drivers/net/wireless/iwlwifi/iwl-rx.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2010 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/etherdevice.h>
  31 #include <linux/slab.h>
  32 #include <net/mac80211.h>
  33 #include <asm/unaligned.h>
  34 #include "iwl-eeprom.h"
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-sta.h"
  38 #include "iwl-io.h"
  39 #include "iwl-calib.h"
  40 #include "iwl-helpers.h"
  41 /************************** RX-FUNCTIONS ****************************/
  42 /*
  43  * Rx theory of operation
  44  *
  45  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  46  * each of which point to Receive Buffers to be filled by the NIC.  These get
  47  * used not only for Rx frames, but for any command response or notification
  48  * from the NIC.  The driver and NIC manage the Rx buffers by means
  49  * of indexes into the circular buffer.
  50  *
  51  * Rx Queue Indexes
  52  * The host/firmware share two index registers for managing the Rx buffers.
  53  *
  54  * The READ index maps to the first position that the firmware may be writing
  55  * to -- the driver can read up to (but not including) this position and get
  56  * good data.
  57  * The READ index is managed by the firmware once the card is enabled.
  58  *
  59  * The WRITE index maps to the last position the driver has read from -- the
  60  * position preceding WRITE is the last slot the firmware can place a packet.
  61  *
  62  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  63  * WRITE = READ.
  64  *
  65  * During initialization, the host sets up the READ queue position to the first
  66  * INDEX position, and WRITE to the last (READ - 1 wrapped)
  67  *
  68  * When the firmware places a packet in a buffer, it will advance the READ index
  69  * and fire the RX interrupt.  The driver can then query the READ index and
  70  * process as many packets as possible, moving the WRITE index forward as it
  71  * resets the Rx queue buffers with new memory.
  72  *
  73  * The management in the driver is as follows:
  74  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  75  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  76  *   to replenish the iwl->rxq->rx_free.
  77  * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the
  78  *   iwl->rxq is replenished and the READ INDEX is updated (updating the
  79  *   'processed' and 'read' driver indexes as well)
  80  * + A received packet is processed and handed to the kernel network stack,
  81  *   detached from the iwl->rxq.  The driver 'processed' index is updated.
  82  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  83  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  84  *   INDEX is not incremented and iwl->status(RX_STALLED) is set.  If there
  85  *   were enough free buffers and RX_STALLED is set it is cleared.
  86  *
  87  *
  88  * Driver sequence:
  89  *
  90  * iwl_rx_queue_alloc()   Allocates rx_free
  91  * iwl_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  92  *                            iwl_rx_queue_restock
  93  * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx
  94  *                            queue, updates firmware pointers, and updates
  95  *                            the WRITE index.  If insufficient rx_free buffers
  96  *                            are available, schedules iwl_rx_replenish
  97  *
  98  * -- enable interrupts --
  99  * ISR - iwl_rx()         Detach iwl_rx_mem_buffers from pool up to the
 100  *                            READ INDEX, detaching the SKB from the pool.
 101  *                            Moves the packet buffer from queue to rx_used.
 102  *                            Calls iwl_rx_queue_restock to refill any empty
 103  *                            slots.
 104  * ...
 105  *
 106  */
 107
 108 /**
 109  * iwl_rx_queue_space - Return number of free slots available in queue.
 110  */
 111 int iwl_rx_queue_space(const struct iwl_rx_queue *q)
 112 {
 113         int s = q->read - q->write;
 114         if (s <= 0)
 115                 s += RX_QUEUE_SIZE;
 116         /* keep some buffer to not confuse full and empty queue */
 117         s -= 2;
 118         if (s < 0)
 119                 s = 0;
 120         return s;
 121 }
 122 EXPORT_SYMBOL(iwl_rx_queue_space);
 123
 124 /**
 125  * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue
 126  */
 127 void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 128 {
 129         unsigned long flags;
 130         u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg;
 131         u32 reg;
 132
 133         spin_lock_irqsave(&q->lock, flags);
 134
 135         if (q->need_update == 0)
 136                 goto exit_unlock;
 137
 138         /* If power-saving is in use, make sure device is awake */
 139         if (test_bit(STATUS_POWER_PMI, &priv->status)) {
 140                 reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 141
 142                 if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 143                         IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
 144                                       reg);
 145                         iwl_set_bit(priv, CSR_GP_CNTRL,
 146                                     CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 147                         goto exit_unlock;
 148                 }
 149
 150                 q->write_actual = (q->write & ~0x7);
 151                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 152
 153         /* Else device is assumed to be awake */
 154         } else {
 155                 /* Device expects a multiple of 8 */
 156                 q->write_actual = (q->write & ~0x7);
 157                 iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual);
 158         }
 159
 160         q->need_update = 0;
 161
 162  exit_unlock:
 163         spin_unlock_irqrestore(&q->lock, flags);
 164 }
 165 EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr);
 166
 167 int iwl_rx_queue_alloc(struct iwl_priv *priv)
 168 {
 169         struct iwl_rx_queue *rxq = &priv->rxq;
 170         struct device *dev = &priv->pci_dev->dev;
 171         int i;
 172
 173         spin_lock_init(&rxq->lock);
 174         INIT_LIST_HEAD(&rxq->rx_free);
 175         INIT_LIST_HEAD(&rxq->rx_used);
 176
 177         /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
 178         rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr,
 179                                      GFP_KERNEL);
 180         if (!rxq->bd)
 181                 goto err_bd;
 182
 183         rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status),
 184                                           &rxq->rb_stts_dma, GFP_KERNEL);
 185         if (!rxq->rb_stts)
 186                 goto err_rb;
 187
 188         /* Fill the rx_used queue with _all_ of the Rx buffers */
 189         for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
 190                 list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 191
 192         /* Set us so that we have processed and used all buffers, but have
 193          * not restocked the Rx queue with fresh buffers */
 194         rxq->read = rxq->write = 0;
 195         rxq->write_actual = 0;
 196         rxq->free_count = 0;
 197         rxq->need_update = 0;
 198         return 0;
 199
 200 err_rb:
 201         dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
 202                           rxq->dma_addr);
 203 err_bd:
 204         return -ENOMEM;
 205 }
 206 EXPORT_SYMBOL(iwl_rx_queue_alloc);
 207
 208 void iwl_rx_missed_beacon_notif(struct iwl_priv *priv,
 209                                 struct iwl_rx_mem_buffer *rxb)
 210
 211 {
 212         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 213         struct iwl_missed_beacon_notif *missed_beacon;
 214
 215         missed_beacon = &pkt->u.missed_beacon;
 216         if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
 217             priv->missed_beacon_threshold) {
 218                 IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
 219                     le32_to_cpu(missed_beacon->consecutive_missed_beacons),
 220                     le32_to_cpu(missed_beacon->total_missed_becons),
 221                     le32_to_cpu(missed_beacon->num_recvd_beacons),
 222                     le32_to_cpu(missed_beacon->num_expected_beacons));
 223                 if (!test_bit(STATUS_SCANNING, &priv->status))
 224                         iwl_init_sensitivity(priv);
 225         }
 226 }
 227 EXPORT_SYMBOL(iwl_rx_missed_beacon_notif);
 228
 229 void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv,
 230                                           struct iwl_rx_mem_buffer *rxb)
 231 {
 232         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 233         struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);
 234
 235         if (!report->state) {
 236                 IWL_DEBUG_11H(priv,
 237                         "Spectrum Measure Notification: Start\n");
 238                 return;
 239         }
 240
 241         memcpy(&priv->measure_report, report, sizeof(*report));
 242         priv->measurement_status |= MEASUREMENT_READY;
 243 }
 244 EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif);
 245
 246
 247
 248 /* Calculate noise level, based on measurements during network silence just
 249  *   before arriving beacon.  This measurement can be done only if we know
 250  *   exactly when to expect beacons, therefore only when we're associated. */
 251 static void iwl_rx_calc_noise(struct iwl_priv *priv)
 252 {
 253         struct statistics_rx_non_phy *rx_info
 254                                 = &(priv->statistics.rx.general);
 255         int num_active_rx = 0;
 256         int total_silence = 0;
 257         int bcn_silence_a =
 258                 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
 259         int bcn_silence_b =
 260                 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
 261         int bcn_silence_c =
 262                 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
 263         int last_rx_noise;
 264
 265         if (bcn_silence_a) {
 266                 total_silence += bcn_silence_a;
 267                 num_active_rx++;
 268         }
 269         if (bcn_silence_b) {
 270                 total_silence += bcn_silence_b;
 271                 num_active_rx++;
 272         }
 273         if (bcn_silence_c) {
 274                 total_silence += bcn_silence_c;
 275                 num_active_rx++;
 276         }
 277
 278         /* Average among active antennas */
 279         if (num_active_rx)
 280                 last_rx_noise = (total_silence / num_active_rx) - 107;
 281         else
 282                 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;
 283
 284         IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
 285                         bcn_silence_a, bcn_silence_b, bcn_silence_c,
 286                         last_rx_noise);
 287 }
 288
 289 #ifdef CONFIG_IWLWIFI_DEBUG
 290 /*
 291  *  based on the assumption of all statistics counter are in DWORD
 292  *  FIXME: This function is for debugging, do not deal with
 293  *  the case of counters roll-over.
 294  */
 295 static void iwl_accumulative_statistics(struct iwl_priv *priv,
 296                                         __le32 *stats)
 297 {
 298         int i;
 299         __le32 *prev_stats;
 300         u32 *accum_stats;
 301         u32 *delta, *max_delta;
 302
 303         prev_stats = (__le32 *)&priv->statistics;
 304         accum_stats = (u32 *)&priv->accum_statistics;
 305         delta = (u32 *)&priv->delta_statistics;
 306         max_delta = (u32 *)&priv->max_delta;
 307
 308         for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
 309              i += sizeof(__le32), stats++, prev_stats++, delta++,
 310              max_delta++, accum_stats++) {
 311                 if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) {
 312                         *delta = (le32_to_cpu(*stats) -
 313                                 le32_to_cpu(*prev_stats));
 314                         *accum_stats += *delta;
 315                         if (*delta > *max_delta)
 316                                 *max_delta = *delta;
 317                 }
 318         }
 319
 320         /* reset accumulative statistics for "no-counter" type statistics */
 321         priv->accum_statistics.general.temperature =
 322                 priv->statistics.general.temperature;
 323         priv->accum_statistics.general.temperature_m =
 324                 priv->statistics.general.temperature_m;
 325         priv->accum_statistics.general.ttl_timestamp =
 326                 priv->statistics.general.ttl_timestamp;
 327         priv->accum_statistics.tx.tx_power.ant_a =
 328                 priv->statistics.tx.tx_power.ant_a;
 329         priv->accum_statistics.tx.tx_power.ant_b =
 330                 priv->statistics.tx.tx_power.ant_b;
 331         priv->accum_statistics.tx.tx_power.ant_c =
 332                 priv->statistics.tx.tx_power.ant_c;
 333 }
 334 #endif
 335
 336 #define REG_RECALIB_PERIOD (60)
 337
 338 /**
 339  * iwl_good_plcp_health - checks for plcp error.
 340  *
 341  * When the plcp error is exceeding the thresholds, reset the radio
 342  * to improve the throughput.
 343  */
 344 bool iwl_good_plcp_health(struct iwl_priv *priv,
 345                                 struct iwl_rx_packet *pkt)
 346 {
 347         bool rc = true;
 348         int combined_plcp_delta;
 349         unsigned int plcp_msec;
 350         unsigned long plcp_received_jiffies;
 351
 352         /*
 353          * check for plcp_err and trigger radio reset if it exceeds
 354          * the plcp error threshold plcp_delta.
 355          */
 356         plcp_received_jiffies = jiffies;
 357         plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies -
 358                                         (long) priv->plcp_jiffies);
 359         priv->plcp_jiffies = plcp_received_jiffies;
 360         /*
 361          * check to make sure plcp_msec is not 0 to prevent division
 362          * by zero.
 363          */
 364         if (plcp_msec) {
 365                 combined_plcp_delta =
 366                         (le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err) -
 367                         le32_to_cpu(priv->statistics.rx.ofdm.plcp_err)) +
 368                         (le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err) -
 369                         le32_to_cpu(priv->statistics.rx.ofdm_ht.plcp_err));
 370
 371                 if ((combined_plcp_delta > 0) &&
 372                     ((combined_plcp_delta * 100) / plcp_msec) >
 373                         priv->cfg->plcp_delta_threshold) {
 374                         /*
 375                          * if plcp_err exceed the threshold,
 376                          * the following data is printed in csv format:
 377                          *    Text: plcp_err exceeded %d,
 378                          *    Received ofdm.plcp_err,
 379                          *    Current ofdm.plcp_err,
 380                          *    Received ofdm_ht.plcp_err,
 381                          *    Current ofdm_ht.plcp_err,
 382                          *    combined_plcp_delta,
 383                          *    plcp_msec
 384                          */
 385                         IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, "
 386                                 "%u, %u, %u, %u, %d, %u mSecs\n",
 387                                 priv->cfg->plcp_delta_threshold,
 388                                 le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err),
 389                                 le32_to_cpu(priv->statistics.rx.ofdm.plcp_err),
 390                                 le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err),
 391                                 le32_to_cpu(
 392                                   priv->statistics.rx.ofdm_ht.plcp_err),
 393                                 combined_plcp_delta, plcp_msec);
 394                         rc = false;
 395                 }
 396         }
 397         return rc;
 398 }
 399 EXPORT_SYMBOL(iwl_good_plcp_health);
 400
 401 void iwl_recover_from_statistics(struct iwl_priv *priv,
 402                                 struct iwl_rx_packet *pkt)
 403 {
 404         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
 405                 return;
 406         if (iwl_is_associated(priv)) {
 407                 if (priv->cfg->ops->lib->check_ack_health) {
 408                         if (!priv->cfg->ops->lib->check_ack_health(
 409                             priv, pkt)) {
 410                                 /*
 411                                  * low ack count detected
 412                                  * restart Firmware
 413                                  */
 414                                 IWL_ERR(priv, "low ack count detected, "
 415                                         "restart firmware\n");
 416                                 if (!iwl_force_reset(priv, IWL_FW_RESET))
 417                                         return;
 418                         }
 419                 }
 420                 if (priv->cfg->ops->lib->check_plcp_health) {
 421                         if (!priv->cfg->ops->lib->check_plcp_health(
 422                             priv, pkt)) {
 423                                 /*
 424                                  * high plcp error detected
 425                                  * reset Radio
 426                                  */
 427                                 iwl_force_reset(priv, IWL_RF_RESET);
 428                         }
 429                 }
 430         }
 431 }
 432 EXPORT_SYMBOL(iwl_recover_from_statistics);
 433
 434 void iwl_rx_statistics(struct iwl_priv *priv,
 435                               struct iwl_rx_mem_buffer *rxb)
 436 {
 437         int change;
 438         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 439
 440
 441         IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n",
 442                      (int)sizeof(priv->statistics),
 443                      le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK);
 444
 445         change = ((priv->statistics.general.temperature !=
 446                    pkt->u.stats.general.temperature) ||
 447                   ((priv->statistics.flag &
 448                     STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 449                    (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 450
 451 #ifdef CONFIG_IWLWIFI_DEBUG
 452         iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
 453 #endif
 454         iwl_recover_from_statistics(priv, pkt);
 455
 456         memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 457
 458         set_bit(STATUS_STATISTICS, &priv->status);
 459
 460         /* Reschedule the statistics timer to occur in
 461          * REG_RECALIB_PERIOD seconds to ensure we get a
 462          * thermal update even if the uCode doesn't give
 463          * us one */
 464         mod_timer(&priv->statistics_periodic, jiffies +
 465                   msecs_to_jiffies(REG_RECALIB_PERIOD * 1000));
 466
 467         if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
 468             (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
 469                 iwl_rx_calc_noise(priv);
 470                 queue_work(priv->workqueue, &priv->run_time_calib_work);
 471         }
 472         if (priv->cfg->ops->lib->temp_ops.temperature && change)
 473                 priv->cfg->ops->lib->temp_ops.temperature(priv);
 474 }
 475 EXPORT_SYMBOL(iwl_rx_statistics);
 476
 477 void iwl_reply_statistics(struct iwl_priv *priv,
 478                               struct iwl_rx_mem_buffer *rxb)
 479 {
 480         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 481
 482         if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
 483 #ifdef CONFIG_IWLWIFI_DEBUG
 484                 memset(&priv->accum_statistics, 0,
 485                         sizeof(struct iwl_notif_statistics));
 486                 memset(&priv->delta_statistics, 0,
 487                         sizeof(struct iwl_notif_statistics));
 488                 memset(&priv->max_delta, 0,
 489                         sizeof(struct iwl_notif_statistics));
 490 #endif
 491                 IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
 492         }
 493         iwl_rx_statistics(priv, rxb);
 494 }
 495 EXPORT_SYMBOL(iwl_reply_statistics);
 496
 497 /*
 498  * returns non-zero if packet should be dropped
 499  */
 500 int iwl_set_decrypted_flag(struct iwl_priv *priv,
 501                            struct ieee80211_hdr *hdr,
 502                            u32 decrypt_res,
 503                            struct ieee80211_rx_status *stats)
 504 {
 505         u16 fc = le16_to_cpu(hdr->frame_control);
 506
 507         if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
 508                 return 0;
 509
 510         if (!(fc & IEEE80211_FCTL_PROTECTED))
 511                 return 0;
 512
 513         IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
 514         switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
 515         case RX_RES_STATUS_SEC_TYPE_TKIP:
 516                 /* The uCode has got a bad phase 1 Key, pushes the packet.
 517                  * Decryption will be done in SW. */
 518                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 519                     RX_RES_STATUS_BAD_KEY_TTAK)
 520                         break;
 521
 522         case RX_RES_STATUS_SEC_TYPE_WEP:
 523                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 524                     RX_RES_STATUS_BAD_ICV_MIC) {
 525                         /* bad ICV, the packet is destroyed since the
 526                          * decryption is inplace, drop it */
 527                         IWL_DEBUG_RX(priv, "Packet destroyed\n");
 528                         return -1;
 529                 }
 530         case RX_RES_STATUS_SEC_TYPE_CCMP:
 531                 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
 532                     RX_RES_STATUS_DECRYPT_OK) {
 533                         IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
 534                         stats->flag |= RX_FLAG_DECRYPTED;
 535                 }
 536                 break;
 537
 538         default:
 539                 break;
 540         }
 541         return 0;
 542 }
 543 EXPORT_SYMBOL(iwl_set_decrypted_flag);