drivers/s390/scsi/zfcp_erp.c

   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13
  14 #define ZFCP_MAX_ERPS                   3
  15
  16 enum zfcp_erp_act_flags {
  17         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  18         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  19         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  20         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  21         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  22 };
  23
  24 enum zfcp_erp_steps {
  25         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  26         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  27         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  28         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  29         ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
  30         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  31         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  32         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  33 };
  34
  35 enum zfcp_erp_act_type {
  36         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  37         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  38         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  39         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  40 };
  41
  42 enum zfcp_erp_act_state {
  43         ZFCP_ERP_ACTION_RUNNING = 1,
  44         ZFCP_ERP_ACTION_READY   = 2,
  45 };
  46
  47 enum zfcp_erp_act_result {
  48         ZFCP_ERP_SUCCEEDED = 0,
  49         ZFCP_ERP_FAILED    = 1,
  50         ZFCP_ERP_CONTINUES = 2,
  51         ZFCP_ERP_EXIT      = 3,
  52         ZFCP_ERP_DISMISSED = 4,
  53         ZFCP_ERP_NOMEM     = 5,
  54 };
  55
  56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  57 {
  58         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  59                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  60                                        ZFCP_CLEAR);
  61 }
  62
  63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  64 {
  65         struct zfcp_erp_action *curr_act;
  66
  67         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  68                 if (act == curr_act)
  69                         return ZFCP_ERP_ACTION_RUNNING;
  70         return 0;
  71 }
  72
  73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  74 {
  75         struct zfcp_adapter *adapter = act->adapter;
  76
  77         list_move(&act->list, &act->adapter->erp_ready_head);
  78         zfcp_rec_dbf_event_action("erardy1", act);
  79         up(&adapter->erp_ready_sem);
  80         zfcp_rec_dbf_event_thread("erardy2", adapter);
  81 }
  82
  83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  84 {
  85         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  86         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  87                 zfcp_erp_action_ready(act);
  88 }
  89
  90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  91 {
  92         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  93                 zfcp_erp_action_dismiss(&unit->erp_action);
  94 }
  95
  96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  97 {
  98         struct zfcp_unit *unit;
  99
 100         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 101                 zfcp_erp_action_dismiss(&port->erp_action);
 102         else
 103                 list_for_each_entry(unit, &port->unit_list_head, list)
 104                     zfcp_erp_action_dismiss_unit(unit);
 105 }
 106
 107 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 108 {
 109         struct zfcp_port *port;
 110
 111         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 112                 zfcp_erp_action_dismiss(&adapter->erp_action);
 113         else
 114                 list_for_each_entry(port, &adapter->port_list_head, list)
 115                     zfcp_erp_action_dismiss_port(port);
 116 }
 117
 118 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 119                                  struct zfcp_port *port,
 120                                  struct zfcp_unit *unit)
 121 {
 122         int need = want;
 123         int u_status, p_status, a_status;
 124
 125         switch (want) {
 126         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 127                 u_status = atomic_read(&unit->status);
 128                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 129                         return 0;
 130                 p_status = atomic_read(&port->status);
 131                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 132                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 133                         return 0;
 134                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 135                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 136                 /* fall through */
 137         case ZFCP_ERP_ACTION_REOPEN_PORT:
 138         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 139                 p_status = atomic_read(&port->status);
 140                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 141                         return 0;
 142                 a_status = atomic_read(&adapter->status);
 143                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 144                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 145                         return 0;
 146                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 147                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 148                 /* fall through */
 149         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 150                 a_status = atomic_read(&adapter->status);
 151                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 152                         return 0;
 153         }
 154
 155         return need;
 156 }
 157
 158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 159                                                   struct zfcp_adapter *adapter,
 160                                                   struct zfcp_port *port,
 161                                                   struct zfcp_unit *unit)
 162 {
 163         struct zfcp_erp_action *erp_action;
 164         u32 status = 0;
 165
 166         switch (need) {
 167         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 168                 zfcp_unit_get(unit);
 169                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 170                 erp_action = &unit->erp_action;
 171                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 172                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 173                 break;
 174
 175         case ZFCP_ERP_ACTION_REOPEN_PORT:
 176         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 177                 zfcp_port_get(port);
 178                 zfcp_erp_action_dismiss_port(port);
 179                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 180                 erp_action = &port->erp_action;
 181                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 182                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 183                 break;
 184
 185         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 186                 zfcp_adapter_get(adapter);
 187                 zfcp_erp_action_dismiss_adapter(adapter);
 188                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 189                 erp_action = &adapter->erp_action;
 190                 if (!(atomic_read(&adapter->status) &
 191                       ZFCP_STATUS_COMMON_RUNNING))
 192                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 193                 break;
 194
 195         default:
 196                 return NULL;
 197         }
 198
 199         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 200         erp_action->adapter = adapter;
 201         erp_action->port = port;
 202         erp_action->unit = unit;
 203         erp_action->action = need;
 204         erp_action->status = status;
 205
 206         return erp_action;
 207 }
 208
 209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 210                                    struct zfcp_port *port,
 211                                    struct zfcp_unit *unit, char *id, void *ref)
 212 {
 213         int retval = 1, need;
 214         struct zfcp_erp_action *act = NULL;
 215
 216         if (!(atomic_read(&adapter->status) &
 217               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 218                 return -EIO;
 219
 220         need = zfcp_erp_required_act(want, adapter, port, unit);
 221         if (!need)
 222                 goto out;
 223
 224         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 225         act = zfcp_erp_setup_act(need, adapter, port, unit);
 226         if (!act)
 227                 goto out;
 228         ++adapter->erp_total_count;
 229         list_add_tail(&act->list, &adapter->erp_ready_head);
 230         up(&adapter->erp_ready_sem);
 231         zfcp_rec_dbf_event_thread("eracte1", adapter);
 232         retval = 0;
 233  out:
 234         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 235                                    adapter, port, unit);
 236         return retval;
 237 }
 238
 239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 240                                     int clear_mask, char *id, void *ref)
 241 {
 242         zfcp_erp_adapter_block(adapter, clear_mask);
 243         zfcp_scsi_schedule_rports_block(adapter);
 244
 245         /* ensure propagation of failed status to new devices */
 246         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 247                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 248                 return -EIO;
 249         }
 250         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 251                                        adapter, NULL, NULL, id, ref);
 252 }
 253
 254 /**
 255  * zfcp_erp_adapter_reopen - Reopen adapter.
 256  * @adapter: Adapter to reopen.
 257  * @clear: Status flags to clear.
 258  * @id: Id for debug trace event.
 259  * @ref: Reference for debug trace event.
 260  */
 261 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 262                              char *id, void *ref)
 263 {
 264         unsigned long flags;
 265
 266         read_lock_irqsave(&zfcp_data.config_lock, flags);
 267         write_lock(&adapter->erp_lock);
 268         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 269         write_unlock(&adapter->erp_lock);
 270         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 271 }
 272
 273 /**
 274  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 275  * @adapter: Adapter to shut down.
 276  * @clear: Status flags to clear.
 277  * @id: Id for debug trace event.
 278  * @ref: Reference for debug trace event.
 279  */
 280 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 281                                char *id, void *ref)
 282 {
 283         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 284         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 285 }
 286
 287 /**
 288  * zfcp_erp_port_shutdown - Shutdown port
 289  * @port: Port to shut down.
 290  * @clear: Status flags to clear.
 291  * @id: Id for debug trace event.
 292  * @ref: Reference for debug trace event.
 293  */
 294 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 295                             void *ref)
 296 {
 297         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 298         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 299 }
 300
 301 /**
 302  * zfcp_erp_unit_shutdown - Shutdown unit
 303  * @unit: Unit to shut down.
 304  * @clear: Status flags to clear.
 305  * @id: Id for debug trace event.
 306  * @ref: Reference for debug trace event.
 307  */
 308 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 309                             void *ref)
 310 {
 311         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 312         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 313 }
 314
 315 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 316 {
 317         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 318                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 319                                     ZFCP_CLEAR);
 320 }
 321
 322 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 323                                          int clear, char *id, void *ref)
 324 {
 325         zfcp_erp_port_block(port, clear);
 326         zfcp_scsi_schedule_rport_block(port);
 327
 328         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 329                 return;
 330
 331         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 332                                 port->adapter, port, NULL, id, ref);
 333 }
 334
 335 /**
 336  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 337  * @port: Port to force close and to reopen.
 338  * @id: Id for debug trace event.
 339  * @ref: Reference for debug trace event.
 340  */
 341 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 342                                  void *ref)
 343 {
 344         unsigned long flags;
 345         struct zfcp_adapter *adapter = port->adapter;
 346
 347         read_lock_irqsave(&zfcp_data.config_lock, flags);
 348         write_lock(&adapter->erp_lock);
 349         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 350         write_unlock(&adapter->erp_lock);
 351         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 352 }
 353
 354 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 355                                  void *ref)
 356 {
 357         zfcp_erp_port_block(port, clear);
 358         zfcp_scsi_schedule_rport_block(port);
 359
 360         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 361                 /* ensure propagation of failed status to new devices */
 362                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 363                 return -EIO;
 364         }
 365
 366         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 367                                        port->adapter, port, NULL, id, ref);
 368 }
 369
 370 /**
 371  * zfcp_erp_port_reopen - trigger remote port recovery
 372  * @port: port to recover
 373  * @clear_mask: flags in port status to be cleared
 374  *
 375  * Returns 0 if recovery has been triggered, < 0 if not.
 376  */
 377 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 378 {
 379         unsigned long flags;
 380         int retval;
 381         struct zfcp_adapter *adapter = port->adapter;
 382
 383         read_lock_irqsave(&zfcp_data.config_lock, flags);
 384         write_lock(&adapter->erp_lock);
 385         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 386         write_unlock(&adapter->erp_lock);
 387         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 388
 389         return retval;
 390 }
 391
 392 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 393 {
 394         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 395                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 396                                     ZFCP_CLEAR);
 397 }
 398
 399 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 400                                   void *ref)
 401 {
 402         struct zfcp_adapter *adapter = unit->port->adapter;
 403
 404         zfcp_erp_unit_block(unit, clear);
 405
 406         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 407                 return;
 408
 409         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 410                                 adapter, unit->port, unit, id, ref);
 411 }
 412
 413 /**
 414  * zfcp_erp_unit_reopen - initiate reopen of a unit
 415  * @unit: unit to be reopened
 416  * @clear_mask: specifies flags in unit status to be cleared
 417  * Return: 0 on success, < 0 on error
 418  */
 419 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 420                           void *ref)
 421 {
 422         unsigned long flags;
 423         struct zfcp_port *port = unit->port;
 424         struct zfcp_adapter *adapter = port->adapter;
 425
 426         read_lock_irqsave(&zfcp_data.config_lock, flags);
 427         write_lock(&adapter->erp_lock);
 428         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 429         write_unlock(&adapter->erp_lock);
 430         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 431 }
 432
 433 static int status_change_set(unsigned long mask, atomic_t *status)
 434 {
 435         return (atomic_read(status) ^ mask) & mask;
 436 }
 437
 438 static int status_change_clear(unsigned long mask, atomic_t *status)
 439 {
 440         return atomic_read(status) & mask;
 441 }
 442
 443 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 444 {
 445         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 446                 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
 447         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 448 }
 449
 450 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 451 {
 452         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 453                 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
 454         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 455 }
 456
 457 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 458 {
 459         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 460                 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
 461         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 462 }
 463
 464 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 465 {
 466         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 467         zfcp_rec_dbf_event_action("erator1", erp_action);
 468 }
 469
 470 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 471 {
 472         struct zfcp_adapter *adapter = act->adapter;
 473
 474         if (!act->fsf_req)
 475                 return;
 476
 477         spin_lock(&adapter->req_list_lock);
 478         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 479             act->fsf_req->erp_action == act) {
 480                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 481                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 482                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 483                         zfcp_rec_dbf_event_action("erscf_1", act);
 484                         act->fsf_req->erp_action = NULL;
 485                 }
 486                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 487                         zfcp_rec_dbf_event_action("erscf_2", act);
 488                 if (act->fsf_req->status & (ZFCP_STATUS_FSFREQ_COMPLETED |
 489                                             ZFCP_STATUS_FSFREQ_DISMISSED))
 490                         act->fsf_req = NULL;
 491         } else
 492                 act->fsf_req = NULL;
 493         spin_unlock(&adapter->req_list_lock);
 494 }
 495
 496 /**
 497  * zfcp_erp_notify - Trigger ERP action.
 498  * @erp_action: ERP action to continue.
 499  * @set_mask: ERP action status flags to set.
 500  */
 501 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 502 {
 503         struct zfcp_adapter *adapter = erp_action->adapter;
 504         unsigned long flags;
 505
 506         write_lock_irqsave(&adapter->erp_lock, flags);
 507         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 508                 erp_action->status |= set_mask;
 509                 zfcp_erp_action_ready(erp_action);
 510         }
 511         write_unlock_irqrestore(&adapter->erp_lock, flags);
 512 }
 513
 514 /**
 515  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 516  * @data: ERP action (from timer data)
 517  */
 518 void zfcp_erp_timeout_handler(unsigned long data)
 519 {
 520         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 521         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 522 }
 523
 524 static void zfcp_erp_memwait_handler(unsigned long data)
 525 {
 526         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 527 }
 528
 529 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 530 {
 531         init_timer(&erp_action->timer);
 532         erp_action->timer.function = zfcp_erp_memwait_handler;
 533         erp_action->timer.data = (unsigned long) erp_action;
 534         erp_action->timer.expires = jiffies + HZ;
 535         add_timer(&erp_action->timer);
 536 }
 537
 538 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 539                                       int clear, char *id, void *ref)
 540 {
 541         struct zfcp_port *port;
 542
 543         list_for_each_entry(port, &adapter->port_list_head, list)
 544                 _zfcp_erp_port_reopen(port, clear, id, ref);
 545 }
 546
 547 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 548                                       char *id, void *ref)
 549 {
 550         struct zfcp_unit *unit;
 551
 552         list_for_each_entry(unit, &port->unit_list_head, list)
 553                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 554 }
 555
 556 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 557 {
 558         switch (act->action) {
 559         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 560                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 561                 break;
 562         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 563                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 564                 break;
 565         case ZFCP_ERP_ACTION_REOPEN_PORT:
 566                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 567                 break;
 568         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 569                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 570                 break;
 571         }
 572 }
 573
 574 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 575 {
 576         switch (act->action) {
 577         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 578                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 579                 break;
 580         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 581                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 582                 break;
 583         case ZFCP_ERP_ACTION_REOPEN_PORT:
 584                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 585                 break;
 586         }
 587 }
 588
 589 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 590 {
 591         unsigned long flags;
 592
 593         read_lock_irqsave(&zfcp_data.config_lock, flags);
 594         read_lock(&adapter->erp_lock);
 595         if (list_empty(&adapter->erp_ready_head) &&
 596             list_empty(&adapter->erp_running_head)) {
 597                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 598                                           &adapter->status);
 599                         wake_up(&adapter->erp_done_wqh);
 600         }
 601         read_unlock(&adapter->erp_lock);
 602         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 603 }
 604
 605 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 606 {
 607         if (zfcp_qdio_open(act->adapter))
 608                 return ZFCP_ERP_FAILED;
 609         init_waitqueue_head(&act->adapter->request_wq);
 610         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 611         return ZFCP_ERP_SUCCEEDED;
 612 }
 613
 614 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 615 {
 616         struct zfcp_port *port;
 617         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 618                                  adapter->peer_d_id);
 619         if (IS_ERR(port)) /* error or port already attached */
 620                 return;
 621         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 622 }
 623
 624 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 625 {
 626         int retries;
 627         int sleep = 1;
 628         struct zfcp_adapter *adapter = erp_action->adapter;
 629
 630         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 631
 632         for (retries = 7; retries; retries--) {
 633                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 634                                   &adapter->status);
 635                 write_lock_irq(&adapter->erp_lock);
 636                 zfcp_erp_action_to_running(erp_action);
 637                 write_unlock_irq(&adapter->erp_lock);
 638                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 639                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 640                                           &adapter->status);
 641                         return ZFCP_ERP_FAILED;
 642                 }
 643
 644                 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
 645                 down(&adapter->erp_ready_sem);
 646                 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
 647                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 648                         break;
 649
 650                 if (!(atomic_read(&adapter->status) &
 651                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 652                         break;
 653
 654                 ssleep(sleep);
 655                 sleep *= 2;
 656         }
 657
 658         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 659                           &adapter->status);
 660
 661         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 662                 return ZFCP_ERP_FAILED;
 663
 664         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 665                 zfcp_erp_enqueue_ptp_port(adapter);
 666
 667         return ZFCP_ERP_SUCCEEDED;
 668 }
 669
 670 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 671 {
 672         int ret;
 673         struct zfcp_adapter *adapter = act->adapter;
 674
 675         write_lock_irq(&adapter->erp_lock);
 676         zfcp_erp_action_to_running(act);
 677         write_unlock_irq(&adapter->erp_lock);
 678
 679         ret = zfcp_fsf_exchange_port_data(act);
 680         if (ret == -EOPNOTSUPP)
 681                 return ZFCP_ERP_SUCCEEDED;
 682         if (ret)
 683                 return ZFCP_ERP_FAILED;
 684
 685         zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
 686         down(&adapter->erp_ready_sem);
 687         zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
 688         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 689                 return ZFCP_ERP_FAILED;
 690
 691         return ZFCP_ERP_SUCCEEDED;
 692 }
 693
 694 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 695 {
 696         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 697                 return ZFCP_ERP_FAILED;
 698
 699         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 700                 return ZFCP_ERP_FAILED;
 701
 702         atomic_set(&act->adapter->stat_miss, 16);
 703         if (zfcp_status_read_refill(act->adapter))
 704                 return ZFCP_ERP_FAILED;
 705
 706         return ZFCP_ERP_SUCCEEDED;
 707 }
 708
 709 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 710 {
 711         struct zfcp_adapter *adapter = act->adapter;
 712
 713         /* close queues to ensure that buffers are not accessed by adapter */
 714         zfcp_qdio_close(adapter);
 715         zfcp_fsf_req_dismiss_all(adapter);
 716         adapter->fsf_req_seq_no = 0;
 717         zfcp_fc_wka_port_force_offline(&adapter->gs->ds);
 718         /* all ports and units are closed */
 719         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 720                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 721
 722         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 723                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 724 }
 725
 726 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 727 {
 728         struct zfcp_adapter *adapter = act->adapter;
 729
 730         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 731                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 732                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 733                                   &adapter->status);
 734                 return ZFCP_ERP_FAILED;
 735         }
 736
 737         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 738                 zfcp_erp_adapter_strategy_close(act);
 739                 return ZFCP_ERP_FAILED;
 740         }
 741
 742         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 743
 744         return ZFCP_ERP_SUCCEEDED;
 745 }
 746
 747 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 748 {
 749         struct zfcp_adapter *adapter = act->adapter;
 750
 751         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 752                 zfcp_erp_adapter_strategy_close(act);
 753                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 754                         return ZFCP_ERP_EXIT;
 755         }
 756
 757         if (zfcp_erp_adapter_strategy_open(act)) {
 758                 ssleep(8);
 759                 return ZFCP_ERP_FAILED;
 760         }
 761
 762         return ZFCP_ERP_SUCCEEDED;
 763 }
 764
 765 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 766 {
 767         int retval;
 768
 769         retval = zfcp_fsf_close_physical_port(act);
 770         if (retval == -ENOMEM)
 771                 return ZFCP_ERP_NOMEM;
 772         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 773         if (retval)
 774                 return ZFCP_ERP_FAILED;
 775
 776         return ZFCP_ERP_CONTINUES;
 777 }
 778
 779 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 780 {
 781         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 782 }
 783
 784 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 785 {
 786         struct zfcp_port *port = erp_action->port;
 787         int status = atomic_read(&port->status);
 788
 789         switch (erp_action->step) {
 790         case ZFCP_ERP_STEP_UNINITIALIZED:
 791                 zfcp_erp_port_strategy_clearstati(port);
 792                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 793                     (status & ZFCP_STATUS_COMMON_OPEN))
 794                         return zfcp_erp_port_forced_strategy_close(erp_action);
 795                 else
 796                         return ZFCP_ERP_FAILED;
 797
 798         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 799                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 800                         return ZFCP_ERP_SUCCEEDED;
 801         }
 802         return ZFCP_ERP_FAILED;
 803 }
 804
 805 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 806 {
 807         int retval;
 808
 809         retval = zfcp_fsf_close_port(erp_action);
 810         if (retval == -ENOMEM)
 811                 return ZFCP_ERP_NOMEM;
 812         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 813         if (retval)
 814                 return ZFCP_ERP_FAILED;
 815         return ZFCP_ERP_CONTINUES;
 816 }
 817
 818 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 819 {
 820         int retval;
 821
 822         retval = zfcp_fsf_open_port(erp_action);
 823         if (retval == -ENOMEM)
 824                 return ZFCP_ERP_NOMEM;
 825         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 826         if (retval)
 827                 return ZFCP_ERP_FAILED;
 828         return ZFCP_ERP_CONTINUES;
 829 }
 830
 831 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 832 {
 833         struct zfcp_adapter *adapter = act->adapter;
 834         struct zfcp_port *port = act->port;
 835
 836         if (port->wwpn != adapter->peer_wwpn) {
 837                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 838                 return ZFCP_ERP_FAILED;
 839         }
 840         port->d_id = adapter->peer_d_id;
 841         return zfcp_erp_port_strategy_open_port(act);
 842 }
 843
 844 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 845 {
 846         int retval;
 847         struct zfcp_port *port = container_of(work, struct zfcp_port,
 848                                               gid_pn_work);
 849
 850         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 851         if (!retval) {
 852                 port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 853                 goto out;
 854         }
 855         if (retval == -ENOMEM) {
 856                 zfcp_erp_notify(&port->erp_action, ZFCP_STATUS_ERP_LOWMEM);
 857                 goto out;
 858         }
 859         /* all other error condtions */
 860         zfcp_erp_notify(&port->erp_action, 0);
 861 out:
 862         zfcp_port_put(port);
 863 }
 864
 865 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 866 {
 867         struct zfcp_adapter *adapter = act->adapter;
 868         struct zfcp_port *port = act->port;
 869         int p_status = atomic_read(&port->status);
 870
 871         switch (act->step) {
 872         case ZFCP_ERP_STEP_UNINITIALIZED:
 873         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 874         case ZFCP_ERP_STEP_PORT_CLOSING:
 875                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 876                         return zfcp_erp_open_ptp_port(act);
 877                 if (!port->d_id) {
 878                         zfcp_port_get(port);
 879                         if (!queue_work(zfcp_data.work_queue,
 880                                         &port->gid_pn_work))
 881                                 zfcp_port_put(port);
 882                         return ZFCP_ERP_CONTINUES;
 883                 }
 884                 /* fall through */
 885         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 886                 if (!port->d_id)
 887                         return ZFCP_ERP_FAILED;
 888                 return zfcp_erp_port_strategy_open_port(act);
 889
 890         case ZFCP_ERP_STEP_PORT_OPENING:
 891                 /* D_ID might have changed during open */
 892                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 893                         if (port->d_id)
 894                                 return ZFCP_ERP_SUCCEEDED;
 895                         else {
 896                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 897                                 return ZFCP_ERP_CONTINUES;
 898                         }
 899                 }
 900                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 901                         port->d_id = 0;
 902                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 903                         return ZFCP_ERP_EXIT;
 904                 }
 905                 /* fall through otherwise */
 906         }
 907         return ZFCP_ERP_FAILED;
 908 }
 909
 910 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 911 {
 912         struct zfcp_port *port = erp_action->port;
 913
 914         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 915                 goto close_init_done;
 916
 917         switch (erp_action->step) {
 918         case ZFCP_ERP_STEP_UNINITIALIZED:
 919                 zfcp_erp_port_strategy_clearstati(port);
 920                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 921                         return zfcp_erp_port_strategy_close(erp_action);
 922                 break;
 923
 924         case ZFCP_ERP_STEP_PORT_CLOSING:
 925                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 926                         return ZFCP_ERP_FAILED;
 927                 break;
 928         }
 929
 930 close_init_done:
 931         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 932                 return ZFCP_ERP_EXIT;
 933
 934         return zfcp_erp_port_strategy_open_common(erp_action);
 935 }
 936
 937 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 938 {
 939         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 940                           ZFCP_STATUS_UNIT_SHARED |
 941                           ZFCP_STATUS_UNIT_READONLY,
 942                           &unit->status);
 943 }
 944
 945 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 946 {
 947         int retval = zfcp_fsf_close_unit(erp_action);
 948         if (retval == -ENOMEM)
 949                 return ZFCP_ERP_NOMEM;
 950         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 951         if (retval)
 952                 return ZFCP_ERP_FAILED;
 953         return ZFCP_ERP_CONTINUES;
 954 }
 955
 956 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 957 {
 958         int retval = zfcp_fsf_open_unit(erp_action);
 959         if (retval == -ENOMEM)
 960                 return ZFCP_ERP_NOMEM;
 961         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 962         if (retval)
 963                 return  ZFCP_ERP_FAILED;
 964         return ZFCP_ERP_CONTINUES;
 965 }
 966
 967 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 968 {
 969         struct zfcp_unit *unit = erp_action->unit;
 970
 971         switch (erp_action->step) {
 972         case ZFCP_ERP_STEP_UNINITIALIZED:
 973                 zfcp_erp_unit_strategy_clearstati(unit);
 974                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 975                         return zfcp_erp_unit_strategy_close(erp_action);
 976                 /* already closed, fall through */
 977         case ZFCP_ERP_STEP_UNIT_CLOSING:
 978                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 979                         return ZFCP_ERP_FAILED;
 980                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 981                         return ZFCP_ERP_EXIT;
 982                 return zfcp_erp_unit_strategy_open(erp_action);
 983
 984         case ZFCP_ERP_STEP_UNIT_OPENING:
 985                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 986                         return ZFCP_ERP_SUCCEEDED;
 987         }
 988         return ZFCP_ERP_FAILED;
 989 }
 990
 991 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 992 {
 993         switch (result) {
 994         case ZFCP_ERP_SUCCEEDED :
 995                 atomic_set(&unit->erp_counter, 0);
 996                 zfcp_erp_unit_unblock(unit);
 997                 break;
 998         case ZFCP_ERP_FAILED :
 999                 atomic_inc(&unit->erp_counter);
1000                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
1001                         dev_err(&unit->port->adapter->ccw_device->dev,
1002                                 "ERP failed for unit 0x%016Lx on "
1003                                 "port 0x%016Lx\n",
1004                                 (unsigned long long)unit->fcp_lun,
1005                                 (unsigned long long)unit->port->wwpn);
1006                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
1007                 }
1008                 break;
1009         }
1010
1011         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1012                 zfcp_erp_unit_block(unit, 0);
1013                 result = ZFCP_ERP_EXIT;
1014         }
1015         return result;
1016 }
1017
1018 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1019 {
1020         switch (result) {
1021         case ZFCP_ERP_SUCCEEDED :
1022                 atomic_set(&port->erp_counter, 0);
1023                 zfcp_erp_port_unblock(port);
1024                 break;
1025
1026         case ZFCP_ERP_FAILED :
1027                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1028                         zfcp_erp_port_block(port, 0);
1029                         result = ZFCP_ERP_EXIT;
1030                 }
1031                 atomic_inc(&port->erp_counter);
1032                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1033                         dev_err(&port->adapter->ccw_device->dev,
1034                                 "ERP failed for remote port 0x%016Lx\n",
1035                                 (unsigned long long)port->wwpn);
1036                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1037                 }
1038                 break;
1039         }
1040
1041         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1042                 zfcp_erp_port_block(port, 0);
1043                 result = ZFCP_ERP_EXIT;
1044         }
1045         return result;
1046 }
1047
1048 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1049                                            int result)
1050 {
1051         switch (result) {
1052         case ZFCP_ERP_SUCCEEDED :
1053                 atomic_set(&adapter->erp_counter, 0);
1054                 zfcp_erp_adapter_unblock(adapter);
1055                 break;
1056
1057         case ZFCP_ERP_FAILED :
1058                 atomic_inc(&adapter->erp_counter);
1059                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1060                         dev_err(&adapter->ccw_device->dev,
1061                                 "ERP cannot recover an error "
1062                                 "on the FCP device\n");
1063                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1064                 }
1065                 break;
1066         }
1067
1068         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1069                 zfcp_erp_adapter_block(adapter, 0);
1070                 result = ZFCP_ERP_EXIT;
1071         }
1072         return result;
1073 }
1074
1075 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1076                                           int result)
1077 {
1078         struct zfcp_adapter *adapter = erp_action->adapter;
1079         struct zfcp_port *port = erp_action->port;
1080         struct zfcp_unit *unit = erp_action->unit;
1081
1082         switch (erp_action->action) {
1083
1084         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1085                 result = zfcp_erp_strategy_check_unit(unit, result);
1086                 break;
1087
1088         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1089         case ZFCP_ERP_ACTION_REOPEN_PORT:
1090                 result = zfcp_erp_strategy_check_port(port, result);
1091                 break;
1092
1093         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1094                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1095                 break;
1096         }
1097         return result;
1098 }
1099
1100 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1101 {
1102         int status = atomic_read(target_status);
1103
1104         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1105             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1106                 return 1; /* take it online */
1107
1108         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1109             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1110                 return 1; /* take it offline */
1111
1112         return 0;
1113 }
1114
1115 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1116 {
1117         int action = act->action;
1118         struct zfcp_adapter *adapter = act->adapter;
1119         struct zfcp_port *port = act->port;
1120         struct zfcp_unit *unit = act->unit;
1121         u32 erp_status = act->status;
1122
1123         switch (action) {
1124         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1125                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1126                         _zfcp_erp_adapter_reopen(adapter,
1127                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1128                                                  "ersscg1", NULL);
1129                         return ZFCP_ERP_EXIT;
1130                 }
1131                 break;
1132
1133         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1134         case ZFCP_ERP_ACTION_REOPEN_PORT:
1135                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1136                         _zfcp_erp_port_reopen(port,
1137                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1138                                               "ersscg2", NULL);
1139                         return ZFCP_ERP_EXIT;
1140                 }
1141                 break;
1142
1143         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1144                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1145                         _zfcp_erp_unit_reopen(unit,
1146                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1147                                               "ersscg3", NULL);
1148                         return ZFCP_ERP_EXIT;
1149                 }
1150                 break;
1151         }
1152         return ret;
1153 }
1154
1155 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1156 {
1157         struct zfcp_adapter *adapter = erp_action->adapter;
1158
1159         adapter->erp_total_count--;
1160         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1161                 adapter->erp_low_mem_count--;
1162                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1163         }
1164
1165         list_del(&erp_action->list);
1166         zfcp_rec_dbf_event_action("eractd1", erp_action);
1167
1168         switch (erp_action->action) {
1169         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1170                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1171                                   &erp_action->unit->status);
1172                 break;
1173
1174         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1175         case ZFCP_ERP_ACTION_REOPEN_PORT:
1176                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1177                                   &erp_action->port->status);
1178                 break;
1179
1180         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1181                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1182                                   &erp_action->adapter->status);
1183                 break;
1184         }
1185 }
1186
1187 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1188 {
1189         struct zfcp_adapter *adapter = act->adapter;
1190         struct zfcp_port *port = act->port;
1191         struct zfcp_unit *unit = act->unit;
1192
1193         switch (act->action) {
1194         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1195                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1196                         zfcp_unit_get(unit);
1197                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1198                                             &unit->scsi_work) <= 0)
1199                                 zfcp_unit_put(unit);
1200                 }
1201                 zfcp_unit_put(unit);
1202                 break;
1203
1204         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1205         case ZFCP_ERP_ACTION_REOPEN_PORT:
1206                 if (result == ZFCP_ERP_SUCCEEDED)
1207                         zfcp_scsi_schedule_rport_register(port);
1208                 zfcp_port_put(port);
1209                 break;
1210
1211         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1212                 if (result == ZFCP_ERP_SUCCEEDED) {
1213                         register_service_level(&adapter->service_level);
1214                         schedule_work(&adapter->scan_work);
1215                 } else
1216                         unregister_service_level(&adapter->service_level);
1217                 zfcp_adapter_put(adapter);
1218                 break;
1219         }
1220 }
1221
1222 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1223 {
1224         switch (erp_action->action) {
1225         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1226                 return zfcp_erp_adapter_strategy(erp_action);
1227         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1228                 return zfcp_erp_port_forced_strategy(erp_action);
1229         case ZFCP_ERP_ACTION_REOPEN_PORT:
1230                 return zfcp_erp_port_strategy(erp_action);
1231         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1232                 return zfcp_erp_unit_strategy(erp_action);
1233         }
1234         return ZFCP_ERP_FAILED;
1235 }
1236
1237 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1238 {
1239         int retval;
1240         struct zfcp_adapter *adapter = erp_action->adapter;
1241         unsigned long flags;
1242
1243         read_lock_irqsave(&zfcp_data.config_lock, flags);
1244         write_lock(&adapter->erp_lock);
1245
1246         zfcp_erp_strategy_check_fsfreq(erp_action);
1247
1248         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1249                 zfcp_erp_action_dequeue(erp_action);
1250                 retval = ZFCP_ERP_DISMISSED;
1251                 goto unlock;
1252         }
1253
1254         zfcp_erp_action_to_running(erp_action);
1255
1256         /* no lock to allow for blocking operations */
1257         write_unlock(&adapter->erp_lock);
1258         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1259         retval = zfcp_erp_strategy_do_action(erp_action);
1260         read_lock_irqsave(&zfcp_data.config_lock, flags);
1261         write_lock(&adapter->erp_lock);
1262
1263         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1264                 retval = ZFCP_ERP_CONTINUES;
1265
1266         switch (retval) {
1267         case ZFCP_ERP_NOMEM:
1268                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1269                         ++adapter->erp_low_mem_count;
1270                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1271                 }
1272                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1273                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1274                 else {
1275                         zfcp_erp_strategy_memwait(erp_action);
1276                         retval = ZFCP_ERP_CONTINUES;
1277                 }
1278                 goto unlock;
1279
1280         case ZFCP_ERP_CONTINUES:
1281                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1282                         --adapter->erp_low_mem_count;
1283                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1284                 }
1285                 goto unlock;
1286         }
1287
1288         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1289         zfcp_erp_action_dequeue(erp_action);
1290         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1291         if (retval == ZFCP_ERP_EXIT)
1292                 goto unlock;
1293         if (retval == ZFCP_ERP_SUCCEEDED)
1294                 zfcp_erp_strategy_followup_success(erp_action);
1295         if (retval == ZFCP_ERP_FAILED)
1296                 zfcp_erp_strategy_followup_failed(erp_action);
1297
1298  unlock:
1299         write_unlock(&adapter->erp_lock);
1300         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1301
1302         if (retval != ZFCP_ERP_CONTINUES)
1303                 zfcp_erp_action_cleanup(erp_action, retval);
1304
1305         return retval;
1306 }
1307
1308 static int zfcp_erp_thread(void *data)
1309 {
1310         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1311         struct list_head *next;
1312         struct zfcp_erp_action *act;
1313         unsigned long flags;
1314         int ignore;
1315
1316         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1317         /* Block all signals */
1318         siginitsetinv(&current->blocked, 0);
1319         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1320         wake_up(&adapter->erp_thread_wqh);
1321
1322         while (!(atomic_read(&adapter->status) &
1323                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1324
1325                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1326                 ignore = down_interruptible(&adapter->erp_ready_sem);
1327                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1328
1329                 write_lock_irqsave(&adapter->erp_lock, flags);
1330                 next = adapter->erp_ready_head.next;
1331                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1332
1333                 if (next != &adapter->erp_ready_head) {
1334                         act = list_entry(next, struct zfcp_erp_action, list);
1335
1336                         /* there is more to come after dismission, no notify */
1337                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1338                                 zfcp_erp_wakeup(adapter);
1339                 }
1340         }
1341
1342         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1343         wake_up(&adapter->erp_thread_wqh);
1344
1345         return 0;
1346 }
1347
1348 /**
1349  * zfcp_erp_thread_setup - Start ERP thread for adapter
1350  * @adapter: Adapter to start the ERP thread for
1351  *
1352  * Returns 0 on success or error code from kernel_thread()
1353  */
1354 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1355 {
1356         int retval;
1357
1358         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1359         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1360         if (retval < 0) {
1361                 dev_err(&adapter->ccw_device->dev,
1362                         "Creating an ERP thread for the FCP device failed.\n");
1363                 return retval;
1364         }
1365         wait_event(adapter->erp_thread_wqh,
1366                    atomic_read(&adapter->status) &
1367                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1368         return 0;
1369 }
1370
1371 /**
1372  * zfcp_erp_thread_kill - Stop ERP thread.
1373  * @adapter: Adapter where the ERP thread should be stopped.
1374  *
1375  * The caller of this routine ensures that the specified adapter has
1376  * been shut down and that this operation has been completed. Thus,
1377  * there are no pending erp_actions which would need to be handled
1378  * here.
1379  */
1380 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1381 {
1382         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1383         up(&adapter->erp_ready_sem);
1384         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1385
1386         wait_event(adapter->erp_thread_wqh,
1387                    !(atomic_read(&adapter->status) &
1388                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1389
1390         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1391                           &adapter->status);
1392 }
1393
1394 /**
1395  * zfcp_erp_adapter_failed - Set adapter status to failed.
1396  * @adapter: Failed adapter.
1397  * @id: Event id for debug trace.
1398  * @ref: Reference for debug trace.
1399  */
1400 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1401 {
1402         zfcp_erp_modify_adapter_status(adapter, id, ref,
1403                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1404 }
1405
1406 /**
1407  * zfcp_erp_port_failed - Set port status to failed.
1408  * @port: Failed port.
1409  * @id: Event id for debug trace.
1410  * @ref: Reference for debug trace.
1411  */
1412 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1413 {
1414         zfcp_erp_modify_port_status(port, id, ref,
1415                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1416 }
1417
1418 /**
1419  * zfcp_erp_unit_failed - Set unit status to failed.
1420  * @unit: Failed unit.
1421  * @id: Event id for debug trace.
1422  * @ref: Reference for debug trace.
1423  */
1424 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1425 {
1426         zfcp_erp_modify_unit_status(unit, id, ref,
1427                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1428 }
1429
1430 /**
1431  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1432  * @adapter: adapter for which to wait for completion of its error recovery
1433  */
1434 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1435 {
1436         wait_event(adapter->erp_done_wqh,
1437                    !(atomic_read(&adapter->status) &
1438                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1439 }
1440
1441 /**
1442  * zfcp_erp_modify_adapter_status - change adapter status bits
1443  * @adapter: adapter to change the status
1444  * @id: id for the debug trace
1445  * @ref: reference for the debug trace
1446  * @mask: status bits to change
1447  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1448  *
1449  * Changes in common status bits are propagated to attached ports and units.
1450  */
1451 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1452                                     void *ref, u32 mask, int set_or_clear)
1453 {
1454         struct zfcp_port *port;
1455         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1456
1457         if (set_or_clear == ZFCP_SET) {
1458                 if (status_change_set(mask, &adapter->status))
1459                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1460                 atomic_set_mask(mask, &adapter->status);
1461         } else {
1462                 if (status_change_clear(mask, &adapter->status))
1463                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1464                 atomic_clear_mask(mask, &adapter->status);
1465                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1466                         atomic_set(&adapter->erp_counter, 0);
1467         }
1468
1469         if (common_mask)
1470                 list_for_each_entry(port, &adapter->port_list_head, list)
1471                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1472                                                     set_or_clear);
1473 }
1474
1475 /**
1476  * zfcp_erp_modify_port_status - change port status bits
1477  * @port: port to change the status bits
1478  * @id: id for the debug trace
1479  * @ref: reference for the debug trace
1480  * @mask: status bits to change
1481  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1482  *
1483  * Changes in common status bits are propagated to attached units.
1484  */
1485 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1486                                  u32 mask, int set_or_clear)
1487 {
1488         struct zfcp_unit *unit;
1489         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1490
1491         if (set_or_clear == ZFCP_SET) {
1492                 if (status_change_set(mask, &port->status))
1493                         zfcp_rec_dbf_event_port(id, ref, port);
1494                 atomic_set_mask(mask, &port->status);
1495         } else {
1496                 if (status_change_clear(mask, &port->status))
1497                         zfcp_rec_dbf_event_port(id, ref, port);
1498                 atomic_clear_mask(mask, &port->status);
1499                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1500                         atomic_set(&port->erp_counter, 0);
1501         }
1502
1503         if (common_mask)
1504                 list_for_each_entry(unit, &port->unit_list_head, list)
1505                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1506                                                     set_or_clear);
1507 }
1508
1509 /**
1510  * zfcp_erp_modify_unit_status - change unit status bits
1511  * @unit: unit to change the status bits
1512  * @id: id for the debug trace
1513  * @ref: reference for the debug trace
1514  * @mask: status bits to change
1515  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1516  */
1517 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1518                                  u32 mask, int set_or_clear)
1519 {
1520         if (set_or_clear == ZFCP_SET) {
1521                 if (status_change_set(mask, &unit->status))
1522                         zfcp_rec_dbf_event_unit(id, ref, unit);
1523                 atomic_set_mask(mask, &unit->status);
1524         } else {
1525                 if (status_change_clear(mask, &unit->status))
1526                         zfcp_rec_dbf_event_unit(id, ref, unit);
1527                 atomic_clear_mask(mask, &unit->status);
1528                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1529                         atomic_set(&unit->erp_counter, 0);
1530                 }
1531         }
1532 }
1533
1534 /**
1535  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1536  * @port: The "boxed" port.
1537  * @id: The debug trace id.
1538  * @id: Reference for the debug trace.
1539  */
1540 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1541 {
1542         unsigned long flags;
1543
1544         read_lock_irqsave(&zfcp_data.config_lock, flags);
1545         zfcp_erp_modify_port_status(port, id, ref,
1546                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1547         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1548         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1549 }
1550
1551 /**
1552  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1553  * @port: The "boxed" unit.
1554  * @id: The debug trace id.
1555  * @id: Reference for the debug trace.
1556  */
1557 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1558 {
1559         zfcp_erp_modify_unit_status(unit, id, ref,
1560                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1561         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1562 }
1563
1564 /**
1565  * zfcp_erp_port_access_denied - Adapter denied access to port.
1566  * @port: port where access has been denied
1567  * @id: id for debug trace
1568  * @ref: reference for debug trace
1569  *
1570  * Since the adapter has denied access, stop using the port and the
1571  * attached units.
1572  */
1573 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1574 {
1575         unsigned long flags;
1576
1577         read_lock_irqsave(&zfcp_data.config_lock, flags);
1578         zfcp_erp_modify_port_status(port, id, ref,
1579                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1580                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1581         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1582 }
1583
1584 /**
1585  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1586  * @unit: unit where access has been denied
1587  * @id: id for debug trace
1588  * @ref: reference for debug trace
1589  *
1590  * Since the adapter has denied access, stop using the unit.
1591  */
1592 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1593 {
1594         zfcp_erp_modify_unit_status(unit, id, ref,
1595                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1596                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1597 }
1598
1599 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1600                                          void *ref)
1601 {
1602         int status = atomic_read(&unit->status);
1603         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1604                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1605                 return;
1606
1607         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1608 }
1609
1610 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1611                                          void *ref)
1612 {
1613         struct zfcp_unit *unit;
1614         int status = atomic_read(&port->status);
1615
1616         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1617                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1618                 list_for_each_entry(unit, &port->unit_list_head, list)
1619                                     zfcp_erp_unit_access_changed(unit, id, ref);
1620                 return;
1621         }
1622
1623         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1624 }
1625
1626 /**
1627  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1628  * @adapter: Adapter where the Access Control Table (ACT) changed
1629  * @id: Id for debug trace
1630  * @ref: Reference for debug trace
1631  */
1632 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1633                                      void *ref)
1634 {
1635         struct zfcp_port *port;
1636         unsigned long flags;
1637
1638         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1639                 return;
1640
1641         read_lock_irqsave(&zfcp_data.config_lock, flags);
1642         list_for_each_entry(port, &adapter->port_list_head, list)
1643                 zfcp_erp_port_access_changed(port, id, ref);
1644         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1645 }