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_UNSPECIFIED;
  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
 156         /* Allocate command buffer */
 157         ret = mwifiex_alloc_cmd_buffer(adapter);
 158         if (ret) {
 159                 dev_err(adapter->dev, "%s: failed to alloc cmd buffer\n",
 160                        __func__);
 161                 return -1;
 162         }
 163
 164         adapter->sleep_cfm =
 165                 dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
 166                                 + INTF_HEADER_LEN);
 167
 168         if (!adapter->sleep_cfm) {
 169                 dev_err(adapter->dev, "%s: failed to alloc sleep cfm"
 170                         " cmd buffer\n", __func__);
 171                 return -1;
 172         }
 173         skb_reserve(adapter->sleep_cfm, INTF_HEADER_LEN);
 174
 175         return 0;
 176 }
 177
 178 /*
 179  * This function initializes the adapter structure and sets default
 180  * values to the members of adapter.
 181  *
 182  * This also initializes the WMM related parameters in the driver private
 183  * structures.
 184  */
 185 static void mwifiex_init_adapter(struct mwifiex_adapter *adapter)
 186 {
 187         struct mwifiex_opt_sleep_confirm *sleep_cfm_buf = NULL;
 188
 189         skb_put(adapter->sleep_cfm, sizeof(struct mwifiex_opt_sleep_confirm));
 190         sleep_cfm_buf = (struct mwifiex_opt_sleep_confirm *)
 191                                                 (adapter->sleep_cfm->data);
 192
 193         adapter->cmd_sent = false;
 194
 195         if (adapter->iface_type == MWIFIEX_PCIE)
 196                 adapter->data_sent = false;
 197         else
 198                 adapter->data_sent = true;
 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
 217         adapter->scan_probes = 1;
 218
 219         adapter->multiple_dtim = 1;
 220
 221         adapter->local_listen_interval = 0;     /* default value in firmware
 222                                                    will be used */
 223
 224         adapter->is_deep_sleep = false;
 225
 226         adapter->delay_null_pkt = false;
 227         adapter->delay_to_ps = 1000;
 228         adapter->enhanced_ps_mode = PS_MODE_AUTO;
 229
 230         adapter->gen_null_pkt = false;  /* Disable NULL Pkg generation by
 231                                            default */
 232         adapter->pps_uapsd_mode = false; /* Disable pps/uapsd mode by
 233                                            default */
 234         adapter->pm_wakeup_card_req = false;
 235
 236         adapter->pm_wakeup_fw_try = false;
 237
 238         adapter->max_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 239         adapter->tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 240         adapter->curr_tx_buf_size = MWIFIEX_TX_DATA_BUF_SIZE_2K;
 241
 242         adapter->is_hs_configured = false;
 243         adapter->hs_cfg.conditions = cpu_to_le32(HOST_SLEEP_CFG_COND_DEF);
 244         adapter->hs_cfg.gpio = HOST_SLEEP_CFG_GPIO_DEF;
 245         adapter->hs_cfg.gap = HOST_SLEEP_CFG_GAP_DEF;
 246         adapter->hs_activated = false;
 247
 248         memset(adapter->event_body, 0, sizeof(adapter->event_body));
 249         adapter->hw_dot_11n_dev_cap = 0;
 250         adapter->hw_dev_mcs_support = 0;
 251         adapter->chan_offset = 0;
 252         adapter->adhoc_11n_enabled = false;
 253
 254         mwifiex_wmm_init(adapter);
 255
 256         if (adapter->sleep_cfm) {
 257                 memset(sleep_cfm_buf, 0, adapter->sleep_cfm->len);
 258                 sleep_cfm_buf->command =
 259                                 cpu_to_le16(HostCmd_CMD_802_11_PS_MODE_ENH);
 260                 sleep_cfm_buf->size =
 261                                 cpu_to_le16(adapter->sleep_cfm->len);
 262                 sleep_cfm_buf->result = 0;
 263                 sleep_cfm_buf->action = cpu_to_le16(SLEEP_CONFIRM);
 264                 sleep_cfm_buf->resp_ctrl = cpu_to_le16(RESP_NEEDED);
 265         }
 266         memset(&adapter->sleep_params, 0, sizeof(adapter->sleep_params));
 267         memset(&adapter->sleep_period, 0, sizeof(adapter->sleep_period));
 268         adapter->tx_lock_flag = false;
 269         adapter->null_pkt_interval = 0;
 270         adapter->fw_bands = 0;
 271         adapter->config_bands = 0;
 272         adapter->adhoc_start_band = 0;
 273         adapter->scan_channels = NULL;
 274         adapter->fw_release_number = 0;
 275         adapter->fw_cap_info = 0;
 276         memset(&adapter->upld_buf, 0, sizeof(adapter->upld_buf));
 277         adapter->event_cause = 0;
 278         adapter->region_code = 0;
 279         adapter->bcn_miss_time_out = DEFAULT_BCN_MISS_TIMEOUT;
 280         adapter->adhoc_awake_period = 0;
 281         memset(&adapter->arp_filter, 0, sizeof(adapter->arp_filter));
 282         adapter->arp_filter_size = 0;
 283 }
 284
 285 /*
 286  *  This function releases the lock variables and frees the locks and
 287  *  associated locks.
 288  */
 289 static void mwifiex_free_lock_list(struct mwifiex_adapter *adapter)
 290 {
 291         struct mwifiex_private *priv;
 292         s32 i, j;
 293
 294         /* Free lists */
 295         list_del(&adapter->cmd_free_q);
 296         list_del(&adapter->cmd_pending_q);
 297         list_del(&adapter->scan_pending_q);
 298
 299         for (i = 0; i < adapter->priv_num; i++)
 300                 list_del(&adapter->bss_prio_tbl[i].bss_prio_head);
 301
 302         for (i = 0; i < adapter->priv_num; i++) {
 303                 if (adapter->priv[i]) {
 304                         priv = adapter->priv[i];
 305                         for (j = 0; j < MAX_NUM_TID; ++j)
 306                                 list_del(&priv->wmm.tid_tbl_ptr[j].ra_list);
 307                         list_del(&priv->tx_ba_stream_tbl_ptr);
 308                         list_del(&priv->rx_reorder_tbl_ptr);
 309                 }
 310         }
 311 }
 312
 313 /*
 314  * This function frees the adapter structure.
 315  *
 316  * The freeing operation is done recursively, by canceling all
 317  * pending commands, freeing the member buffers previously
 318  * allocated (command buffers, scan table buffer, sleep confirm
 319  * command buffer), stopping the timers and calling the cleanup
 320  * routines for every interface, before the actual adapter
 321  * structure is freed.
 322  */
 323 static void
 324 mwifiex_free_adapter(struct mwifiex_adapter *adapter)
 325 {
 326         if (!adapter) {
 327                 pr_err("%s: adapter is NULL\n", __func__);
 328                 return;
 329         }
 330
 331         mwifiex_cancel_all_pending_cmd(adapter);
 332
 333         /* Free lock variables */
 334         mwifiex_free_lock_list(adapter);
 335
 336         /* Free command buffer */
 337         dev_dbg(adapter->dev, "info: free cmd buffer\n");
 338         mwifiex_free_cmd_buffer(adapter);
 339
 340         del_timer(&adapter->cmd_timer);
 341
 342         dev_dbg(adapter->dev, "info: free scan table\n");
 343
 344         adapter->if_ops.cleanup_if(adapter);
 345
 346         dev_kfree_skb_any(adapter->sleep_cfm);
 347 }
 348
 349 /*
 350  *  This function intializes the lock variables and
 351  *  the list heads.
 352  */
 353 int mwifiex_init_lock_list(struct mwifiex_adapter *adapter)
 354 {
 355         struct mwifiex_private *priv;
 356         s32 i, j;
 357
 358         spin_lock_init(&adapter->mwifiex_lock);
 359         spin_lock_init(&adapter->int_lock);
 360         spin_lock_init(&adapter->main_proc_lock);
 361         spin_lock_init(&adapter->mwifiex_cmd_lock);
 362         for (i = 0; i < adapter->priv_num; i++) {
 363                 if (adapter->priv[i]) {
 364                         priv = adapter->priv[i];
 365                         spin_lock_init(&priv->rx_pkt_lock);
 366                         spin_lock_init(&priv->wmm.ra_list_spinlock);
 367                         spin_lock_init(&priv->curr_bcn_buf_lock);
 368                 }
 369         }
 370
 371         /* Initialize cmd_free_q */
 372         INIT_LIST_HEAD(&adapter->cmd_free_q);
 373         /* Initialize cmd_pending_q */
 374         INIT_LIST_HEAD(&adapter->cmd_pending_q);
 375         /* Initialize scan_pending_q */
 376         INIT_LIST_HEAD(&adapter->scan_pending_q);
 377
 378         spin_lock_init(&adapter->cmd_free_q_lock);
 379         spin_lock_init(&adapter->cmd_pending_q_lock);
 380         spin_lock_init(&adapter->scan_pending_q_lock);
 381
 382         for (i = 0; i < adapter->priv_num; ++i) {
 383                 INIT_LIST_HEAD(&adapter->bss_prio_tbl[i].bss_prio_head);
 384                 adapter->bss_prio_tbl[i].bss_prio_cur = NULL;
 385                 spin_lock_init(&adapter->bss_prio_tbl[i].bss_prio_lock);
 386         }
 387
 388         for (i = 0; i < adapter->priv_num; i++) {
 389                 if (!adapter->priv[i])
 390                         continue;
 391                 priv = adapter->priv[i];
 392                 for (j = 0; j < MAX_NUM_TID; ++j) {
 393                         INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[j].ra_list);
 394                         spin_lock_init(&priv->wmm.tid_tbl_ptr[j].tid_tbl_lock);
 395                 }
 396                 INIT_LIST_HEAD(&priv->tx_ba_stream_tbl_ptr);
 397                 INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
 398
 399                 spin_lock_init(&priv->tx_ba_stream_tbl_lock);
 400                 spin_lock_init(&priv->rx_reorder_tbl_lock);
 401         }
 402
 403         return 0;
 404 }
 405
 406 /*
 407  * This function initializes the firmware.
 408  *
 409  * The following operations are performed sequentially -
 410  *      - Allocate adapter structure
 411  *      - Initialize the adapter structure
 412  *      - Initialize the private structure
 413  *      - Add BSS priority tables to the adapter structure
 414  *      - For each interface, send the init commands to firmware
 415  *      - Send the first command in command pending queue, if available
 416  */
 417 int mwifiex_init_fw(struct mwifiex_adapter *adapter)
 418 {
 419         int ret;
 420         struct mwifiex_private *priv;
 421         u8 i, first_sta = true;
 422         int is_cmd_pend_q_empty;
 423         unsigned long flags;
 424
 425         adapter->hw_status = MWIFIEX_HW_STATUS_INITIALIZING;
 426
 427         /* Allocate memory for member of adapter structure */
 428         ret = mwifiex_allocate_adapter(adapter);
 429         if (ret)
 430                 return -1;
 431
 432         /* Initialize adapter structure */
 433         mwifiex_init_adapter(adapter);
 434
 435         for (i = 0; i < adapter->priv_num; i++) {
 436                 if (adapter->priv[i]) {
 437                         priv = adapter->priv[i];
 438
 439                         /* Initialize private structure */
 440                         ret = mwifiex_init_priv(priv);
 441                         if (ret)
 442                                 return -1;
 443                 }
 444         }
 445         for (i = 0; i < adapter->priv_num; i++) {
 446                 if (adapter->priv[i]) {
 447                         ret = mwifiex_sta_init_cmd(adapter->priv[i], first_sta);
 448                         if (ret == -1)
 449                                 return -1;
 450
 451                         first_sta = false;
 452                 }
 453         }
 454
 455         spin_lock_irqsave(&adapter->cmd_pending_q_lock, flags);
 456         is_cmd_pend_q_empty = list_empty(&adapter->cmd_pending_q);
 457         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, flags);
 458         if (!is_cmd_pend_q_empty) {
 459                 /* Send the first command in queue and return */
 460                 if (mwifiex_main_process(adapter) != -1)
 461                         ret = -EINPROGRESS;
 462         } else {
 463                 adapter->hw_status = MWIFIEX_HW_STATUS_READY;
 464         }
 465
 466         return ret;
 467 }
 468
 469 /*
 470  * This function deletes the BSS priority tables.
 471  *
 472  * The function traverses through all the allocated BSS priority nodes
 473  * in every BSS priority table and frees them.
 474  */
 475 static void mwifiex_delete_bss_prio_tbl(struct mwifiex_private *priv)
 476 {
 477         int i;
 478         struct mwifiex_adapter *adapter = priv->adapter;
 479         struct mwifiex_bss_prio_node *bssprio_node, *tmp_node, **cur;
 480         struct list_head *head;
 481         spinlock_t *lock;
 482         unsigned long flags;
 483
 484         for (i = 0; i < adapter->priv_num; ++i) {
 485                 head = &adapter->bss_prio_tbl[i].bss_prio_head;
 486                 cur = &adapter->bss_prio_tbl[i].bss_prio_cur;
 487                 lock = &adapter->bss_prio_tbl[i].bss_prio_lock;
 488                 dev_dbg(adapter->dev, "info: delete BSS priority table,"
 489                                 " index = %d, i = %d, head = %p, cur = %p\n",
 490                               priv->bss_index, i, head, *cur);
 491                 if (*cur) {
 492                         spin_lock_irqsave(lock, flags);
 493                         if (list_empty(head)) {
 494                                 spin_unlock_irqrestore(lock, flags);
 495                                 continue;
 496                         }
 497                         bssprio_node = list_first_entry(head,
 498                                         struct mwifiex_bss_prio_node, list);
 499                         spin_unlock_irqrestore(lock, flags);
 500
 501                         list_for_each_entry_safe(bssprio_node, tmp_node, head,
 502                                                  list) {
 503                                 if (bssprio_node->priv == priv) {
 504                                         dev_dbg(adapter->dev, "info: Delete "
 505                                                 "node %p, next = %p\n",
 506                                                 bssprio_node, tmp_node);
 507                                         spin_lock_irqsave(lock, flags);
 508                                         list_del(&bssprio_node->list);
 509                                         spin_unlock_irqrestore(lock, flags);
 510                                         kfree(bssprio_node);
 511                                 }
 512                         }
 513                         *cur = (struct mwifiex_bss_prio_node *)head;
 514                 }
 515         }
 516 }
 517
 518 /*
 519  * This function is used to shutdown the driver.
 520  *
 521  * The following operations are performed sequentially -
 522  *      - Check if already shut down
 523  *      - Make sure the main process has stopped
 524  *      - Clean up the Tx and Rx queues
 525  *      - Delete BSS priority tables
 526  *      - Free the adapter
 527  *      - Notify completion
 528  */
 529 int
 530 mwifiex_shutdown_drv(struct mwifiex_adapter *adapter)
 531 {
 532         int ret = -EINPROGRESS;
 533         struct mwifiex_private *priv;
 534         s32 i;
 535         unsigned long flags;
 536
 537         /* mwifiex already shutdown */
 538         if (adapter->hw_status == MWIFIEX_HW_STATUS_NOT_READY)
 539                 return 0;
 540
 541         adapter->hw_status = MWIFIEX_HW_STATUS_CLOSING;
 542         /* wait for mwifiex_process to complete */
 543         if (adapter->mwifiex_processing) {
 544                 dev_warn(adapter->dev, "main process is still running\n");
 545                 return ret;
 546         }
 547
 548         /* shut down mwifiex */
 549         dev_dbg(adapter->dev, "info: shutdown mwifiex...\n");
 550
 551         /* Clean up Tx/Rx queues and delete BSS priority table */
 552         for (i = 0; i < adapter->priv_num; i++) {
 553                 if (adapter->priv[i]) {
 554                         priv = adapter->priv[i];
 555
 556                         mwifiex_clean_txrx(priv);
 557                         mwifiex_delete_bss_prio_tbl(priv);
 558                 }
 559         }
 560
 561         spin_lock_irqsave(&adapter->mwifiex_lock, flags);
 562
 563         /* Free adapter structure */
 564         mwifiex_free_adapter(adapter);
 565
 566         spin_unlock_irqrestore(&adapter->mwifiex_lock, flags);
 567
 568         /* Notify completion */
 569         ret = mwifiex_shutdown_fw_complete(adapter);
 570
 571         return ret;
 572 }
 573
 574 /*
 575  * This function downloads the firmware to the card.
 576  *
 577  * The actual download is preceded by two sanity checks -
 578  *      - Check if firmware is already running
 579  *      - Check if the interface is the winner to download the firmware
 580  *
 581  * ...and followed by another -
 582  *      - Check if the firmware is downloaded successfully
 583  *
 584  * After download is successfully completed, the host interrupts are enabled.
 585  */
 586 int mwifiex_dnld_fw(struct mwifiex_adapter *adapter,
 587                     struct mwifiex_fw_image *pmfw)
 588 {
 589         int ret;
 590         u32 poll_num = 1;
 591
 592         adapter->winner = 0;
 593
 594         /* Check if firmware is already running */
 595         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 596         if (!ret) {
 597                 dev_notice(adapter->dev,
 598                                 "WLAN FW already running! Skip FW download\n");
 599                 goto done;
 600         }
 601         poll_num = MAX_FIRMWARE_POLL_TRIES;
 602
 603         /* Check if we are the winner for downloading FW */
 604         if (!adapter->winner) {
 605                 dev_notice(adapter->dev,
 606                                 "Other interface already running!"
 607                                 " Skip FW download\n");
 608                 poll_num = MAX_MULTI_INTERFACE_POLL_TRIES;
 609                 goto poll_fw;
 610         }
 611         if (pmfw) {
 612                 /* Download firmware with helper */
 613                 ret = adapter->if_ops.prog_fw(adapter, pmfw);
 614                 if (ret) {
 615                         dev_err(adapter->dev, "prog_fw failed ret=%#x\n", ret);
 616                         return ret;
 617                 }
 618         }
 619
 620 poll_fw:
 621         /* Check if the firmware is downloaded successfully or not */
 622         ret = adapter->if_ops.check_fw_status(adapter, poll_num);
 623         if (ret) {
 624                 dev_err(adapter->dev, "FW failed to be active in time\n");
 625                 return -1;
 626         }
 627 done:
 628         /* re-enable host interrupt for mwifiex after fw dnld is successful */
 629         adapter->if_ops.enable_int(adapter);
 630         return ret;
 631 }