drivers/net/wireless/mwifiex/init.c

   1 /*
   2  * Marvell Wireless LAN device driver: HW/FW Initialization
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "wmm.h"
  26 #include "11n.h"
  27
  28 /*
  29  * This function adds a BSS priority table to the table list.
  30  *
  31  * The function allocates a new BSS priority table node and adds it to
  32  * the end of BSS priority table list, kept in driver memory.
  33  */
  34 static int mwifiex_add_bss_prio_tbl(struct mwifiex_private *priv)
  35 {
  36         struct mwifiex_adapter *adapter = priv->adapter;
  37         struct mwifiex_bss_prio_node *bss_prio;
  38         struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
  39         unsigned long flags;
  40
  41         bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
  42         if (!bss_prio)
  43                 return -ENOMEM;
  44
  45         bss_prio->priv = priv;
  46         INIT_LIST_HEAD(&bss_prio->list);
  47
  48         spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
  49         list_add_tail(&bss_prio->list, &tbl[priv->bss_priority].bss_prio_head);
  50         spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
  51
  52         return 0;
  53 }
  54
  55 /*
  56  * This function initializes the private structure and sets default
  57  * values to the members.
  58  *
  59  * Additionally, it also initializes all the locks and sets up all the
  60  * lists.
  61  */
  62 int mwifiex_init_priv(struct mwifiex_private *priv)
  63 {
  64         u32 i;
  65
  66         priv->media_connected = false;
  67         memset(priv->curr_addr, 0xff, ETH_ALEN);
  68
  69         priv->pkt_tx_ctrl = 0;
  70         priv->bss_mode = NL80211_IFTYPE_UNSPECIFIED;
  71         priv->data_rate = 0;    /* Initially indicate the rate as auto */
  72         priv->is_data_rate_auto = true;
  73         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
  74         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
  75
  76         priv->sec_info.wep_enabled = 0;
  77         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
  78         priv->sec_info.encryption_mode = 0;
  79         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
  80                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
  81         priv->wep_key_curr_index = 0;
  82         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
  83                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
  84
  85         priv->beacon_period = 100; /* beacon interval */ ;
  86         priv->attempted_bss_desc = NULL;
  87         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
  88         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
  89
  90         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
  91         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
  92         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
  93         priv->assoc_rsp_size = 0;
  94         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
  95         priv->atim_window = 0;
  96         priv->adhoc_state = ADHOC_IDLE;
  97         priv->tx_power_level = 0;
  98         priv->max_tx_power_level = 0;
  99         priv->min_tx_power_level = 0;
 100         priv->tx_rate = 0;
 101         priv->rxpd_htinfo = 0;
 102         priv->rxpd_rate = 0;
 103         priv->rate_bitmap = 0;
 104         priv->data_rssi_last = 0;
 105         priv->data_rssi_avg = 0;
 106         priv->data_nf_avg = 0;
 107         priv->data_nf_last = 0;
 108         priv->bcn_rssi_last = 0;
 109         priv->bcn_rssi_avg = 0;
 110         priv->bcn_nf_avg = 0;
 111         priv->bcn_nf_last = 0;
 112         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 113         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 114         priv->wpa_ie_len = 0;
 115         priv->wpa_is_gtk_set = false;
 116
 117         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 118         priv->assoc_tlv_buf_len = 0;
 119         memset(&priv->wps, 0, sizeof(priv->wps));
 120         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 121         priv->gen_ie_buf_len = 0;
 122         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 123
 124         priv->wmm_required = true;
 125         priv->wmm_enabled = false;
 126         priv->wmm_qosinfo = 0;
 127         priv->curr_bcn_buf = NULL;
 128         priv->curr_bcn_size = 0;
 129         priv->wps_ie = NULL;
 130         priv->wps_ie_len = 0;
 131         priv->ap_11n_enabled = 0;
 132         memset(&priv->roc_cfg, 0, sizeof(priv->roc_cfg));
 133
 134         priv->scan_block = false;
 135
 136         priv->csa_chan = 0;
 137         priv->csa_expire_time = 0;
 138         priv->del_list_idx = 0;
 139         priv->hs2_enabled = false;
 140         priv->check_tdls_tx = false;
 141         memcpy(priv->tos_to_tid_inv, tos_to_tid_inv, MAX_NUM_TID);
 142
 143         return mwifiex_add_bss_prio_tbl(priv);
 144 }
 145
 146 /*
 147  * This function allocates buffers for members of the adapter
 148  * structure.
 149  *
 150  * The memory allocated includes scan table, command buffers, and
 151  * sleep confirm command buffer. In addition, the queues are
 152  * also initialized.
 153  */
 154 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 155 {
 156         int ret;
 157
 158         /* Allocate command buffer */
 159         ret = mwifiex_alloc_cmd_buffer(adapter);
 160         if (ret) {
 161                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 162                         __func__);
 163                 return -1;
 164         }
 165
 166         adapter->sleep_cfm =
 167                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 168                               + INTF_HEADER_LEN);
 169
 170         if (!adapter->sleep_cfm) {
 171                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 172                         " cmd buffer\n", __func__);
 173                 return -1;
 174         }
 175         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 176
 177         return 0;
 178 }
 179
 180 /*
 181  * This function initializes the adapter structure and sets default
 182  * values to the members of adapter.
 183  *
 184  * This also initializes the WMM related parameters in the driver private
 185  * structures.
 186  */
 187 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 188 {
 189         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 190
 191         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 192
 193         adapter->cmd_sent = false;
 194
 195         if (adapter->iface_type == MWIFIEX_SDIO)
 196                 adapter->data_sent = true;
 197         else
 198                 adapter->data_sent = false;
 199
 200         adapter->cmd_resp_received = false;
 201         adapter->event_received = false;
 202         adapter->data_received = false;
 203
 204         adapter->surprise_removed = false;
 205
 206         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 207
 208         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 209         adapter->ps_state = PS_STATE_AWAKE;
 210         adapter->need_to_wakeup = false;
 211
 212         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 213         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 214         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 215         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 216         adapter->scan_chan_gap_time = MWIFIEX_DEF_SCAN_CHAN_GAP_TIME;
 217
 218         adapter->scan_probes = 1;
 219
 220         adapter->multiple_dtim = 1;
 221
 222         adapter->local_listen_interval = 0;     /* default value in firmware
 223                                                    will be used */
 224
 225         adapter->is_deep_sleep = false;
 226
 227         adapter->delay_null_pkt = false;
 228         adapter->delay_to_ps = 1000;
 229         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 230
 231         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 232                                            default */
 233         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 234                                            default */
 235         adapter->pm_wakeup_card_req = false;
 236
 237         adapter->pm_wakeup_fw_try = false;
 238
 239         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 240
 241         adapter->is_hs_configured = false;
 242         adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
 243         adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
 244         adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
 245         adapter->hs_activated = false;
 246
 247         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 248         adapter->hw_dot_11n_dev_cap = 0;
 249         adapter->hw_dev_mcs_support = 0;
 250         adapter->sec_chan_offset = 0;
 251         adapter->adhoc_11n_enabled = false;
 252
 253         mwifiex_wmm_init(adapter);
 254
 255         if (adapter->sleep_cfm) {
 256                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 257                                                 adapter->sleep_cfm->data;
 258                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 259                 sleep_cfm_buf->command =
 260                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 261                 sleep_cfm_buf->size =
 262                                 cpu_to_le16(adapter->sleep_cfm->len);
 263                 sleep_cfm_buf->result = 0;
 264                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 265                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 266         }
 267         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 268         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 269         adapter->tx_lock_flag = false;
 270         adapter->null_pkt_interval = 0;
 271         adapter->fw_bands = 0;
 272         adapter->config_bands = 0;
 273         adapter->adhoc_start_band = 0;
 274         adapter->scan_channels = NULL;
 275         adapter->fw_release_number = 0;
 276         adapter->fw_cap_info = 0;
 277         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 278         adapter->event_cause = 0;
 279         adapter->region_code = 0;
 280         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 281         adapter->adhoc_awake_period = 0;
 282         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 283         adapter->arp_filter_size = 0;
 284         adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
 285         adapter->ext_scan = true;
 286         adapter->key_api_major_ver = 0;
 287         adapter->key_api_minor_ver = 0;
 288 }
 289
 290 /*
 291  * This function sets trans_start per tx_queue
 292  */
 293 void mwifiex_set_trans_start(struct net_device *dev)
 294 {
 295         int i;
 296
 297         for (i = 0; i < dev->num_tx_queues; i++)
 298                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 299
 300         dev->trans_start = jiffies;
 301 }
 302
 303 /*
 304  * This function wakes up all queues in net_device
 305  */
 306 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 307                                         struct mwifiex_adapter *adapter)
 308 {
 309         unsigned long dev_queue_flags;
 310         unsigned int i;
 311
 312         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 313
 314         for (i = 0; i < netdev->num_tx_queues; i++) {
 315                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 316
 317                 if (netif_tx_queue_stopped(txq))
 318                         netif_tx_wake_queue(txq);
 319         }
 320
 321         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 322 }
 323
 324 /*
 325  * This function stops all queues in net_device
 326  */
 327 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 328                                         struct mwifiex_adapter *adapter)
 329 {
 330         unsigned long dev_queue_flags;
 331         unsigned int i;
 332
 333         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 334
 335         for (i = 0; i < netdev->num_tx_queues; i++) {
 336                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 337
 338                 if (!netif_tx_queue_stopped(txq))
 339                         netif_tx_stop_queue(txq);
 340         }
 341
 342         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 343 }
 344
 345 /*
 346  *  This function releases the lock variables and frees the locks and
 347  *  associated locks.
 348  */
 349 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 350 {
 351         struct mwifiex_private *priv;
 352         s32 i, j;
 353
 354         /* Free lists */
 355         list_del(&adapter->cmd_free_q);
 356         list_del(&adapter->cmd_pending_q);
 357         list_del(&adapter->scan_pending_q);
 358
 359         for (i = 0; i < adapter->priv_num; i++)
 360                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 361
 362         for (i = 0; i < adapter->priv_num; i++) {
 363                 if (adapter->priv[i]) {
 364                         priv = adapter->priv[i];
 365                         for (j = 0; j < MAX_NUM_TID; ++j)
 366                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 367                         list_del(&priv->tx_ba_stream_tbl_ptr);
 368                         list_del(&priv->rx_reorder_tbl_ptr);
 369                         list_del(&priv->sta_list);
 370                         list_del(&priv->auto_tdls_list);
 371                 }
 372         }
 373 }
 374
 375 /*
 376  * This function performs cleanup for adapter structure.
 377  *
 378  * The cleanup is done recursively, by canceling all pending
 379  * commands, freeing the member buffers previously allocated
 380  * (command buffers, scan table buffer, sleep confirm command
 381  * buffer), stopping the timers and calling the cleanup routines
 382  * for every interface.
 383  */
 384 static void
 385 mwifiex_adapter_cleanup(struct mwifiex_adapter *adapter)
 386 {
 387         int idx;
 388
 389         if (!adapter) {
 390                 pr_err("%s: adapter is NULL\n", __func__);
 391                 return;
 392         }
 393
 394         mwifiex_cancel_all_pending_cmd(adapter);
 395
 396         /* Free lock variables */
 397         mwifiex_free_lock_list(adapter);
 398
 399         /* Free command buffer */
 400         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 401         mwifiex_free_cmd_buffer(adapter);
 402
 403         for (idx = 0; idx < adapter->num_mem_types; idx++) {
 404                 struct memory_type_mapping *entry =
 405                                 &adapter->mem_type_mapping_tbl[idx];
 406
 407                 if (entry->mem_ptr) {
 408                         vfree(entry->mem_ptr);
 409                         entry->mem_ptr = NULL;
 410                 }
 411                 entry->mem_size = 0;
 412         }
 413
 414         if (adapter->drv_info_dump) {
 415                 vfree(adapter->drv_info_dump);
 416                 adapter->drv_info_size = 0;
 417         }
 418
 419         if (adapter->sleep_cfm)
 420                 dev_kfree_skb_any(adapter->sleep_cfm);
 421 }
 422
 423 /*
 424  *  This function intializes the lock variables and
 425  *  the list heads.
 426  */
 427 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 428 {
 429         struct mwifiex_private *priv;
 430         s32 i, j;
 431
 432         spin_lock_init(&adapter->mwifiex_lock);
 433         spin_lock_init(&adapter->int_lock);
 434         spin_lock_init(&adapter->main_proc_lock);
 435         spin_lock_init(&adapter->mwifiex_cmd_lock);
 436         spin_lock_init(&adapter->queue_lock);
 437         for (i = 0; i < adapter->priv_num; i++) {
 438                 if (adapter->priv[i]) {
 439                         priv = adapter->priv[i];
 440                         spin_lock_init(&priv->rx_pkt_lock);
 441                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 442                         spin_lock_init(&priv->curr_bcn_buf_lock);
 443                         spin_lock_init(&priv->sta_list_spinlock);
 444                         spin_lock_init(&priv->auto_tdls_lock);
 445                 }
 446         }
 447
 448         /* Initialize cmd_free_q */
 449         INIT_LIST_HEAD(&adapter->cmd_free_q);
 450         /* Initialize cmd_pending_q */
 451         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 452         /* Initialize scan_pending_q */
 453         INIT_LIST_HEAD(&adapter->scan_pending_q);
 454
 455         spin_lock_init(&adapter->cmd_free_q_lock);
 456         spin_lock_init(&adapter->cmd_pending_q_lock);
 457         spin_lock_init(&adapter->scan_pending_q_lock);
 458         spin_lock_init(&adapter->rx_proc_lock);
 459
 460         skb_queue_head_init(&adapter->rx_data_q);
 461
 462         for (i = 0; i < adapter->priv_num; ++i) {
 463                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 464                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 465         }
 466
 467         for (i = 0; i < adapter->priv_num; i++) {
 468                 if (!adapter->priv[i])
 469                         continue;
 470                 priv = adapter->priv[i];
 471                 for (j = 0; j < MAX_NUM_TID; ++j)
 472                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 473                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 474                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 475                 INIT_LIST_HEAD(&priv->sta_list);
 476                 INIT_LIST_HEAD(&priv->auto_tdls_list);
 477                 skb_queue_head_init(&priv->tdls_txq);
 478
 479                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 480                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 481
 482                 spin_lock_init(&priv->ack_status_lock);
 483                 idr_init(&priv->ack_status_frames);
 484         }
 485
 486         return 0;
 487 }
 488
 489 /*
 490  * This function initializes the firmware.
 491  *
 492  * The following operations are performed sequentially -
 493  *      - Allocate adapter structure
 494  *      - Initialize the adapter structure
 495  *      - Initialize the private structure
 496  *      - Add BSS priority tables to the adapter structure
 497  *      - For each interface, send the init commands to firmware
 498  *      - Send the first command in command pending queue, if available
 499  */
 500 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 501 {
 502         int ret;
 503         struct mwifiex_private *priv;
 504         u8 i, first_sta = true;
 505         int is_cmd_pend_q_empty;
 506         unsigned long flags;
 507
 508         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 509
 510         /* Allocate memory for member of adapter structure */
 511         ret = mwifiex_allocate_adapter(adapter);
 512         if (ret)
 513                 return -1;
 514
 515         /* Initialize adapter structure */
 516         mwifiex_init_adapter(adapter);
 517
 518         for (i = 0; i < adapter->priv_num; i++) {
 519                 if (adapter->priv[i]) {
 520                         priv = adapter->priv[i];
 521
 522                         /* Initialize private structure */
 523                         ret = mwifiex_init_priv(priv);
 524                         if (ret)
 525                                 return -1;
 526                 }
 527         }
 528
 529         if (adapter->if_ops.init_fw_port) {
 530                 if (adapter->if_ops.init_fw_port(adapter))
 531                         return -1;
 532         }
 533
 534         for (i = 0; i < adapter->priv_num; i++) {
 535                 if (adapter->priv[i]) {
 536                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 537                         if (ret == -1)
 538                                 return -1;
 539
 540                         first_sta = false;
 541                 }
 542         }
 543
 544         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 545         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 546         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 547         if (!is_cmd_pend_q_empty) {
 548                 /* Send the first command in queue and return */
 549                 if (mwifiex_main_process(adapter) != -1)
 550                         ret = -EINPROGRESS;
 551         } else {
 552                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 553         }
 554
 555         return ret;
 556 }
 557
 558 /*
 559  * This function deletes the BSS priority tables.
 560  *
 561  * The function traverses through all the allocated BSS priority nodes
 562  * in every BSS priority table and frees them.
 563  */
 564 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 565 {
 566         int i;
 567         struct mwifiex_adapter *adapter = priv->adapter;
 568         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
 569         struct list_head *head;
 570         spinlock_t *lock; /* bss priority lock */
 571         unsigned long flags;
 572
 573         for (i = 0; i < adapter->priv_num; ++i) {
 574                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 575                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 576                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 577                                 " bss_type = %d, bss_num = %d, i = %d,"
 578                                 " head = %p\n",
 579                               priv->bss_type, priv->bss_num, i, head);
 580
 581                 {
 582                         spin_lock_irqsave(lock, flags);
 583                         if (list_empty(head)) {
 584                                 spin_unlock_irqrestore(lock, flags);
 585                                 continue;
 586                         }
 587                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 588                                                  list) {
 589                                 if (bssprio_node->priv == priv) {
 590                                         dev_dbg(adapter->dev, "info: Delete "
 591                                                 "node %p, next = %p\n",
 592                                                 bssprio_node, tmp_node);
 593                                         list_del(&bssprio_node->list);
 594                                         kfree(bssprio_node);
 595                                 }
 596                         }
 597                         spin_unlock_irqrestore(lock, flags);
 598                 }
 599         }
 600 }
 601
 602 /*
 603  * This function frees the private structure, including cleans
 604  * up the TX and RX queues and frees the BSS priority tables.
 605  */
 606 void mwifiex_free_priv(struct mwifiex_private *priv)
 607 {
 608         mwifiex_clean_txrx(priv);
 609         mwifiex_delete_bss_prio_tbl(priv);
 610         mwifiex_free_curr_bcn(priv);
 611 }
 612
 613 /*
 614  * This function is used to shutdown the driver.
 615  *
 616  * The following operations are performed sequentially -
 617  *      - Check if already shut down
 618  *      - Make sure the main process has stopped
 619  *      - Clean up the Tx and Rx queues
 620  *      - Delete BSS priority tables
 621  *      - Free the adapter
 622  *      - Notify completion
 623  */
 624 int
 625 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 626 {
 627         int ret = -EINPROGRESS;
 628         struct mwifiex_private *priv;
 629         s32 i;
 630         unsigned long flags;
 631         struct sk_buff *skb;
 632
 633         /* mwifiex already shutdown */
 634         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 635                 return 0;
 636
 637         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 638         /* wait for mwifiex_process to complete */
 639         if (adapter->mwifiex_processing) {
 640                 dev_warn(adapter->dev, "main process is still running\n");
 641                 return ret;
 642         }
 643
 644         /* cancel current command */
 645         if (adapter->curr_cmd) {
 646                 dev_warn(adapter->dev, "curr_cmd is still in processing\n");
 647                 del_timer_sync(&adapter->cmd_timer);
 648                 mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
 649                 adapter->curr_cmd = NULL;
 650         }
 651
 652         /* shut down mwifiex */
 653         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 654
 655         /* Clean up Tx/Rx queues and delete BSS priority table */
 656         for (i = 0; i < adapter->priv_num; i++) {
 657                 if (adapter->priv[i]) {
 658                         priv = adapter->priv[i];
 659
 660                         mwifiex_clean_auto_tdls(priv);
 661                         mwifiex_clean_txrx(priv);
 662                         mwifiex_delete_bss_prio_tbl(priv);
 663                 }
 664         }
 665
 666         spin_lock_irqsave(&adapter->rx_proc_lock, flags);
 667
 668         while ((skb = skb_dequeue(&adapter->rx_data_q))) {
 669                 struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 670
 671                 atomic_dec(&adapter->rx_pending);
 672                 priv = adapter->priv[rx_info->bss_num];
 673                 if (priv)
 674                         priv->stats.rx_dropped++;
 675
 676                 dev_kfree_skb_any(skb);
 677         }
 678
 679         spin_unlock_irqrestore(&adapter->rx_proc_lock, flags);
 680
 681         spin_lock(&adapter->mwifiex_lock);
 682
 683         mwifiex_adapter_cleanup(adapter);
 684
 685         spin_unlock(&adapter->mwifiex_lock);
 686
 687         /* Notify completion */
 688         ret = mwifiex_shutdown_fw_complete(adapter);
 689
 690         return ret;
 691 }
 692
 693 /*
 694  * This function downloads the firmware to the card.
 695  *
 696  * The actual download is preceded by two sanity checks -
 697  *      - Check if firmware is already running
 698  *      - Check if the interface is the winner to download the firmware
 699  *
 700  * ...and followed by another -
 701  *      - Check if the firmware is downloaded successfully
 702  *
 703  * After download is successfully completed, the host interrupts are enabled.
 704  */
 705 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 706                     struct mwifiex_fw_image *pmfw)
 707 {
 708         int ret;
 709         u32 poll_num = 1;
 710
 711         if (adapter->if_ops.check_fw_status) {
 712                 adapter->winner = 0;
 713
 714                 /* check if firmware is already running */
 715                 ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 716                 if (!ret) {
 717                         dev_notice(adapter->dev,
 718                                    "WLAN FW already running! Skip FW dnld\n");
 719                         return 0;
 720                 }
 721
 722                 poll_num = MAX_FIRMWARE_POLL_TRIES;
 723
 724                 /* check if we are the winner for downloading FW */
 725                 if (!adapter->winner) {
 726                         dev_notice(adapter->dev,
 727                                    "FW already running! Skip FW dnld\n");
 728                         goto poll_fw;
 729                 }
 730         }
 731
 732         if (pmfw) {
 733                 /* Download firmware with helper */
 734                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 735                 if (ret) {
 736                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 737                         return ret;
 738                 }
 739         }
 740
 741 poll_fw:
 742         /* Check if the firmware is downloaded successfully or not */
 743         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 744         if (ret)
 745                 dev_err(adapter->dev, "FW failed to be active in time\n");
 746
 747         return ret;
 748 }