drivers/net/wireless/mwifiex/init.c

   1 /*
   2  * Marvell Wireless LAN device driver: HW/FW Initialization
   3  *
   4  * Copyright (C) 2011, 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
 139         return mwifiex_add_bss_prio_tbl(priv);
 140 }
 141
 142 /*
 143  * This function allocates buffers for members of the adapter
 144  * structure.
 145  *
 146  * The memory allocated includes scan table, command buffers, and
 147  * sleep confirm command buffer. In addition, the queues are
 148  * also initialized.
 149  */
 150 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 151 {
 152         int ret;
 153
 154         /* Allocate command buffer */
 155         ret = mwifiex_alloc_cmd_buffer(adapter);
 156         if (ret) {
 157                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 158                         __func__);
 159                 return -1;
 160         }
 161
 162         adapter->sleep_cfm =
 163                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 164                               + INTF_HEADER_LEN);
 165
 166         if (!adapter->sleep_cfm) {
 167                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 168                         " cmd buffer\n", __func__);
 169                 return -1;
 170         }
 171         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * This function initializes the adapter structure and sets default
 178  * values to the members of adapter.
 179  *
 180  * This also initializes the WMM related parameters in the driver private
 181  * structures.
 182  */
 183 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 184 {
 185         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 186
 187         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 188
 189         adapter->cmd_sent = false;
 190
 191         if (adapter->iface_type == MWIFIEX_SDIO)
 192                 adapter->data_sent = true;
 193         else
 194                 adapter->data_sent = false;
 195
 196         adapter->cmd_resp_received = false;
 197         adapter->event_received = false;
 198         adapter->data_received = false;
 199
 200         adapter->surprise_removed = false;
 201
 202         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 203
 204         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 205         adapter->ps_state = PS_STATE_AWAKE;
 206         adapter->need_to_wakeup = false;
 207
 208         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 209         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 210         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 211         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 212
 213         adapter->scan_probes = 1;
 214
 215         adapter->multiple_dtim = 1;
 216
 217         adapter->local_listen_interval = 0;     /* default value in firmware
 218                                                    will be used */
 219
 220         adapter->is_deep_sleep = false;
 221
 222         adapter->delay_null_pkt = false;
 223         adapter->delay_to_ps = 1000;
 224         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 225
 226         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 227                                            default */
 228         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 229                                            default */
 230         adapter->pm_wakeup_card_req = false;
 231
 232         adapter->pm_wakeup_fw_try = false;
 233
 234         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 235         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 236
 237         adapter->is_hs_configured = false;
 238         adapter->hs_cfg.conditions = cpu_to_le32(HS_CFG_COND_DEF);
 239         adapter->hs_cfg.gpio = HS_CFG_GPIO_DEF;
 240         adapter->hs_cfg.gap = HS_CFG_GAP_DEF;
 241         adapter->hs_activated = false;
 242
 243         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 244         adapter->hw_dot_11n_dev_cap = 0;
 245         adapter->hw_dev_mcs_support = 0;
 246         adapter->sec_chan_offset = 0;
 247         adapter->adhoc_11n_enabled = false;
 248
 249         mwifiex_wmm_init(adapter);
 250
 251         if (adapter->sleep_cfm) {
 252                 sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 253                                                 adapter->sleep_cfm->data;
 254                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 255                 sleep_cfm_buf->command =
 256                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 257                 sleep_cfm_buf->size =
 258                                 cpu_to_le16(adapter->sleep_cfm->len);
 259                 sleep_cfm_buf->result = 0;
 260                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 261                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 262         }
 263         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 264         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 265         adapter->tx_lock_flag = false;
 266         adapter->null_pkt_interval = 0;
 267         adapter->fw_bands = 0;
 268         adapter->config_bands = 0;
 269         adapter->adhoc_start_band = 0;
 270         adapter->scan_channels = NULL;
 271         adapter->fw_release_number = 0;
 272         adapter->fw_cap_info = 0;
 273         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 274         adapter->event_cause = 0;
 275         adapter->region_code = 0;
 276         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 277         adapter->adhoc_awake_period = 0;
 278         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 279         adapter->arp_filter_size = 0;
 280         adapter->max_mgmt_ie_index = MAX_MGMT_IE_INDEX;
 281         adapter->empty_tx_q_cnt = 0;
 282 }
 283
 284 /*
 285  * This function sets trans_start per tx_queue
 286  */
 287 void mwifiex_set_trans_start(struct net_device *dev)
 288 {
 289         int i;
 290
 291         for (i = 0; i < dev->num_tx_queues; i++)
 292                 netdev_get_tx_queue(dev, i)->trans_start = jiffies;
 293
 294         dev->trans_start = jiffies;
 295 }
 296
 297 /*
 298  * This function wakes up all queues in net_device
 299  */
 300 void mwifiex_wake_up_net_dev_queue(struct net_device *netdev,
 301                                         struct mwifiex_adapter *adapter)
 302 {
 303         unsigned long dev_queue_flags;
 304         unsigned int i;
 305
 306         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 307
 308         for (i = 0; i < netdev->num_tx_queues; i++) {
 309                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 310
 311                 if (netif_tx_queue_stopped(txq))
 312                         netif_tx_wake_queue(txq);
 313         }
 314
 315         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 316 }
 317
 318 /*
 319  * This function stops all queues in net_device
 320  */
 321 void mwifiex_stop_net_dev_queue(struct net_device *netdev,
 322                                         struct mwifiex_adapter *adapter)
 323 {
 324         unsigned long dev_queue_flags;
 325         unsigned int i;
 326
 327         spin_lock_irqsave(&adapter->queue_lock, dev_queue_flags);
 328
 329         for (i = 0; i < netdev->num_tx_queues; i++) {
 330                 struct netdev_queue *txq = netdev_get_tx_queue(netdev, i);
 331
 332                 if (!netif_tx_queue_stopped(txq))
 333                         netif_tx_stop_queue(txq);
 334         }
 335
 336         spin_unlock_irqrestore(&adapter->queue_lock, dev_queue_flags);
 337 }
 338
 339 /*
 340  *  This function releases the lock variables and frees the locks and
 341  *  associated locks.
 342  */
 343 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 344 {
 345         struct mwifiex_private *priv;
 346         s32 i, j;
 347
 348         /* Free lists */
 349         list_del(&adapter->cmd_free_q);
 350         list_del(&adapter->cmd_pending_q);
 351         list_del(&adapter->scan_pending_q);
 352
 353         for (i = 0; i < adapter->priv_num; i++)
 354                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 355
 356         for (i = 0; i < adapter->priv_num; i++) {
 357                 if (adapter->priv[i]) {
 358                         priv = adapter->priv[i];
 359                         for (j = 0; j < MAX_NUM_TID; ++j)
 360                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 361                         list_del(&priv->tx_ba_stream_tbl_ptr);
 362                         list_del(&priv->rx_reorder_tbl_ptr);
 363                         list_del(&priv->sta_list);
 364                 }
 365         }
 366 }
 367
 368 /*
 369  * This function performs cleanup for adapter structure.
 370  *
 371  * The cleanup is done recursively, by canceling all pending
 372  * commands, freeing the member buffers previously allocated
 373  * (command buffers, scan table buffer, sleep confirm command
 374  * buffer), stopping the timers and calling the cleanup routines
 375  * for every interface.
 376  */
 377 static void
 378 mwifiex_adapter_cleanup(struct mwifiex_adapter *adapter)
 379 {
 380         int i;
 381
 382         if (!adapter) {
 383                 pr_err("%s: adapter is NULL\n", __func__);
 384                 return;
 385         }
 386
 387         for (i = 0; i < adapter->priv_num; i++) {
 388                 if (adapter->priv[i])
 389                         del_timer_sync(&adapter->priv[i]->scan_delay_timer);
 390         }
 391
 392         mwifiex_cancel_all_pending_cmd(adapter);
 393
 394         /* Free lock variables */
 395         mwifiex_free_lock_list(adapter);
 396
 397         /* Free command buffer */
 398         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 399         mwifiex_free_cmd_buffer(adapter);
 400
 401         del_timer(&adapter->cmd_timer);
 402
 403         dev_dbg(adapter->dev, "info: free scan table\n");
 404
 405         if (adapter->if_ops.cleanup_if)
 406                 adapter->if_ops.cleanup_if(adapter);
 407
 408         if (adapter->sleep_cfm)
 409                 dev_kfree_skb_any(adapter->sleep_cfm);
 410 }
 411
 412 /*
 413  *  This function intializes the lock variables and
 414  *  the list heads.
 415  */
 416 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 417 {
 418         struct mwifiex_private *priv;
 419         s32 i, j;
 420
 421         spin_lock_init(&adapter->mwifiex_lock);
 422         spin_lock_init(&adapter->int_lock);
 423         spin_lock_init(&adapter->main_proc_lock);
 424         spin_lock_init(&adapter->mwifiex_cmd_lock);
 425         spin_lock_init(&adapter->queue_lock);
 426         for (i = 0; i < adapter->priv_num; i++) {
 427                 if (adapter->priv[i]) {
 428                         priv = adapter->priv[i];
 429                         spin_lock_init(&priv->rx_pkt_lock);
 430                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 431                         spin_lock_init(&priv->curr_bcn_buf_lock);
 432                         spin_lock_init(&priv->sta_list_spinlock);
 433                 }
 434         }
 435
 436         /* Initialize cmd_free_q */
 437         INIT_LIST_HEAD(&adapter->cmd_free_q);
 438         /* Initialize cmd_pending_q */
 439         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 440         /* Initialize scan_pending_q */
 441         INIT_LIST_HEAD(&adapter->scan_pending_q);
 442
 443         spin_lock_init(&adapter->cmd_free_q_lock);
 444         spin_lock_init(&adapter->cmd_pending_q_lock);
 445         spin_lock_init(&adapter->scan_pending_q_lock);
 446
 447         skb_queue_head_init(&adapter->usb_rx_data_q);
 448
 449         for (i = 0; i < adapter->priv_num; ++i) {
 450                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 451                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 452         }
 453
 454         for (i = 0; i < adapter->priv_num; i++) {
 455                 if (!adapter->priv[i])
 456                         continue;
 457                 priv = adapter->priv[i];
 458                 for (j = 0; j < MAX_NUM_TID; ++j)
 459                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 460                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 461                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 462                 INIT_LIST_HEAD(&priv->sta_list);
 463
 464                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 465                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 466         }
 467
 468         return 0;
 469 }
 470
 471 /*
 472  * This function initializes the firmware.
 473  *
 474  * The following operations are performed sequentially -
 475  *      - Allocate adapter structure
 476  *      - Initialize the adapter structure
 477  *      - Initialize the private structure
 478  *      - Add BSS priority tables to the adapter structure
 479  *      - For each interface, send the init commands to firmware
 480  *      - Send the first command in command pending queue, if available
 481  */
 482 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 483 {
 484         int ret;
 485         struct mwifiex_private *priv;
 486         u8 i, first_sta = true;
 487         int is_cmd_pend_q_empty;
 488         unsigned long flags;
 489
 490         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 491
 492         /* Allocate memory for member of adapter structure */
 493         ret = mwifiex_allocate_adapter(adapter);
 494         if (ret)
 495                 return -1;
 496
 497         /* Initialize adapter structure */
 498         mwifiex_init_adapter(adapter);
 499
 500         for (i = 0; i < adapter->priv_num; i++) {
 501                 if (adapter->priv[i]) {
 502                         priv = adapter->priv[i];
 503
 504                         /* Initialize private structure */
 505                         ret = mwifiex_init_priv(priv);
 506                         if (ret)
 507                                 return -1;
 508                 }
 509         }
 510
 511         if (adapter->if_ops.init_fw_port) {
 512                 if (adapter->if_ops.init_fw_port(adapter))
 513                         return -1;
 514         }
 515
 516         for (i = 0; i < adapter->priv_num; i++) {
 517                 if (adapter->priv[i]) {
 518                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 519                         if (ret == -1)
 520                                 return -1;
 521
 522                         first_sta = false;
 523                 }
 524         }
 525
 526         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 527         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 528         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 529         if (!is_cmd_pend_q_empty) {
 530                 /* Send the first command in queue and return */
 531                 if (mwifiex_main_process(adapter) != -1)
 532                         ret = -EINPROGRESS;
 533         } else {
 534                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 535         }
 536
 537         return ret;
 538 }
 539
 540 /*
 541  * This function deletes the BSS priority tables.
 542  *
 543  * The function traverses through all the allocated BSS priority nodes
 544  * in every BSS priority table and frees them.
 545  */
 546 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 547 {
 548         int i;
 549         struct mwifiex_adapter *adapter = priv->adapter;
 550         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node;
 551         struct list_head *head;
 552         spinlock_t *lock; /* bss priority lock */
 553         unsigned long flags;
 554
 555         for (i = 0; i < adapter->priv_num; ++i) {
 556                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 557                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 558                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 559                                 " bss_type = %d, bss_num = %d, i = %d,"
 560                                 " head = %p\n",
 561                               priv->bss_type, priv->bss_num, i, head);
 562
 563                 {
 564                         spin_lock_irqsave(lock, flags);
 565                         if (list_empty(head)) {
 566                                 spin_unlock_irqrestore(lock, flags);
 567                                 continue;
 568                         }
 569                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 570                                                  list) {
 571                                 if (bssprio_node->priv == priv) {
 572                                         dev_dbg(adapter->dev, "info: Delete "
 573                                                 "node %p, next = %p\n",
 574                                                 bssprio_node, tmp_node);
 575                                         list_del(&bssprio_node->list);
 576                                         kfree(bssprio_node);
 577                                 }
 578                         }
 579                         spin_unlock_irqrestore(lock, flags);
 580                 }
 581         }
 582 }
 583
 584 /*
 585  * This function frees the private structure, including cleans
 586  * up the TX and RX queues and frees the BSS priority tables.
 587  */
 588 void mwifiex_free_priv(struct mwifiex_private *priv)
 589 {
 590         mwifiex_clean_txrx(priv);
 591         mwifiex_delete_bss_prio_tbl(priv);
 592         mwifiex_free_curr_bcn(priv);
 593 }
 594
 595 /*
 596  * This function is used to shutdown the driver.
 597  *
 598  * The following operations are performed sequentially -
 599  *      - Check if already shut down
 600  *      - Make sure the main process has stopped
 601  *      - Clean up the Tx and Rx queues
 602  *      - Delete BSS priority tables
 603  *      - Free the adapter
 604  *      - Notify completion
 605  */
 606 int
 607 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 608 {
 609         int ret = -EINPROGRESS;
 610         struct mwifiex_private *priv;
 611         s32 i;
 612         struct sk_buff *skb;
 613
 614         /* mwifiex already shutdown */
 615         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 616                 return 0;
 617
 618         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 619         /* wait for mwifiex_process to complete */
 620         if (adapter->mwifiex_processing) {
 621                 dev_warn(adapter->dev, "main process is still running\n");
 622                 return ret;
 623         }
 624
 625         /* cancel current command */
 626         if (adapter->curr_cmd) {
 627                 dev_warn(adapter->dev, "curr_cmd is still in processing\n");
 628                 del_timer(&adapter->cmd_timer);
 629                 mwifiex_recycle_cmd_node(adapter, adapter->curr_cmd);
 630                 adapter->curr_cmd = NULL;
 631         }
 632
 633         /* shut down mwifiex */
 634         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 635
 636         /* Clean up Tx/Rx queues and delete BSS priority table */
 637         for (i = 0; i < adapter->priv_num; i++) {
 638                 if (adapter->priv[i]) {
 639                         priv = adapter->priv[i];
 640
 641                         mwifiex_clean_txrx(priv);
 642                         mwifiex_delete_bss_prio_tbl(priv);
 643                 }
 644         }
 645
 646         spin_lock(&adapter->mwifiex_lock);
 647
 648         if (adapter->if_ops.data_complete) {
 649                 while ((skb = skb_dequeue(&adapter->usb_rx_data_q))) {
 650                         struct mwifiex_rxinfo *rx_info = MWIFIEX_SKB_RXCB(skb);
 651
 652                         priv = adapter->priv[rx_info->bss_num];
 653                         if (priv)
 654                                 priv->stats.rx_dropped++;
 655
 656                         adapter->if_ops.data_complete(adapter, skb);
 657                 }
 658         }
 659
 660         mwifiex_adapter_cleanup(adapter);
 661
 662         spin_unlock(&adapter->mwifiex_lock);
 663
 664         /* Notify completion */
 665         ret = mwifiex_shutdown_fw_complete(adapter);
 666
 667         return ret;
 668 }
 669
 670 /*
 671  * This function downloads the firmware to the card.
 672  *
 673  * The actual download is preceded by two sanity checks -
 674  *      - Check if firmware is already running
 675  *      - Check if the interface is the winner to download the firmware
 676  *
 677  * ...and followed by another -
 678  *      - Check if the firmware is downloaded successfully
 679  *
 680  * After download is successfully completed, the host interrupts are enabled.
 681  */
 682 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 683                     struct mwifiex_fw_image *pmfw)
 684 {
 685         int ret;
 686         u32 poll_num = 1;
 687
 688         if (adapter->if_ops.check_fw_status) {
 689                 adapter->winner = 0;
 690
 691                 /* check if firmware is already running */
 692                 ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 693                 if (!ret) {
 694                         dev_notice(adapter->dev,
 695                                    "WLAN FW already running! Skip FW dnld\n");
 696                         return 0;
 697                 }
 698
 699                 poll_num = MAX_FIRMWARE_POLL_TRIES;
 700
 701                 /* check if we are the winner for downloading FW */
 702                 if (!adapter->winner) {
 703                         dev_notice(adapter->dev,
 704                                    "FW already running! Skip FW dnld\n");
 705                         poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 706                         goto poll_fw;
 707                 }
 708         }
 709
 710         if (pmfw) {
 711                 /* Download firmware with helper */
 712                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 713                 if (ret) {
 714                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 715                         return ret;
 716                 }
 717         }
 718
 719 poll_fw:
 720         /* Check if the firmware is downloaded successfully or not */
 721         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 722         if (ret)
 723                 dev_err(adapter->dev, "FW failed to be active in time\n");
 724
 725         return ret;
 726 }