drivers/pci/hotplug/pciehp_ctrl.c

   1 /*
   2  * PCI Express Hot Plug Controller Driver
   3  *
   4  * Copyright (C) 1995,2001 Compaq Computer Corporation
   5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2001 IBM Corp.
   7  * Copyright (C) 2003-2004 Intel Corporation
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or (at
  14  * your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27  *
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel.h>
  32 #include <linux/types.h>
  33 #include <linux/pci.h>
  34 #include <linux/workqueue.h>
  35 #include "../pci.h"
  36 #include "pciehp.h"
  37
  38 static void interrupt_event_handler(struct work_struct *work);
  39
  40 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  41 {
  42         struct event_info *info;
  43
  44         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  45         if (!info)
  46                 return -ENOMEM;
  47
  48         info->event_type = event_type;
  49         info->p_slot = p_slot;
  50         INIT_WORK(&info->work, interrupt_event_handler);
  51
  52         schedule_work(&info->work);
  53
  54         return 0;
  55 }
  56
  57 u8 pciehp_handle_attention_button(struct slot *p_slot)
  58 {
  59         u32 event_type;
  60         struct controller *ctrl = p_slot->ctrl;
  61
  62         /* Attention Button Change */
  63         ctrl_dbg(ctrl, "Attention button interrupt received\n");
  64
  65         /*
  66          *  Button pressed - See if need to TAKE ACTION!!!
  67          */
  68         ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
  69         event_type = INT_BUTTON_PRESS;
  70
  71         queue_interrupt_event(p_slot, event_type);
  72
  73         return 0;
  74 }
  75
  76 u8 pciehp_handle_switch_change(struct slot *p_slot)
  77 {
  78         u8 getstatus;
  79         u32 event_type;
  80         struct controller *ctrl = p_slot->ctrl;
  81
  82         /* Switch Change */
  83         ctrl_dbg(ctrl, "Switch interrupt received\n");
  84
  85         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  86         if (getstatus) {
  87                 /*
  88                  * Switch opened
  89                  */
  90                 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
  91                 event_type = INT_SWITCH_OPEN;
  92         } else {
  93                 /*
  94                  *  Switch closed
  95                  */
  96                 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
  97                 event_type = INT_SWITCH_CLOSE;
  98         }
  99
 100         queue_interrupt_event(p_slot, event_type);
 101
 102         return 1;
 103 }
 104
 105 u8 pciehp_handle_presence_change(struct slot *p_slot)
 106 {
 107         u32 event_type;
 108         u8 presence_save;
 109         struct controller *ctrl = p_slot->ctrl;
 110
 111         /* Presence Change */
 112         ctrl_dbg(ctrl, "Presence/Notify input change\n");
 113
 114         /* Switch is open, assume a presence change
 115          * Save the presence state
 116          */
 117         p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 118         if (presence_save) {
 119                 /*
 120                  * Card Present
 121                  */
 122                 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
 123                 event_type = INT_PRESENCE_ON;
 124         } else {
 125                 /*
 126                  * Not Present
 127                  */
 128                 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
 129                           slot_name(p_slot));
 130                 event_type = INT_PRESENCE_OFF;
 131         }
 132
 133         queue_interrupt_event(p_slot, event_type);
 134
 135         return 1;
 136 }
 137
 138 u8 pciehp_handle_power_fault(struct slot *p_slot)
 139 {
 140         u32 event_type;
 141         struct controller *ctrl = p_slot->ctrl;
 142
 143         /* power fault */
 144         ctrl_dbg(ctrl, "Power fault interrupt received\n");
 145
 146         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 147                 /*
 148                  * power fault Cleared
 149                  */
 150                 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
 151                           slot_name(p_slot));
 152                 event_type = INT_POWER_FAULT_CLEAR;
 153         } else {
 154                 /*
 155                  *   power fault
 156                  */
 157                 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
 158                 event_type = INT_POWER_FAULT;
 159                 ctrl_info(ctrl, "Power fault bit %x set\n", 0);
 160         }
 161
 162         queue_interrupt_event(p_slot, event_type);
 163
 164         return 1;
 165 }
 166
 167 /* The following routines constitute the bulk of the
 168    hotplug controller logic
 169  */
 170
 171 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 172 {
 173         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 174         if (POWER_CTRL(ctrl)) {
 175                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 176                         ctrl_err(ctrl,
 177                                  "Issue of Slot Power Off command failed\n");
 178                         return;
 179                 }
 180                 /*
 181                  * After turning power off, we must wait for at least 1 second
 182                  * before taking any action that relies on power having been
 183                  * removed from the slot/adapter.
 184                  */
 185                 msleep(1000);
 186         }
 187
 188         if (PWR_LED(ctrl))
 189                 pslot->hpc_ops->green_led_off(pslot);
 190
 191         if (ATTN_LED(ctrl)) {
 192                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 193                         ctrl_err(ctrl,
 194                                  "Issue of Set Attention Led command failed\n");
 195                         return;
 196                 }
 197         }
 198 }
 199
 200 /**
 201  * board_added - Called after a board has been added to the system.
 202  * @p_slot: &slot where board is added
 203  *
 204  * Turns power on for the board.
 205  * Configures board.
 206  */
 207 static int board_added(struct slot *p_slot)
 208 {
 209         int retval = 0;
 210         struct controller *ctrl = p_slot->ctrl;
 211         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 212
 213         ctrl_dbg(ctrl, "%s: slot device, slot offset, hp slot = %d, %d, %d\n",
 214                  __func__, p_slot->device, ctrl->slot_device_offset,
 215                  p_slot->hp_slot);
 216
 217         if (POWER_CTRL(ctrl)) {
 218                 /* Power on slot */
 219                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 220                 if (retval)
 221                         return retval;
 222         }
 223
 224         if (PWR_LED(ctrl))
 225                 p_slot->hpc_ops->green_led_blink(p_slot);
 226
 227         /* Check link training status */
 228         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 229         if (retval) {
 230                 ctrl_err(ctrl, "Failed to check link status\n");
 231                 set_slot_off(ctrl, p_slot);
 232                 return retval;
 233         }
 234
 235         /* Check for a power fault */
 236         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 237                 ctrl_dbg(ctrl, "Power fault detected\n");
 238                 retval = POWER_FAILURE;
 239                 goto err_exit;
 240         }
 241
 242         retval = pciehp_configure_device(p_slot);
 243         if (retval) {
 244                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 245                          pci_domain_nr(parent), parent->number,
 246                          p_slot->device);
 247                 goto err_exit;
 248         }
 249
 250         if (PWR_LED(ctrl))
 251                 p_slot->hpc_ops->green_led_on(p_slot);
 252
 253         return 0;
 254
 255 err_exit:
 256         set_slot_off(ctrl, p_slot);
 257         return retval;
 258 }
 259
 260 /**
 261  * remove_board - Turns off slot and LEDs
 262  * @p_slot: slot where board is being removed
 263  */
 264 static int remove_board(struct slot *p_slot)
 265 {
 266         int retval = 0;
 267         struct controller *ctrl = p_slot->ctrl;
 268
 269         retval = pciehp_unconfigure_device(p_slot);
 270         if (retval)
 271                 return retval;
 272
 273         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, p_slot->hp_slot);
 274
 275         if (POWER_CTRL(ctrl)) {
 276                 /* power off slot */
 277                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 278                 if (retval) {
 279                         ctrl_err(ctrl,
 280                                  "Issue of Slot Disable command failed\n");
 281                         return retval;
 282                 }
 283                 /*
 284                  * After turning power off, we must wait for at least 1 second
 285                  * before taking any action that relies on power having been
 286                  * removed from the slot/adapter.
 287                  */
 288                 msleep(1000);
 289         }
 290
 291         if (PWR_LED(ctrl))
 292                 /* turn off Green LED */
 293                 p_slot->hpc_ops->green_led_off(p_slot);
 294
 295         return 0;
 296 }
 297
 298 struct power_work_info {
 299         struct slot *p_slot;
 300         struct work_struct work;
 301 };
 302
 303 /**
 304  * pciehp_power_thread - handle pushbutton events
 305  * @work: &struct work_struct describing work to be done
 306  *
 307  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 308  * Handles all pending events and exits.
 309  */
 310 static void pciehp_power_thread(struct work_struct *work)
 311 {
 312         struct power_work_info *info =
 313                 container_of(work, struct power_work_info, work);
 314         struct slot *p_slot = info->p_slot;
 315
 316         mutex_lock(&p_slot->lock);
 317         switch (p_slot->state) {
 318         case POWEROFF_STATE:
 319                 mutex_unlock(&p_slot->lock);
 320                 ctrl_dbg(p_slot->ctrl,
 321                          "Disabling domain:bus:device=%04x:%02x:%02x\n",
 322                          pci_domain_nr(p_slot->ctrl->pci_dev->subordinate),
 323                          p_slot->ctrl->pci_dev->subordinate->number,
 324                          p_slot->device);
 325                 pciehp_disable_slot(p_slot);
 326                 mutex_lock(&p_slot->lock);
 327                 p_slot->state = STATIC_STATE;
 328                 break;
 329         case POWERON_STATE:
 330                 mutex_unlock(&p_slot->lock);
 331                 if (pciehp_enable_slot(p_slot) &&
 332                     PWR_LED(p_slot->ctrl))
 333                         p_slot->hpc_ops->green_led_off(p_slot);
 334                 mutex_lock(&p_slot->lock);
 335                 p_slot->state = STATIC_STATE;
 336                 break;
 337         default:
 338                 break;
 339         }
 340         mutex_unlock(&p_slot->lock);
 341
 342         kfree(info);
 343 }
 344
 345 void pciehp_queue_pushbutton_work(struct work_struct *work)
 346 {
 347         struct slot *p_slot = container_of(work, struct slot, work.work);
 348         struct power_work_info *info;
 349
 350         info = kmalloc(sizeof(*info), GFP_KERNEL);
 351         if (!info) {
 352                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 353                          __func__);
 354                 return;
 355         }
 356         info->p_slot = p_slot;
 357         INIT_WORK(&info->work, pciehp_power_thread);
 358
 359         mutex_lock(&p_slot->lock);
 360         switch (p_slot->state) {
 361         case BLINKINGOFF_STATE:
 362                 p_slot->state = POWEROFF_STATE;
 363                 break;
 364         case BLINKINGON_STATE:
 365                 p_slot->state = POWERON_STATE;
 366                 break;
 367         default:
 368                 goto out;
 369         }
 370         queue_work(pciehp_wq, &info->work);
 371  out:
 372         mutex_unlock(&p_slot->lock);
 373 }
 374
 375 static int update_slot_info(struct slot *slot)
 376 {
 377         struct hotplug_slot_info *info;
 378         int result;
 379
 380         info = kmalloc(sizeof(*info), GFP_KERNEL);
 381         if (!info)
 382                 return -ENOMEM;
 383
 384         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 385         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 386         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 387         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 388
 389         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 390         kfree (info);
 391         return result;
 392 }
 393
 394 /*
 395  * Note: This function must be called with slot->lock held
 396  */
 397 static void handle_button_press_event(struct slot *p_slot)
 398 {
 399         struct controller *ctrl = p_slot->ctrl;
 400         u8 getstatus;
 401
 402         switch (p_slot->state) {
 403         case STATIC_STATE:
 404                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 405                 if (getstatus) {
 406                         p_slot->state = BLINKINGOFF_STATE;
 407                         ctrl_info(ctrl,
 408                                   "PCI slot #%s - powering off due to button "
 409                                   "press.\n", slot_name(p_slot));
 410                 } else {
 411                         p_slot->state = BLINKINGON_STATE;
 412                         ctrl_info(ctrl,
 413                                   "PCI slot #%s - powering on due to button "
 414                                   "press.\n", slot_name(p_slot));
 415                 }
 416                 /* blink green LED and turn off amber */
 417                 if (PWR_LED(ctrl))
 418                         p_slot->hpc_ops->green_led_blink(p_slot);
 419                 if (ATTN_LED(ctrl))
 420                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 421
 422                 schedule_delayed_work(&p_slot->work, 5*HZ);
 423                 break;
 424         case BLINKINGOFF_STATE:
 425         case BLINKINGON_STATE:
 426                 /*
 427                  * Cancel if we are still blinking; this means that we
 428                  * press the attention again before the 5 sec. limit
 429                  * expires to cancel hot-add or hot-remove
 430                  */
 431                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 432                 cancel_delayed_work(&p_slot->work);
 433                 if (p_slot->state == BLINKINGOFF_STATE) {
 434                         if (PWR_LED(ctrl))
 435                                 p_slot->hpc_ops->green_led_on(p_slot);
 436                 } else {
 437                         if (PWR_LED(ctrl))
 438                                 p_slot->hpc_ops->green_led_off(p_slot);
 439                 }
 440                 if (ATTN_LED(ctrl))
 441                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 442                 ctrl_info(ctrl, "PCI slot #%s - action canceled "
 443                           "due to button press\n", slot_name(p_slot));
 444                 p_slot->state = STATIC_STATE;
 445                 break;
 446         case POWEROFF_STATE:
 447         case POWERON_STATE:
 448                 /*
 449                  * Ignore if the slot is on power-on or power-off state;
 450                  * this means that the previous attention button action
 451                  * to hot-add or hot-remove is undergoing
 452                  */
 453                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
 454                 update_slot_info(p_slot);
 455                 break;
 456         default:
 457                 ctrl_warn(ctrl, "Not a valid state\n");
 458                 break;
 459         }
 460 }
 461
 462 /*
 463  * Note: This function must be called with slot->lock held
 464  */
 465 static void handle_surprise_event(struct slot *p_slot)
 466 {
 467         u8 getstatus;
 468         struct power_work_info *info;
 469
 470         info = kmalloc(sizeof(*info), GFP_KERNEL);
 471         if (!info) {
 472                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 473                          __func__);
 474                 return;
 475         }
 476         info->p_slot = p_slot;
 477         INIT_WORK(&info->work, pciehp_power_thread);
 478
 479         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 480         if (!getstatus)
 481                 p_slot->state = POWEROFF_STATE;
 482         else
 483                 p_slot->state = POWERON_STATE;
 484
 485         queue_work(pciehp_wq, &info->work);
 486 }
 487
 488 static void interrupt_event_handler(struct work_struct *work)
 489 {
 490         struct event_info *info = container_of(work, struct event_info, work);
 491         struct slot *p_slot = info->p_slot;
 492         struct controller *ctrl = p_slot->ctrl;
 493
 494         mutex_lock(&p_slot->lock);
 495         switch (info->event_type) {
 496         case INT_BUTTON_PRESS:
 497                 handle_button_press_event(p_slot);
 498                 break;
 499         case INT_POWER_FAULT:
 500                 if (!POWER_CTRL(ctrl))
 501                         break;
 502                 if (ATTN_LED(ctrl))
 503                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 504                 if (PWR_LED(ctrl))
 505                         p_slot->hpc_ops->green_led_off(p_slot);
 506                 break;
 507         case INT_PRESENCE_ON:
 508         case INT_PRESENCE_OFF:
 509                 if (!HP_SUPR_RM(ctrl))
 510                         break;
 511                 ctrl_dbg(ctrl, "Surprise Removal\n");
 512                 update_slot_info(p_slot);
 513                 handle_surprise_event(p_slot);
 514                 break;
 515         default:
 516                 update_slot_info(p_slot);
 517                 break;
 518         }
 519         mutex_unlock(&p_slot->lock);
 520
 521         kfree(info);
 522 }
 523
 524 int pciehp_enable_slot(struct slot *p_slot)
 525 {
 526         u8 getstatus = 0;
 527         int rc;
 528         struct controller *ctrl = p_slot->ctrl;
 529
 530         /* Check to see if (latch closed, card present, power off) */
 531         mutex_lock(&p_slot->ctrl->crit_sect);
 532
 533         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 534         if (rc || !getstatus) {
 535                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 536                 mutex_unlock(&p_slot->ctrl->crit_sect);
 537                 return -ENODEV;
 538         }
 539         if (MRL_SENS(p_slot->ctrl)) {
 540                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 541                 if (rc || getstatus) {
 542                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 543                                   slot_name(p_slot));
 544                         mutex_unlock(&p_slot->ctrl->crit_sect);
 545                         return -ENODEV;
 546                 }
 547         }
 548
 549         if (POWER_CTRL(p_slot->ctrl)) {
 550                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 551                 if (rc || getstatus) {
 552                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 553                                   slot_name(p_slot));
 554                         mutex_unlock(&p_slot->ctrl->crit_sect);
 555                         return -EINVAL;
 556                 }
 557         }
 558
 559         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 560
 561         rc = board_added(p_slot);
 562         if (rc) {
 563                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 564         }
 565
 566         update_slot_info(p_slot);
 567
 568         mutex_unlock(&p_slot->ctrl->crit_sect);
 569         return rc;
 570 }
 571
 572
 573 int pciehp_disable_slot(struct slot *p_slot)
 574 {
 575         u8 getstatus = 0;
 576         int ret = 0;
 577         struct controller *ctrl = p_slot->ctrl;
 578
 579         if (!p_slot->ctrl)
 580                 return 1;
 581
 582         /* Check to see if (latch closed, card present, power on) */
 583         mutex_lock(&p_slot->ctrl->crit_sect);
 584
 585         if (!HP_SUPR_RM(p_slot->ctrl)) {
 586                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 587                 if (ret || !getstatus) {
 588                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
 589                                   slot_name(p_slot));
 590                         mutex_unlock(&p_slot->ctrl->crit_sect);
 591                         return -ENODEV;
 592                 }
 593         }
 594
 595         if (MRL_SENS(p_slot->ctrl)) {
 596                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 597                 if (ret || getstatus) {
 598                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 599                                   slot_name(p_slot));
 600                         mutex_unlock(&p_slot->ctrl->crit_sect);
 601                         return -ENODEV;
 602                 }
 603         }
 604
 605         if (POWER_CTRL(p_slot->ctrl)) {
 606                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 607                 if (ret || !getstatus) {
 608                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 609                                   slot_name(p_slot));
 610                         mutex_unlock(&p_slot->ctrl->crit_sect);
 611                         return -EINVAL;
 612                 }
 613         }
 614
 615         ret = remove_board(p_slot);
 616         update_slot_info(p_slot);
 617
 618         mutex_unlock(&p_slot->ctrl->crit_sect);
 619         return ret;
 620 }
 621
 622 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 623 {
 624         int retval = -ENODEV;
 625         struct controller *ctrl = p_slot->ctrl;
 626
 627         mutex_lock(&p_slot->lock);
 628         switch (p_slot->state) {
 629         case BLINKINGON_STATE:
 630                 cancel_delayed_work(&p_slot->work);
 631         case STATIC_STATE:
 632                 p_slot->state = POWERON_STATE;
 633                 mutex_unlock(&p_slot->lock);
 634                 retval = pciehp_enable_slot(p_slot);
 635                 mutex_lock(&p_slot->lock);
 636                 p_slot->state = STATIC_STATE;
 637                 break;
 638         case POWERON_STATE:
 639                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 640                           slot_name(p_slot));
 641                 break;
 642         case BLINKINGOFF_STATE:
 643         case POWEROFF_STATE:
 644                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 645                           slot_name(p_slot));
 646                 break;
 647         default:
 648                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 649                          slot_name(p_slot));
 650                 break;
 651         }
 652         mutex_unlock(&p_slot->lock);
 653
 654         return retval;
 655 }
 656
 657 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 658 {
 659         int retval = -ENODEV;
 660         struct controller *ctrl = p_slot->ctrl;
 661
 662         mutex_lock(&p_slot->lock);
 663         switch (p_slot->state) {
 664         case BLINKINGOFF_STATE:
 665                 cancel_delayed_work(&p_slot->work);
 666         case STATIC_STATE:
 667                 p_slot->state = POWEROFF_STATE;
 668                 mutex_unlock(&p_slot->lock);
 669                 retval = pciehp_disable_slot(p_slot);
 670                 mutex_lock(&p_slot->lock);
 671                 p_slot->state = STATIC_STATE;
 672                 break;
 673         case POWEROFF_STATE:
 674                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 675                           slot_name(p_slot));
 676                 break;
 677         case BLINKINGON_STATE:
 678         case POWERON_STATE:
 679                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 680                           slot_name(p_slot));
 681                 break;
 682         default:
 683                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 684                          slot_name(p_slot));
 685                 break;
 686         }
 687         mutex_unlock(&p_slot->lock);
 688
 689         return retval;
 690 }