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_common *common = ath9k_hw_common(sc->sc_ah);
 302         struct ath_wiphy *aphy = sc->next_wiphy;
 303
 304         if (aphy == NULL)
 305                 return;
 306
 307         /*
 308          * All pending interfaces paused; ready to change
 309          * channels.
 310          */
 311
 312         /* Change channels */
 313         mutex_lock(&sc->mutex);
 314         /* XXX: remove me eventually */
 315         ath9k_update_ichannel(sc, aphy->hw,
 316                               &sc->sc_ah->channels[sc->chan_idx]);
 317
 318         /* sync hw configuration for hw code */
 319         common->hw = aphy->hw;
 320
 321         ath_update_chainmask(sc, sc->chan_is_ht);
 322         if (ath_set_channel(sc, aphy->hw,
 323                             &sc->sc_ah->channels[sc->chan_idx]) < 0) {
 324                 printk(KERN_DEBUG "ath9k: Failed to set channel for new "
 325                        "virtual wiphy\n");
 326                 mutex_unlock(&sc->mutex);
 327                 return;
 328         }
 329         mutex_unlock(&sc->mutex);
 330
 331         ath9k_wiphy_unpause_channel(sc);
 332 }
 333
 334 /*
 335  * ath9k version of ieee80211_tx_status() for TX frames that are generated
 336  * internally in the driver.
 337  */
 338 void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
 339 {
 340         struct ath_wiphy *aphy = hw->priv;
 341         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 342         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 343         struct ath_tx_info_priv *tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
 344
 345         if (tx_info_priv && tx_info_priv->frame_type == ATH9K_INT_PAUSE &&
 346             aphy->state == ATH_WIPHY_PAUSING) {
 347                 if (!(info->flags & IEEE80211_TX_STAT_ACK)) {
 348                         printk(KERN_DEBUG "ath9k: %s: no ACK for pause "
 349                                "frame\n", wiphy_name(hw->wiphy));
 350                         /*
 351                          * The AP did not reply; ignore this to allow us to
 352                          * continue.
 353                          */
 354                 }
 355                 aphy->state = ATH_WIPHY_PAUSED;
 356                 if (!ath9k_wiphy_pausing(aphy->sc)) {
 357                         /*
 358                          * Drop from tasklet to work to allow mutex for channel
 359                          * change.
 360                          */
 361                         ieee80211_queue_work(aphy->sc->hw,
 362                                    &aphy->sc->chan_work);
 363                 }
 364         }
 365
 366         kfree(tx_info_priv);
 367         tx_info->rate_driver_data[0] = NULL;
 368
 369         dev_kfree_skb(skb);
 370 }
 371
 372 static void ath9k_mark_paused(struct ath_wiphy *aphy)
 373 {
 374         struct ath_softc *sc = aphy->sc;
 375         aphy->state = ATH_WIPHY_PAUSED;
 376         if (!__ath9k_wiphy_pausing(sc))
 377                 ieee80211_queue_work(sc->hw, &sc->chan_work);
 378 }
 379
 380 static void ath9k_pause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 381 {
 382         struct ath_wiphy *aphy = data;
 383         struct ath_vif *avp = (void *) vif->drv_priv;
 384
 385         switch (vif->type) {
 386         case NL80211_IFTYPE_STATION:
 387                 if (!vif->bss_conf.assoc) {
 388                         ath9k_mark_paused(aphy);
 389                         break;
 390                 }
 391                 /* TODO: could avoid this if already in PS mode */
 392                 if (ath9k_send_nullfunc(aphy, vif, avp->bssid, 1)) {
 393                         printk(KERN_DEBUG "%s: failed to send PS nullfunc\n",
 394                                __func__);
 395                         ath9k_mark_paused(aphy);
 396                 }
 397                 break;
 398         case NL80211_IFTYPE_AP:
 399                 /* Beacon transmission is paused by aphy->state change */
 400                 ath9k_mark_paused(aphy);
 401                 break;
 402         default:
 403                 break;
 404         }
 405 }
 406
 407 /* caller must hold wiphy_lock */
 408 static int __ath9k_wiphy_pause(struct ath_wiphy *aphy)
 409 {
 410         ieee80211_stop_queues(aphy->hw);
 411         aphy->state = ATH_WIPHY_PAUSING;
 412         /*
 413          * TODO: handle PAUSING->PAUSED for the case where there are multiple
 414          * active vifs (now we do it on the first vif getting ready; should be
 415          * on the last)
 416          */
 417         ieee80211_iterate_active_interfaces_atomic(aphy->hw, ath9k_pause_iter,
 418                                                    aphy);
 419         return 0;
 420 }
 421
 422 int ath9k_wiphy_pause(struct ath_wiphy *aphy)
 423 {
 424         int ret;
 425         spin_lock_bh(&aphy->sc->wiphy_lock);
 426         ret = __ath9k_wiphy_pause(aphy);
 427         spin_unlock_bh(&aphy->sc->wiphy_lock);
 428         return ret;
 429 }
 430
 431 static void ath9k_unpause_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
 432 {
 433         struct ath_wiphy *aphy = data;
 434         struct ath_vif *avp = (void *) vif->drv_priv;
 435
 436         switch (vif->type) {
 437         case NL80211_IFTYPE_STATION:
 438                 if (!vif->bss_conf.assoc)
 439                         break;
 440                 ath9k_send_nullfunc(aphy, vif, avp->bssid, 0);
 441                 break;
 442         case NL80211_IFTYPE_AP:
 443                 /* Beacon transmission is re-enabled by aphy->state change */
 444                 break;
 445         default:
 446                 break;
 447         }
 448 }
 449
 450 /* caller must hold wiphy_lock */
 451 static int __ath9k_wiphy_unpause(struct ath_wiphy *aphy)
 452 {
 453         ieee80211_iterate_active_interfaces_atomic(aphy->hw,
 454                                                    ath9k_unpause_iter, aphy);
 455         aphy->state = ATH_WIPHY_ACTIVE;
 456         ieee80211_wake_queues(aphy->hw);
 457         return 0;
 458 }
 459
 460 int ath9k_wiphy_unpause(struct ath_wiphy *aphy)
 461 {
 462         int ret;
 463         spin_lock_bh(&aphy->sc->wiphy_lock);
 464         ret = __ath9k_wiphy_unpause(aphy);
 465         spin_unlock_bh(&aphy->sc->wiphy_lock);
 466         return ret;
 467 }
 468
 469 static void __ath9k_wiphy_mark_all_paused(struct ath_softc *sc)
 470 {
 471         int i;
 472         if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE)
 473                 sc->pri_wiphy->state = ATH_WIPHY_PAUSED;
 474         for (i = 0; i < sc->num_sec_wiphy; i++) {
 475                 if (sc->sec_wiphy[i] &&
 476                     sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE)
 477                         sc->sec_wiphy[i]->state = ATH_WIPHY_PAUSED;
 478         }
 479 }
 480
 481 /* caller must hold wiphy_lock */
 482 static void __ath9k_wiphy_pause_all(struct ath_softc *sc)
 483 {
 484         int i;
 485         if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
 486                 __ath9k_wiphy_pause(sc->pri_wiphy);
 487         for (i = 0; i < sc->num_sec_wiphy; i++) {
 488                 if (sc->sec_wiphy[i] &&
 489                     sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
 490                         __ath9k_wiphy_pause(sc->sec_wiphy[i]);
 491         }
 492 }
 493
 494 int ath9k_wiphy_select(struct ath_wiphy *aphy)
 495 {
 496         struct ath_softc *sc = aphy->sc;
 497         bool now;
 498
 499         spin_lock_bh(&sc->wiphy_lock);
 500         if (__ath9k_wiphy_scanning(sc)) {
 501                 /*
 502                  * For now, we are using mac80211 sw scan and it expects to
 503                  * have full control over channel changes, so avoid wiphy
 504                  * scheduling during a scan. This could be optimized if the
 505                  * scanning control were moved into the driver.
 506                  */
 507                 spin_unlock_bh(&sc->wiphy_lock);
 508                 return -EBUSY;
 509         }
 510         if (__ath9k_wiphy_pausing(sc)) {
 511                 if (sc->wiphy_select_failures == 0)
 512                         sc->wiphy_select_first_fail = jiffies;
 513                 sc->wiphy_select_failures++;
 514                 if (time_after(jiffies, sc->wiphy_select_first_fail + HZ / 2))
 515                 {
 516                         printk(KERN_DEBUG "ath9k: Previous wiphy select timed "
 517                                "out; disable/enable hw to recover\n");
 518                         __ath9k_wiphy_mark_all_paused(sc);
 519                         /*
 520                          * TODO: this workaround to fix hardware is unlikely to
 521                          * be specific to virtual wiphy changes. It can happen
 522                          * on normal channel change, too, and as such, this
 523                          * should really be made more generic. For example,
 524                          * tricker radio disable/enable on GTT interrupt burst
 525                          * (say, 10 GTT interrupts received without any TX
 526                          * frame being completed)
 527                          */
 528                         spin_unlock_bh(&sc->wiphy_lock);
 529                         ath_radio_disable(sc);
 530                         ath_radio_enable(sc);
 531                         ieee80211_queue_work(aphy->sc->hw,
 532                                    &aphy->sc->chan_work);
 533                         return -EBUSY; /* previous select still in progress */
 534                 }
 535                 spin_unlock_bh(&sc->wiphy_lock);
 536                 return -EBUSY; /* previous select still in progress */
 537         }
 538         sc->wiphy_select_failures = 0;
 539
 540         /* Store the new channel */
 541         sc->chan_idx = aphy->chan_idx;
 542         sc->chan_is_ht = aphy->chan_is_ht;
 543         sc->next_wiphy = aphy;
 544
 545         __ath9k_wiphy_pause_all(sc);
 546         now = !__ath9k_wiphy_pausing(aphy->sc);
 547         spin_unlock_bh(&sc->wiphy_lock);
 548
 549         if (now) {
 550                 /* Ready to request channel change immediately */
 551                 ieee80211_queue_work(aphy->sc->hw, &aphy->sc->chan_work);
 552         }
 553
 554         /*
 555          * wiphys will be unpaused in ath9k_tx_status() once channel has been
 556          * changed if any wiphy needs time to become paused.
 557          */
 558
 559         return 0;
 560 }
 561
 562 bool ath9k_wiphy_started(struct ath_softc *sc)
 563 {
 564         int i;
 565         spin_lock_bh(&sc->wiphy_lock);
 566         if (sc->pri_wiphy->state != ATH_WIPHY_INACTIVE) {
 567                 spin_unlock_bh(&sc->wiphy_lock);
 568                 return true;
 569         }
 570         for (i = 0; i < sc->num_sec_wiphy; i++) {
 571                 if (sc->sec_wiphy[i] &&
 572                     sc->sec_wiphy[i]->state != ATH_WIPHY_INACTIVE) {
 573                         spin_unlock_bh(&sc->wiphy_lock);
 574                         return true;
 575                 }
 576         }
 577         spin_unlock_bh(&sc->wiphy_lock);
 578         return false;
 579 }
 580
 581 static void ath9k_wiphy_pause_chan(struct ath_wiphy *aphy,
 582                                    struct ath_wiphy *selected)
 583 {
 584         if (selected->state == ATH_WIPHY_SCAN) {
 585                 if (aphy == selected)
 586                         return;
 587                 /*
 588                  * Pause all other wiphys for the duration of the scan even if
 589                  * they are on the current channel now.
 590                  */
 591         } else if (aphy->chan_idx == selected->chan_idx)
 592                 return;
 593         aphy->state = ATH_WIPHY_PAUSED;
 594         ieee80211_stop_queues(aphy->hw);
 595 }
 596
 597 void ath9k_wiphy_pause_all_forced(struct ath_softc *sc,
 598                                   struct ath_wiphy *selected)
 599 {
 600         int i;
 601         spin_lock_bh(&sc->wiphy_lock);
 602         if (sc->pri_wiphy->state == ATH_WIPHY_ACTIVE)
 603                 ath9k_wiphy_pause_chan(sc->pri_wiphy, selected);
 604         for (i = 0; i < sc->num_sec_wiphy; i++) {
 605                 if (sc->sec_wiphy[i] &&
 606                     sc->sec_wiphy[i]->state == ATH_WIPHY_ACTIVE)
 607                         ath9k_wiphy_pause_chan(sc->sec_wiphy[i], selected);
 608         }
 609         spin_unlock_bh(&sc->wiphy_lock);
 610 }
 611
 612 void ath9k_wiphy_work(struct work_struct *work)
 613 {
 614         struct ath_softc *sc = container_of(work, struct ath_softc,
 615                                             wiphy_work.work);
 616         struct ath_wiphy *aphy = NULL;
 617         bool first = true;
 618
 619         spin_lock_bh(&sc->wiphy_lock);
 620
 621         if (sc->wiphy_scheduler_int == 0) {
 622                 /* wiphy scheduler is disabled */
 623                 spin_unlock_bh(&sc->wiphy_lock);
 624                 return;
 625         }
 626
 627 try_again:
 628         sc->wiphy_scheduler_index++;
 629         while (sc->wiphy_scheduler_index <= sc->num_sec_wiphy) {
 630                 aphy = sc->sec_wiphy[sc->wiphy_scheduler_index - 1];
 631                 if (aphy && aphy->state != ATH_WIPHY_INACTIVE)
 632                         break;
 633
 634                 sc->wiphy_scheduler_index++;
 635                 aphy = NULL;
 636         }
 637         if (aphy == NULL) {
 638                 sc->wiphy_scheduler_index = 0;
 639                 if (sc->pri_wiphy->state == ATH_WIPHY_INACTIVE) {
 640                         if (first) {
 641                                 first = false;
 642                                 goto try_again;
 643                         }
 644                         /* No wiphy is ready to be scheduled */
 645                 } else
 646                         aphy = sc->pri_wiphy;
 647         }
 648
 649         spin_unlock_bh(&sc->wiphy_lock);
 650
 651         if (aphy &&
 652             aphy->state != ATH_WIPHY_ACTIVE && aphy->state != ATH_WIPHY_SCAN &&
 653             ath9k_wiphy_select(aphy)) {
 654                 printk(KERN_DEBUG "ath9k: Failed to schedule virtual wiphy "
 655                        "change\n");
 656         }
 657
 658         ieee80211_queue_delayed_work(sc->hw,
 659                                      &sc->wiphy_work,
 660                                      sc->wiphy_scheduler_int);
 661 }
 662
 663 void ath9k_wiphy_set_scheduler(struct ath_softc *sc, unsigned int msec_int)
 664 {
 665         cancel_delayed_work_sync(&sc->wiphy_work);
 666         sc->wiphy_scheduler_int = msecs_to_jiffies(msec_int);
 667         if (sc->wiphy_scheduler_int)
 668                 ieee80211_queue_delayed_work(sc->hw, &sc->wiphy_work,
 669                                              sc->wiphy_scheduler_int);
 670 }
 671
 672 /* caller must hold wiphy_lock */
 673 bool ath9k_all_wiphys_idle(struct ath_softc *sc)
 674 {
 675         unsigned int i;
 676         if (!sc->pri_wiphy->idle)
 677                 return false;
 678         for (i = 0; i < sc->num_sec_wiphy; i++) {
 679                 struct ath_wiphy *aphy = sc->sec_wiphy[i];
 680                 if (!aphy)
 681                         continue;
 682                 if (!aphy->idle)
 683                         return false;
 684         }
 685         return true;
 686 }
 687
 688 /* caller must hold wiphy_lock */
 689 void ath9k_set_wiphy_idle(struct ath_wiphy *aphy, bool idle)
 690 {
 691         struct ath_softc *sc = aphy->sc;
 692
 693         aphy->idle = idle;
 694         ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
 695                   "Marking %s as %s\n",
 696                   wiphy_name(aphy->hw->wiphy),
 697                   idle ? "idle" : "not-idle");
 698 }