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/smp_lock.h>
  34 #include <linux/pci.h>
  35 #include <linux/workqueue.h>
  36 #include "../pci.h"
  37 #include "pciehp.h"
  38
  39 static void interrupt_event_handler(struct work_struct *work);
  40
  41 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  42 {
  43         struct event_info *info;
  44
  45         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  46         if (!info)
  47                 return -ENOMEM;
  48
  49         info->event_type = event_type;
  50         info->p_slot = p_slot;
  51         INIT_WORK(&info->work, interrupt_event_handler);
  52
  53         schedule_work(&info->work);
  54
  55         return 0;
  56 }
  57
  58 u8 pciehp_handle_attention_button(struct slot *p_slot)
  59 {
  60         u32 event_type;
  61         struct controller *ctrl = p_slot->ctrl;
  62
  63         /* Attention Button Change */
  64         ctrl_dbg(ctrl, "Attention button interrupt received\n");
  65
  66         /*
  67          *  Button pressed - See if need to TAKE ACTION!!!
  68          */
  69         ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
  70         event_type = INT_BUTTON_PRESS;
  71
  72         queue_interrupt_event(p_slot, event_type);
  73
  74         return 0;
  75 }
  76
  77 u8 pciehp_handle_switch_change(struct slot *p_slot)
  78 {
  79         u8 getstatus;
  80         u32 event_type;
  81         struct controller *ctrl = p_slot->ctrl;
  82
  83         /* Switch Change */
  84         ctrl_dbg(ctrl, "Switch interrupt received\n");
  85
  86         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  87         if (getstatus) {
  88                 /*
  89                  * Switch opened
  90                  */
  91                 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
  92                 event_type = INT_SWITCH_OPEN;
  93         } else {
  94                 /*
  95                  *  Switch closed
  96                  */
  97                 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
  98                 event_type = INT_SWITCH_CLOSE;
  99         }
 100
 101         queue_interrupt_event(p_slot, event_type);
 102
 103         return 1;
 104 }
 105
 106 u8 pciehp_handle_presence_change(struct slot *p_slot)
 107 {
 108         u32 event_type;
 109         u8 presence_save;
 110         struct controller *ctrl = p_slot->ctrl;
 111
 112         /* Presence Change */
 113         ctrl_dbg(ctrl, "Presence/Notify input change\n");
 114
 115         /* Switch is open, assume a presence change
 116          * Save the presence state
 117          */
 118         p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 119         if (presence_save) {
 120                 /*
 121                  * Card Present
 122                  */
 123                 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
 124                 event_type = INT_PRESENCE_ON;
 125         } else {
 126                 /*
 127                  * Not Present
 128                  */
 129                 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
 130                           slot_name(p_slot));
 131                 event_type = INT_PRESENCE_OFF;
 132         }
 133
 134         queue_interrupt_event(p_slot, event_type);
 135
 136         return 1;
 137 }
 138
 139 u8 pciehp_handle_power_fault(struct slot *p_slot)
 140 {
 141         u32 event_type;
 142         struct controller *ctrl = p_slot->ctrl;
 143
 144         /* power fault */
 145         ctrl_dbg(ctrl, "Power fault interrupt received\n");
 146
 147         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 148                 /*
 149                  * power fault Cleared
 150                  */
 151                 ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
 152                           slot_name(p_slot));
 153                 event_type = INT_POWER_FAULT_CLEAR;
 154         } else {
 155                 /*
 156                  *   power fault
 157                  */
 158                 ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
 159                 event_type = INT_POWER_FAULT;
 160                 ctrl_info(ctrl, "Power fault bit %x set\n", 0);
 161         }
 162
 163         queue_interrupt_event(p_slot, event_type);
 164
 165         return 1;
 166 }
 167
 168 /* The following routines constitute the bulk of the
 169    hotplug controller logic
 170  */
 171
 172 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 173 {
 174         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 175         if (POWER_CTRL(ctrl)) {
 176                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 177                         ctrl_err(ctrl,
 178                                  "Issue of Slot Power Off command failed\n");
 179                         return;
 180                 }
 181         }
 182
 183         /*
 184          * After turning power off, we must wait for at least 1 second
 185          * before taking any action that relies on power having been
 186          * removed from the slot/adapter.
 187          */
 188         msleep(1000);
 189
 190         if (PWR_LED(ctrl))
 191                 pslot->hpc_ops->green_led_off(pslot);
 192
 193         if (ATTN_LED(ctrl)) {
 194                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 195                         ctrl_err(ctrl,
 196                                  "Issue of Set Attention Led command failed\n");
 197                         return;
 198                 }
 199         }
 200 }
 201
 202 /**
 203  * board_added - Called after a board has been added to the system.
 204  * @p_slot: &slot where board is added
 205  *
 206  * Turns power on for the board.
 207  * Configures board.
 208  */
 209 static int board_added(struct slot *p_slot)
 210 {
 211         int retval = 0;
 212         struct controller *ctrl = p_slot->ctrl;
 213         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 214
 215         ctrl_dbg(ctrl, "%s: slot device, slot offset, hp slot = %d, %d, %d\n",
 216                  __func__, p_slot->device, ctrl->slot_device_offset,
 217                  p_slot->hp_slot);
 218
 219         if (POWER_CTRL(ctrl)) {
 220                 /* Power on slot */
 221                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 222                 if (retval)
 223                         return retval;
 224         }
 225
 226         if (PWR_LED(ctrl))
 227                 p_slot->hpc_ops->green_led_blink(p_slot);
 228
 229         /* Check link training status */
 230         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 231         if (retval) {
 232                 ctrl_err(ctrl, "Failed to check link status\n");
 233                 set_slot_off(ctrl, p_slot);
 234                 return retval;
 235         }
 236
 237         /* Check for a power fault */
 238         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 239                 ctrl_dbg(ctrl, "Power fault detected\n");
 240                 retval = POWER_FAILURE;
 241                 goto err_exit;
 242         }
 243
 244         retval = pciehp_configure_device(p_slot);
 245         if (retval) {
 246                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 247                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 248                 goto err_exit;
 249         }
 250
 251         /*
 252          * Some PCI Express root ports require fixup after hot-plug operation.
 253          */
 254         if (pcie_mch_quirk)
 255                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 256         if (PWR_LED(ctrl))
 257                 p_slot->hpc_ops->green_led_on(p_slot);
 258
 259         return 0;
 260
 261 err_exit:
 262         set_slot_off(ctrl, p_slot);
 263         return retval;
 264 }
 265
 266 /**
 267  * remove_board - Turns off slot and LEDs
 268  * @p_slot: slot where board is being removed
 269  */
 270 static int remove_board(struct slot *p_slot)
 271 {
 272         int retval = 0;
 273         struct controller *ctrl = p_slot->ctrl;
 274
 275         retval = pciehp_unconfigure_device(p_slot);
 276         if (retval)
 277                 return retval;
 278
 279         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, p_slot->hp_slot);
 280
 281         if (POWER_CTRL(ctrl)) {
 282                 /* power off slot */
 283                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 284                 if (retval) {
 285                         ctrl_err(ctrl,
 286                                  "Issue of Slot Disable command failed\n");
 287                         return retval;
 288                 }
 289         }
 290
 291         /*
 292          * After turning power off, we must wait for at least 1 second
 293          * before taking any action that relies on power having been
 294          * removed from the slot/adapter.
 295          */
 296         msleep(1000);
 297
 298         if (PWR_LED(ctrl))
 299                 /* turn off Green LED */
 300                 p_slot->hpc_ops->green_led_off(p_slot);
 301
 302         return 0;
 303 }
 304
 305 struct power_work_info {
 306         struct slot *p_slot;
 307         struct work_struct work;
 308 };
 309
 310 /**
 311  * pciehp_power_thread - handle pushbutton events
 312  * @work: &struct work_struct describing work to be done
 313  *
 314  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 315  * Handles all pending events and exits.
 316  */
 317 static void pciehp_power_thread(struct work_struct *work)
 318 {
 319         struct power_work_info *info =
 320                 container_of(work, struct power_work_info, work);
 321         struct slot *p_slot = info->p_slot;
 322
 323         mutex_lock(&p_slot->lock);
 324         switch (p_slot->state) {
 325         case POWEROFF_STATE:
 326                 mutex_unlock(&p_slot->lock);
 327                 ctrl_dbg(p_slot->ctrl,
 328                          "Disabling domain:bus:device=%04x:%02x:%02x\n",
 329                          pci_domain_nr(p_slot->ctrl->pci_dev->subordinate),
 330                          p_slot->bus, p_slot->device);
 331                 pciehp_disable_slot(p_slot);
 332                 mutex_lock(&p_slot->lock);
 333                 p_slot->state = STATIC_STATE;
 334                 break;
 335         case POWERON_STATE:
 336                 mutex_unlock(&p_slot->lock);
 337                 if (pciehp_enable_slot(p_slot) &&
 338                     PWR_LED(p_slot->ctrl))
 339                         p_slot->hpc_ops->green_led_off(p_slot);
 340                 mutex_lock(&p_slot->lock);
 341                 p_slot->state = STATIC_STATE;
 342                 break;
 343         default:
 344                 break;
 345         }
 346         mutex_unlock(&p_slot->lock);
 347
 348         kfree(info);
 349 }
 350
 351 void pciehp_queue_pushbutton_work(struct work_struct *work)
 352 {
 353         struct slot *p_slot = container_of(work, struct slot, work.work);
 354         struct power_work_info *info;
 355
 356         info = kmalloc(sizeof(*info), GFP_KERNEL);
 357         if (!info) {
 358                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 359                          __func__);
 360                 return;
 361         }
 362         info->p_slot = p_slot;
 363         INIT_WORK(&info->work, pciehp_power_thread);
 364
 365         mutex_lock(&p_slot->lock);
 366         switch (p_slot->state) {
 367         case BLINKINGOFF_STATE:
 368                 p_slot->state = POWEROFF_STATE;
 369                 break;
 370         case BLINKINGON_STATE:
 371                 p_slot->state = POWERON_STATE;
 372                 break;
 373         default:
 374                 goto out;
 375         }
 376         queue_work(pciehp_wq, &info->work);
 377  out:
 378         mutex_unlock(&p_slot->lock);
 379 }
 380
 381 static int update_slot_info(struct slot *slot)
 382 {
 383         struct hotplug_slot_info *info;
 384         int result;
 385
 386         info = kmalloc(sizeof(*info), GFP_KERNEL);
 387         if (!info)
 388                 return -ENOMEM;
 389
 390         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 391         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 392         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 393         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 394
 395         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 396         kfree (info);
 397         return result;
 398 }
 399
 400 /*
 401  * Note: This function must be called with slot->lock held
 402  */
 403 static void handle_button_press_event(struct slot *p_slot)
 404 {
 405         struct controller *ctrl = p_slot->ctrl;
 406         u8 getstatus;
 407
 408         switch (p_slot->state) {
 409         case STATIC_STATE:
 410                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 411                 if (getstatus) {
 412                         p_slot->state = BLINKINGOFF_STATE;
 413                         ctrl_info(ctrl,
 414                                   "PCI slot #%s - powering off due to button "
 415                                   "press.\n", slot_name(p_slot));
 416                 } else {
 417                         p_slot->state = BLINKINGON_STATE;
 418                         ctrl_info(ctrl,
 419                                   "PCI slot #%s - powering on due to button "
 420                                   "press.\n", slot_name(p_slot));
 421                 }
 422                 /* blink green LED and turn off amber */
 423                 if (PWR_LED(ctrl))
 424                         p_slot->hpc_ops->green_led_blink(p_slot);
 425                 if (ATTN_LED(ctrl))
 426                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 427
 428                 schedule_delayed_work(&p_slot->work, 5*HZ);
 429                 break;
 430         case BLINKINGOFF_STATE:
 431         case BLINKINGON_STATE:
 432                 /*
 433                  * Cancel if we are still blinking; this means that we
 434                  * press the attention again before the 5 sec. limit
 435                  * expires to cancel hot-add or hot-remove
 436                  */
 437                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 438                 cancel_delayed_work(&p_slot->work);
 439                 if (p_slot->state == BLINKINGOFF_STATE) {
 440                         if (PWR_LED(ctrl))
 441                                 p_slot->hpc_ops->green_led_on(p_slot);
 442                 } else {
 443                         if (PWR_LED(ctrl))
 444                                 p_slot->hpc_ops->green_led_off(p_slot);
 445                 }
 446                 if (ATTN_LED(ctrl))
 447                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 448                 ctrl_info(ctrl, "PCI slot #%s - action canceled "
 449                           "due to button press\n", slot_name(p_slot));
 450                 p_slot->state = STATIC_STATE;
 451                 break;
 452         case POWEROFF_STATE:
 453         case POWERON_STATE:
 454                 /*
 455                  * Ignore if the slot is on power-on or power-off state;
 456                  * this means that the previous attention button action
 457                  * to hot-add or hot-remove is undergoing
 458                  */
 459                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
 460                 update_slot_info(p_slot);
 461                 break;
 462         default:
 463                 ctrl_warn(ctrl, "Not a valid state\n");
 464                 break;
 465         }
 466 }
 467
 468 /*
 469  * Note: This function must be called with slot->lock held
 470  */
 471 static void handle_surprise_event(struct slot *p_slot)
 472 {
 473         u8 getstatus;
 474         struct power_work_info *info;
 475
 476         info = kmalloc(sizeof(*info), GFP_KERNEL);
 477         if (!info) {
 478                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 479                          __func__);
 480                 return;
 481         }
 482         info->p_slot = p_slot;
 483         INIT_WORK(&info->work, pciehp_power_thread);
 484
 485         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 486         if (!getstatus)
 487                 p_slot->state = POWEROFF_STATE;
 488         else
 489                 p_slot->state = POWERON_STATE;
 490
 491         queue_work(pciehp_wq, &info->work);
 492 }
 493
 494 static void interrupt_event_handler(struct work_struct *work)
 495 {
 496         struct event_info *info = container_of(work, struct event_info, work);
 497         struct slot *p_slot = info->p_slot;
 498         struct controller *ctrl = p_slot->ctrl;
 499
 500         mutex_lock(&p_slot->lock);
 501         switch (info->event_type) {
 502         case INT_BUTTON_PRESS:
 503                 handle_button_press_event(p_slot);
 504                 break;
 505         case INT_POWER_FAULT:
 506                 if (!POWER_CTRL(ctrl))
 507                         break;
 508                 if (ATTN_LED(ctrl))
 509                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 510                 if (PWR_LED(ctrl))
 511                         p_slot->hpc_ops->green_led_off(p_slot);
 512                 break;
 513         case INT_PRESENCE_ON:
 514         case INT_PRESENCE_OFF:
 515                 if (!HP_SUPR_RM(ctrl))
 516                         break;
 517                 ctrl_dbg(ctrl, "Surprise Removal\n");
 518                 update_slot_info(p_slot);
 519                 handle_surprise_event(p_slot);
 520                 break;
 521         default:
 522                 update_slot_info(p_slot);
 523                 break;
 524         }
 525         mutex_unlock(&p_slot->lock);
 526
 527         kfree(info);
 528 }
 529
 530 int pciehp_enable_slot(struct slot *p_slot)
 531 {
 532         u8 getstatus = 0;
 533         int rc;
 534         struct controller *ctrl = p_slot->ctrl;
 535
 536         /* Check to see if (latch closed, card present, power off) */
 537         mutex_lock(&p_slot->ctrl->crit_sect);
 538
 539         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 540         if (rc || !getstatus) {
 541                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 542                 mutex_unlock(&p_slot->ctrl->crit_sect);
 543                 return -ENODEV;
 544         }
 545         if (MRL_SENS(p_slot->ctrl)) {
 546                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 547                 if (rc || getstatus) {
 548                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 549                                   slot_name(p_slot));
 550                         mutex_unlock(&p_slot->ctrl->crit_sect);
 551                         return -ENODEV;
 552                 }
 553         }
 554
 555         if (POWER_CTRL(p_slot->ctrl)) {
 556                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 557                 if (rc || getstatus) {
 558                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 559                                   slot_name(p_slot));
 560                         mutex_unlock(&p_slot->ctrl->crit_sect);
 561                         return -EINVAL;
 562                 }
 563         }
 564
 565         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 566
 567         rc = board_added(p_slot);
 568         if (rc) {
 569                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 570         }
 571
 572         update_slot_info(p_slot);
 573
 574         mutex_unlock(&p_slot->ctrl->crit_sect);
 575         return rc;
 576 }
 577
 578
 579 int pciehp_disable_slot(struct slot *p_slot)
 580 {
 581         u8 getstatus = 0;
 582         int ret = 0;
 583         struct controller *ctrl = p_slot->ctrl;
 584
 585         if (!p_slot->ctrl)
 586                 return 1;
 587
 588         /* Check to see if (latch closed, card present, power on) */
 589         mutex_lock(&p_slot->ctrl->crit_sect);
 590
 591         if (!HP_SUPR_RM(p_slot->ctrl)) {
 592                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 593                 if (ret || !getstatus) {
 594                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
 595                                   slot_name(p_slot));
 596                         mutex_unlock(&p_slot->ctrl->crit_sect);
 597                         return -ENODEV;
 598                 }
 599         }
 600
 601         if (MRL_SENS(p_slot->ctrl)) {
 602                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 603                 if (ret || getstatus) {
 604                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 605                                   slot_name(p_slot));
 606                         mutex_unlock(&p_slot->ctrl->crit_sect);
 607                         return -ENODEV;
 608                 }
 609         }
 610
 611         if (POWER_CTRL(p_slot->ctrl)) {
 612                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 613                 if (ret || !getstatus) {
 614                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 615                                   slot_name(p_slot));
 616                         mutex_unlock(&p_slot->ctrl->crit_sect);
 617                         return -EINVAL;
 618                 }
 619         }
 620
 621         ret = remove_board(p_slot);
 622         update_slot_info(p_slot);
 623
 624         mutex_unlock(&p_slot->ctrl->crit_sect);
 625         return ret;
 626 }
 627
 628 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 629 {
 630         int retval = -ENODEV;
 631         struct controller *ctrl = p_slot->ctrl;
 632
 633         mutex_lock(&p_slot->lock);
 634         switch (p_slot->state) {
 635         case BLINKINGON_STATE:
 636                 cancel_delayed_work(&p_slot->work);
 637         case STATIC_STATE:
 638                 p_slot->state = POWERON_STATE;
 639                 mutex_unlock(&p_slot->lock);
 640                 retval = pciehp_enable_slot(p_slot);
 641                 mutex_lock(&p_slot->lock);
 642                 p_slot->state = STATIC_STATE;
 643                 break;
 644         case POWERON_STATE:
 645                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 646                           slot_name(p_slot));
 647                 break;
 648         case BLINKINGOFF_STATE:
 649         case POWEROFF_STATE:
 650                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 651                           slot_name(p_slot));
 652                 break;
 653         default:
 654                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 655                          slot_name(p_slot));
 656                 break;
 657         }
 658         mutex_unlock(&p_slot->lock);
 659
 660         return retval;
 661 }
 662
 663 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 664 {
 665         int retval = -ENODEV;
 666         struct controller *ctrl = p_slot->ctrl;
 667
 668         mutex_lock(&p_slot->lock);
 669         switch (p_slot->state) {
 670         case BLINKINGOFF_STATE:
 671                 cancel_delayed_work(&p_slot->work);
 672         case STATIC_STATE:
 673                 p_slot->state = POWEROFF_STATE;
 674                 mutex_unlock(&p_slot->lock);
 675                 retval = pciehp_disable_slot(p_slot);
 676                 mutex_lock(&p_slot->lock);
 677                 p_slot->state = STATIC_STATE;
 678                 break;
 679         case POWEROFF_STATE:
 680                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 681                           slot_name(p_slot));
 682                 break;
 683         case BLINKINGON_STATE:
 684         case POWERON_STATE:
 685                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 686                           slot_name(p_slot));
 687                 break;
 688         default:
 689                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 690                          slot_name(p_slot));
 691                 break;
 692         }
 693         mutex_unlock(&p_slot->lock);
 694
 695         return retval;
 696 }