ready to request channel change immediately */
 546                 ieee80211_queue_work(aphy->sc->hw, &aphy->sc->chan_work);
 547         }
 548
 549         /*
 550          * wiphys will be unpaused in ath9k_tx_status() once channel has been
 551          * changed if any wiphy needs time to become paused.
 552          */
 553
 554         return 0;
 555 }
 556
 557 bool ath9k_wiphy_started(struct ath_softc *sc)
 558 {
 559         int i;
 560         spin_lock_bh(&sc->wiphy_lock);
 561         if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE) {
 562                 spin_unlock_bh(&sc->wiphy_lock);
 563                 return true;
 564         }
 565         for (i = 0; i < sc->num_sec_wiphy; i++) {
 566                 if (sc->sec_wiphy[i] &&
 567                     sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE) {
 568                         spin_unlock_bh(&sc->wiphy_lock);
 569                         return true;
 570                 }
 571         }
 572         spin_unlock_bh(&sc->wiphy_lock);
 573         return false;
 574 }
 575
 576 static void ath9k_wiphy_pause_chan(struct ath_wiphy *aphy,
 577                                    struct ath_wiphy *selected)
 578 {
 579         if (selected->state == ATH_WIPHY_SCAN) {
 580                 if (aphy == selected)
 581                         return;
 582                 /*
 583                  * Pause all other wiphys for the duration of the scan even if
 584                  * they are on the current channel now.
 585                  */
 586         } else if (aphy->chan_idx == selected->chan_idx)
 587                 return;
 588         aphy->state = ATH_WIPHY_PAUSED;
 589         ieee80211_stop_queues(aphy->hw);
 590 }
 591
 592 void ath9k_wiphy_pause_all_forced(struct ath_softc *sc,
 593                                   struct ath_wiphy *selected)
 594 {
 595         int i;
 596         spin_lock_bh(&sc->wiphy_lock);
 597         if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
 598                 ath9k_wiphy_pause_chan(sc->pri_wiphy, selected);
 599         for (i = 0; i < sc->num_sec_wiphy; i++) {
 600                 if (sc->sec_wiphy[i] &&
 601                     sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
 602                         ath9k_wiphy_pause_chan(sc->sec_wiphy[i], selected);
 603         }
 604         spin_unlock_bh(&sc->wiphy_lock);
 605 }
 606
 607 void ath9k_wiphy_work(struct work_struct *work)
 608 {
 609         struct ath_softc *sc = container_of(work, struct ath_softc,
 610                                             wiphy_work.work);
 611         struct ath_wiphy *aphy = NULL;
 612         bool first = true;
 613
 614         spin_lock_bh(&sc->wiphy_lock);
 615
 616         if (sc->wiphy_scheduler_int == 0) {
 617                 /* wiphy scheduler is disabled */
 618                 spin_unlock_bh(&sc->wiphy_lock);
 619                 return;
 620         }
 621
 622 try_again:
 623         sc->wiphy_scheduler_index++;
 624         while (sc->wiphy_scheduler_index <= sc->num_sec_wiphy) {
 625                 aphy = sc->sec_wiphy[sc->wiphy_scheduler_index - 1];
 626                 if (aphy && aphy->state != ATH_WIPHY_INACTIVE)
 627                         break;
 628
 629                 sc->wiphy_scheduler_index++;
 630                 aphy = NULL;
 631         }
 632         if (aphy == NULL) {
 633                 sc->wiphy_scheduler_index = 0;
 634                 if (sc->pri_wiphy->state == ATH_WIPHY_INACTIVE) {
 635                         if (first) {
 636                                 first = false;
 637                                 goto try_again;
 638                         }
 639                         /* No wiphy is ready to be scheduled */
 640                 } else
 641                         aphy = sc->pri_wiphy;
 642         }
 643
 644         spin_unlock_bh(&sc->wiphy_lock);
 645
 646         if (aphy &&
 647             aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN &&
 648             ath9k_wiphy_select(aphy)) {
 649                 printk(KERN_DEBUG "ath9k: Failed to schedule virtual wiphy "
 650                        "change\n");
 651         }
 652
 653         ieee80211_queue_delayed_work(sc->hw,
 654                                      &sc->wiphy_work,
 655                                      sc->wiphy_scheduler_int);
 656 }
 657
 658 void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int)
 659 {
 660         cancel_delayed_work_sync(&sc->wiphy_work);
 661         sc->wiphy_scheduler_int = msecs_to_jiffies(msec_int);
 662         if (sc->wiphy_scheduler_int)
 663                 ieee80211_queue_delayed_work(sc->hw, &sc->wiphy_work,
 664                                              sc->wiphy_scheduler_int);
 665 }
 666
 667 /* caller must hold wiphy_lock */
 668 bool ath9k_all_wiphys_idle(struct ath_softc *sc)
 669 {
 670         unsigned int i;
 671         if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE) {
 672                 return false;
 673         }
 674         for (i = 0; i < sc->num_sec_wiphy; i++) {
 675                 struct ath_wiphy *aphy = sc->sec_wiphy[i];
 676                 if (!aphy)
 677                         continue;
 678                 if (aphy->state != ATH_WIPHY_INACTIVE)
 679                         return false;
 680         }
 681         return true;
 682 }