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         unsigned long flags;
  39
  40         bss_prio = kzalloc(sizeof(struct mwifiex_bss_prio_node), GFP_KERNEL);
  41         if (!bss_prio) {
  42                 dev_err(adapter->dev, "%s: failed to alloc bss_prio\n",
  43                                                 __func__);
  44                 return -ENOMEM;
  45         }
  46
  47         bss_prio->priv = priv;
  48         INIT_LIST_HEAD(&bss_prio->list);
  49         if (!adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur)
  50                 adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
  51                         bss_prio;
  52
  53         spin_lock_irqsave(&adapter->bss_prio_tbl[priv->bss_priority]
  54                         .bss_prio_lock, flags);
  55         list_add_tail(&bss_prio->list,
  56                         &adapter->bss_prio_tbl[priv->bss_priority]
  57                         .bss_prio_head);
  58         spin_unlock_irqrestore(&adapter->bss_prio_tbl[priv->bss_priority]
  59                         .bss_prio_lock, flags);
  60
  61         return 0;
  62 }
  63
  64 /*
  65  * This function initializes the private structure and sets default
  66  * values to the members.
  67  *
  68  * Additionally, it also initializes all the locks and sets up all the
  69  * lists.
  70  */
  71 static int mwifiex_init_priv(struct mwifiex_private *priv)
  72 {
  73         u32 i;
  74
  75         priv->media_connected = false;
  76         memset(priv->curr_addr, 0xff, ETH_ALEN);
  77
  78         priv->pkt_tx_ctrl = 0;
  79         priv->bss_mode = NL80211_IFTYPE_STATION;
  80         priv->data_rate = 0;    /* Initially indicate the rate as auto */
  81         priv->is_data_rate_auto = true;
  82         priv->bcn_avg_factor = DEFAULT_BCN_AVG_FACTOR;
  83         priv->data_avg_factor = DEFAULT_DATA_AVG_FACTOR;
  84
  85         priv->sec_info.wep_status = MWIFIEX_802_11_WEP_DISABLED;
  86         priv->sec_info.authentication_mode = NL80211_AUTHTYPE_OPEN_SYSTEM;
  87         priv->sec_info.encryption_mode = 0;
  88         for (i = 0; i < ARRAY_SIZE(priv->wep_key); i++)
  89                 memset(&priv->wep_key[i], 0, sizeof(struct mwifiex_wep_key));
  90         priv->wep_key_curr_index = 0;
  91         priv->curr_pkt_filter = HostCmd_ACT_MAC_RX_ON | HostCmd_ACT_MAC_TX_ON |
  92                                 HostCmd_ACT_MAC_ETHERNETII_ENABLE;
  93
  94         priv->beacon_period = 100; /* beacon interval */ ;
  95         priv->attempted_bss_desc = NULL;
  96         memset(&priv->curr_bss_params, 0, sizeof(priv->curr_bss_params));
  97         priv->listen_interval = MWIFIEX_DEFAULT_LISTEN_INTERVAL;
  98
  99         memset(&priv->prev_ssid, 0, sizeof(priv->prev_ssid));
 100         memset(&priv->prev_bssid, 0, sizeof(priv->prev_bssid));
 101         memset(&priv->assoc_rsp_buf, 0, sizeof(priv->assoc_rsp_buf));
 102         priv->assoc_rsp_size = 0;
 103         priv->adhoc_channel = DEFAULT_AD_HOC_CHANNEL;
 104         priv->atim_window = 0;
 105         priv->adhoc_state = ADHOC_IDLE;
 106         priv->tx_power_level = 0;
 107         priv->max_tx_power_level = 0;
 108         priv->min_tx_power_level = 0;
 109         priv->tx_rate = 0;
 110         priv->rxpd_htinfo = 0;
 111         priv->rxpd_rate = 0;
 112         priv->rate_bitmap = 0;
 113         priv->data_rssi_last = 0;
 114         priv->data_rssi_avg = 0;
 115         priv->data_nf_avg = 0;
 116         priv->data_nf_last = 0;
 117         priv->bcn_rssi_last = 0;
 118         priv->bcn_rssi_avg = 0;
 119         priv->bcn_nf_avg = 0;
 120         priv->bcn_nf_last = 0;
 121         memset(&priv->wpa_ie, 0, sizeof(priv->wpa_ie));
 122         memset(&priv->aes_key, 0, sizeof(priv->aes_key));
 123         priv->wpa_ie_len = 0;
 124         priv->wpa_is_gtk_set = false;
 125
 126         memset(&priv->assoc_tlv_buf, 0, sizeof(priv->assoc_tlv_buf));
 127         priv->assoc_tlv_buf_len = 0;
 128         memset(&priv->wps, 0, sizeof(priv->wps));
 129         memset(&priv->gen_ie_buf, 0, sizeof(priv->gen_ie_buf));
 130         priv->gen_ie_buf_len = 0;
 131         memset(priv->vs_ie, 0, sizeof(priv->vs_ie));
 132
 133         priv->wmm_required = true;
 134         priv->wmm_enabled = false;
 135         priv->wmm_qosinfo = 0;
 136         priv->curr_bcn_buf = NULL;
 137         priv->curr_bcn_size = 0;
 138
 139         priv->scan_block = false;
 140
 141         return mwifiex_add_bss_prio_tbl(priv);
 142 }
 143
 144 /*
 145  * This function allocates buffers for members of the adapter
 146  * structure.
 147  *
 148  * The memory allocated includes scan table, command buffers, and
 149  * sleep confirm command buffer. In addition, the queues are
 150  * also initialized.
 151  */
 152 static int mwifiex_allocate_adapter(struct mwifiex_adapter *adapter)
 153 {
 154         int ret;
 155         u32 buf_size;
 156         struct mwifiex_bssdescriptor *temp_scan_table;
 157
 158         /* Allocate buffer to store the BSSID list */
 159         buf_size = sizeof(struct mwifiex_bssdescriptor) * IW_MAX_AP;
 160         temp_scan_table = kzalloc(buf_size, GFP_KERNEL);
 161         if (!temp_scan_table) {
 162                 dev_err(adapter->dev, "%s: failed to alloc temp_scan_table\n",
 163                        __func__);
 164                 return -ENOMEM;
 165         }
 166
 167         adapter->scan_table = temp_scan_table;
 168
 169         /* Allocate command buffer */
 170         ret = mwifiex_alloc_cmd_buffer(adapter);
 171         if (ret) {
 172                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 173                        __func__);
 174                 return -1;
 175         }
 176
 177         adapter->sleep_cfm =
 178                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 179                                 + INTF_HEADER_LEN);
 180
 181         if (!adapter->sleep_cfm) {
 182                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 183                         " cmd buffer\n", __func__);
 184                 return -1;
 185         }
 186         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 187
 188         return 0;
 189 }
 190
 191 /*
 192  * This function initializes the adapter structure and sets default
 193  * values to the members of adapter.
 194  *
 195  * This also initializes the WMM related parameters in the driver private
 196  * structures.
 197  */
 198 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 199 {
 200         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 201
 202         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 203         sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 204                                                 (adapter->sleep_cfm->data);
 205
 206         adapter->cmd_sent = false;
 207         adapter->data_sent = true;
 208         adapter->cmd_resp_received = false;
 209         adapter->event_received = false;
 210         adapter->data_received = false;
 211
 212         adapter->surprise_removed = false;
 213
 214         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 215
 216         adapter->ps_mode = MWIFIEX_802_11_POWER_MODE_CAM;
 217         adapter->ps_state = PS_STATE_AWAKE;
 218         adapter->need_to_wakeup = false;
 219
 220         adapter->scan_mode = HostCmd_BSS_MODE_ANY;
 221         adapter->specific_scan_time = MWIFIEX_SPECIFIC_SCAN_CHAN_TIME;
 222         adapter->active_scan_time = MWIFIEX_ACTIVE_SCAN_CHAN_TIME;
 223         adapter->passive_scan_time = MWIFIEX_PASSIVE_SCAN_CHAN_TIME;
 224
 225         adapter->num_in_scan_table = 0;
 226         memset(adapter->scan_table, 0,
 227                (sizeof(struct mwifiex_bssdescriptor) * IW_MAX_AP));
 228         adapter->scan_probes = 1;
 229
 230         memset(adapter->bcn_buf, 0, sizeof(adapter->bcn_buf));
 231         adapter->bcn_buf_end = adapter->bcn_buf;
 232
 233         adapter->multiple_dtim = 1;
 234
 235         adapter->local_listen_interval = 0;     /* default value in firmware
 236                                                    will be used */
 237
 238         adapter->is_deep_sleep = false;
 239
 240         adapter->delay_null_pkt = false;
 241         adapter->delay_to_ps = 1000;
 242         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 243
 244         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 245                                            default */
 246         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 247                                            default */
 248         adapter->pm_wakeup_card_req = false;
 249
 250         adapter->pm_wakeup_fw_try = false;
 251
 252         adapter->max_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 253         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 254         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 255
 256         adapter->is_hs_configured = false;
 257         adapter->hs_cfg.conditions = cpu_to_le32(HOST_SLEEP_CFG_COND_DEF);
 258         adapter->hs_cfg.gpio = HOST_SLEEP_CFG_GPIO_DEF;
 259         adapter->hs_cfg.gap = HOST_SLEEP_CFG_GAP_DEF;
 260         adapter->hs_activated = false;
 261
 262         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 263         adapter->hw_dot_11n_dev_cap = 0;
 264         adapter->hw_dev_mcs_support = 0;
 265         adapter->chan_offset = 0;
 266         adapter->adhoc_11n_enabled = false;
 267
 268         mwifiex_wmm_init(adapter);
 269
 270         if (adapter->sleep_cfm) {
 271                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 272                 sleep_cfm_buf->command =
 273                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 274                 sleep_cfm_buf->size =
 275                                 cpu_to_le16(adapter->sleep_cfm->len);
 276                 sleep_cfm_buf->result = 0;
 277                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 278                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 279         }
 280         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 281         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 282         adapter->tx_lock_flag = false;
 283         adapter->null_pkt_interval = 0;
 284         adapter->fw_bands = 0;
 285         adapter->config_bands = 0;
 286         adapter->adhoc_start_band = 0;
 287         adapter->scan_channels = NULL;
 288         adapter->fw_release_number = 0;
 289         adapter->fw_cap_info = 0;
 290         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 291         adapter->event_cause = 0;
 292         adapter->region_code = 0;
 293         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 294         adapter->adhoc_awake_period = 0;
 295         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 296         adapter->arp_filter_size = 0;
 297 }
 298
 299 /*
 300  * This function frees the adapter structure.
 301  *
 302  * The freeing operation is done recursively, by canceling all
 303  * pending commands, freeing the member buffers previously
 304  * allocated (command buffers, scan table buffer, sleep confirm
 305  * command buffer), stopping the timers and calling the cleanup
 306  * routines for every interface, before the actual adapter
 307  * structure is freed.
 308  */
 309 static void
 310 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 311 {
 312         if (!adapter) {
 313                 pr_err("%s: adapter is NULL\n", __func__);
 314                 return;
 315         }
 316
 317         mwifiex_cancel_all_pending_cmd(adapter);
 318
 319         /* Free lock variables */
 320         mwifiex_free_lock_list(adapter);
 321
 322         /* Free command buffer */
 323         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 324         mwifiex_free_cmd_buffer(adapter);
 325
 326         del_timer(&adapter->cmd_timer);
 327
 328         dev_dbg(adapter->dev, "info: free scan table\n");
 329         kfree(adapter->scan_table);
 330         adapter->scan_table = NULL;
 331
 332         adapter->if_ops.cleanup_if(adapter);
 333
 334         dev_kfree_skb_any(adapter->sleep_cfm);
 335 }
 336
 337 /*
 338  *  This function intializes the lock variables and
 339  *  the list heads.
 340  */
 341 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 342 {
 343         struct mwifiex_private *priv;
 344         s32 i, j;
 345
 346         spin_lock_init(&adapter->mwifiex_lock);
 347         spin_lock_init(&adapter->int_lock);
 348         spin_lock_init(&adapter->main_proc_lock);
 349         spin_lock_init(&adapter->mwifiex_cmd_lock);
 350         for (i = 0; i < adapter->priv_num; i++) {
 351                 if (adapter->priv[i]) {
 352                         priv = adapter->priv[i];
 353                         spin_lock_init(&priv->rx_pkt_lock);
 354                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 355                         spin_lock_init(&priv->curr_bcn_buf_lock);
 356                 }
 357         }
 358
 359         /* Initialize cmd_free_q */
 360         INIT_LIST_HEAD(&adapter->cmd_free_q);
 361         /* Initialize cmd_pending_q */
 362         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 363         /* Initialize scan_pending_q */
 364         INIT_LIST_HEAD(&adapter->scan_pending_q);
 365
 366         spin_lock_init(&adapter->cmd_free_q_lock);
 367         spin_lock_init(&adapter->cmd_pending_q_lock);
 368         spin_lock_init(&adapter->scan_pending_q_lock);
 369
 370         for (i = 0; i < adapter->priv_num; ++i) {
 371                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 372                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 373                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 374         }
 375
 376         for (i = 0; i < adapter->priv_num; i++) {
 377                 if (!adapter->priv[i])
 378                         continue;
 379                 priv = adapter->priv[i];
 380                 for (j = 0; j < MAX_NUM_TID; ++j) {
 381                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 382                         spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
 383                 }
 384                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 385                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 386
 387                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 388                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 389         }
 390
 391         return 0;
 392 }
 393
 394 /*
 395  *  This function releases the lock variables and frees the locks and
 396  *  associated locks.
 397  */
 398 void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 399 {
 400         struct mwifiex_private *priv;
 401         s32 i, j;
 402
 403         /* Free lists */
 404         list_del(&adapter->cmd_free_q);
 405         list_del(&adapter->cmd_pending_q);
 406         list_del(&adapter->scan_pending_q);
 407
 408         for (i = 0; i < adapter->priv_num; i++)
 409                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 410
 411         for (i = 0; i < adapter->priv_num; i++) {
 412                 if (adapter->priv[i]) {
 413                         priv = adapter->priv[i];
 414                         for (j = 0; j < MAX_NUM_TID; ++j)
 415                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 416                         list_del(&priv->tx_ba_stream_tbl_ptr);
 417                         list_del(&priv->rx_reorder_tbl_ptr);
 418                 }
 419         }
 420 }
 421
 422 /*
 423  * This function initializes the firmware.
 424  *
 425  * The following operations are performed sequentially -
 426  *      - Allocate adapter structure
 427  *      - Initialize the adapter structure
 428  *      - Initialize the private structure
 429  *      - Add BSS priority tables to the adapter structure
 430  *      - For each interface, send the init commands to firmware
 431  *      - Send the first command in command pending queue, if available
 432  */
 433 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 434 {
 435         int ret;
 436         struct mwifiex_private *priv;
 437         u8 i, first_sta = true;
 438         int is_cmd_pend_q_empty;
 439         unsigned long flags;
 440
 441         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 442
 443         /* Allocate memory for member of adapter structure */
 444         ret = mwifiex_allocate_adapter(adapter);
 445         if (ret)
 446                 return -1;
 447
 448         /* Initialize adapter structure */
 449         mwifiex_init_adapter(adapter);
 450
 451         for (i = 0; i < adapter->priv_num; i++) {
 452                 if (adapter->priv[i]) {
 453                         priv = adapter->priv[i];
 454
 455                         /* Initialize private structure */
 456                         ret = mwifiex_init_priv(priv);
 457                         if (ret)
 458                                 return -1;
 459                 }
 460         }
 461         for (i = 0; i < adapter->priv_num; i++) {
 462                 if (adapter->priv[i]) {
 463                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 464                         if (ret == -1)
 465                                 return -1;
 466
 467                         first_sta = false;
 468                 }
 469         }
 470
 471         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 472         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 473         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 474         if (!is_cmd_pend_q_empty) {
 475                 /* Send the first command in queue and return */
 476                 if (mwifiex_main_process(adapter) != -1)
 477                         ret = -EINPROGRESS;
 478         } else {
 479                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 480         }
 481
 482         return ret;
 483 }
 484
 485 /*
 486  * This function deletes the BSS priority tables.
 487  *
 488  * The function traverses through all the allocated BSS priority nodes
 489  * in every BSS priority table and frees them.
 490  */
 491 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 492 {
 493         int i;
 494         struct mwifiex_adapter *adapter = priv->adapter;
 495         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 496         struct list_head *head;
 497         spinlock_t *lock;
 498         unsigned long flags;
 499
 500         for (i = 0; i < adapter->priv_num; ++i) {
 501                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 502                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 503                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 504                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 505                                 " index = %d, i = %d, head = %p, cur = %p\n",
 506                               priv->bss_index, i, head, *cur);
 507                 if (*cur) {
 508                         spin_lock_irqsave(lock, flags);
 509                         if (list_empty(head)) {
 510                                 spin_unlock_irqrestore(lock, flags);
 511                                 continue;
 512                         }
 513                         bssprio_node = list_first_entry(head,
 514                                         struct mwifiex_bss_prio_node, list);
 515                         spin_unlock_irqrestore(lock, flags);
 516
 517                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 518                                                  list) {
 519                                 if (bssprio_node->priv == priv) {
 520                                         dev_dbg(adapter->dev, "info: Delete "
 521                                                 "node %p, next = %p\n",
 522                                                 bssprio_node, tmp_node);
 523                                         spin_lock_irqsave(lock, flags);
 524                                         list_del(&bssprio_node->list);
 525                                         spin_unlock_irqrestore(lock, flags);
 526                                         kfree(bssprio_node);
 527                                 }
 528                         }
 529                         *cur = (struct mwifiex_bss_prio_node *)head;
 530                 }
 531         }
 532 }
 533
 534 /*
 535  * This function is used to shutdown the driver.
 536  *
 537  * The following operations are performed sequentially -
 538  *      - Check if already shut down
 539  *      - Make sure the main process has stopped
 540  *      - Clean up the Tx and Rx queues
 541  *      - Delete BSS priority tables
 542  *      - Free the adapter
 543  *      - Notify completion
 544  */
 545 int
 546 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 547 {
 548         int ret = -EINPROGRESS;
 549         struct mwifiex_private *priv;
 550         s32 i;
 551         unsigned long flags;
 552
 553         /* mwifiex already shutdown */
 554         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 555                 return 0;
 556
 557         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 558         /* wait for mwifiex_process to complete */
 559         if (adapter->mwifiex_processing) {
 560                 dev_warn(adapter->dev, "main process is still running\n");
 561                 return ret;
 562         }
 563
 564         /* shut down mwifiex */
 565         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 566
 567         /* Clean up Tx/Rx queues and delete BSS priority table */
 568         for (i = 0; i < adapter->priv_num; i++) {
 569                 if (adapter->priv[i]) {
 570                         priv = adapter->priv[i];
 571
 572                         mwifiex_clean_txrx(priv);
 573                         mwifiex_delete_bss_prio_tbl(priv);
 574                 }
 575         }
 576
 577         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 578
 579         /* Free adapter structure */
 580         mwifiex_free_adapter(adapter);
 581
 582         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 583
 584         /* Notify completion */
 585         ret = mwifiex_shutdown_fw_complete(adapter);
 586
 587         return ret;
 588 }
 589
 590 /*
 591  * This function downloads the firmware to the card.
 592  *
 593  * The actual download is preceded by two sanity checks -
 594  *      - Check if firmware is already running
 595  *      - Check if the interface is the winner to download the firmware
 596  *
 597  * ...and followed by another -
 598  *      - Check if the firmware is downloaded successfully
 599  *
 600  * After download is successfully completed, the host interrupts are enabled.
 601  */
 602 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 603                     struct mwifiex_fw_image *pmfw)
 604 {
 605         int ret, winner;
 606         u32 poll_num = 1;
 607
 608         /* Check if firmware is already running */
 609         ret = adapter->if_ops.check_fw_status(adapter, poll_num, &winner);
 610         if (!ret) {
 611                 dev_notice(adapter->dev,
 612                                 "WLAN FW already running! Skip FW download\n");
 613                 goto done;
 614         }
 615         poll_num = MAX_FIRMWARE_POLL_TRIES;
 616
 617         /* Check if we are the winner for downloading FW */
 618         if (!winner) {
 619                 dev_notice(adapter->dev,
 620                                 "Other interface already running!"
 621                                 " Skip FW download\n");
 622                 poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 623                 goto poll_fw;
 624         }
 625         if (pmfw) {
 626                 /* Download firmware with helper */
 627                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 628                 if (ret) {
 629                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 630                         return ret;
 631                 }
 632         }
 633
 634 poll_fw:
 635         /* Check if the firmware is downloaded successfully or not */
 636         ret = adapter->if_ops.check_fw_status(adapter, poll_num, NULL);
 637         if (ret) {
 638                 dev_err(adapter->dev, "FW failed to be active in time\n");
 639                 return -1;
 640         }
 641 done:
 642         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 643         adapter->if_ops.enable_int(adapter);
 644         return ret;
 645 }