kernel/2.6.29.6-aldebaran-rt/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                  * After turning power off, we must wait for at least 1 second
 183                  * before taking any action that relies on power having been
 184                  * removed from the slot/adapter.
 185                  */
 186                 msleep(1000);
 187         }
 188
 189         if (PWR_LED(ctrl))
 190                 pslot->hpc_ops->green_led_off(pslot);
 191
 192         if (ATTN_LED(ctrl)) {
 193                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 194                         ctrl_err(ctrl,
 195                                  "Issue of Set Attention Led command failed\n");
 196                         return;
 197                 }
 198         }
 199 }
 200
 201 /**
 202  * board_added - Called after a board has been added to the system.
 203  * @p_slot: &slot where board is added
 204  *
 205  * Turns power on for the board.
 206  * Configures board.
 207  */
 208 static int board_added(struct slot *p_slot)
 209 {
 210         int retval = 0;
 211         struct controller *ctrl = p_slot->ctrl;
 212         struct pci_bus *parent = ctrl->pci_dev->subordinate;
 213
 214         ctrl_dbg(ctrl, "%s: slot device, slot offset, hp slot = %d, %d, %d\n",
 215                  __func__, p_slot->device, ctrl->slot_device_offset,
 216                  p_slot->hp_slot);
 217
 218         if (POWER_CTRL(ctrl)) {
 219                 /* Power on slot */
 220                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 221                 if (retval)
 222                         return retval;
 223         }
 224
 225         if (PWR_LED(ctrl))
 226                 p_slot->hpc_ops->green_led_blink(p_slot);
 227
 228         /* Check link training status */
 229         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 230         if (retval) {
 231                 ctrl_err(ctrl, "Failed to check link status\n");
 232                 set_slot_off(ctrl, p_slot);
 233                 return retval;
 234         }
 235
 236         /* Check for a power fault */
 237         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 238                 ctrl_dbg(ctrl, "Power fault detected\n");
 239                 retval = POWER_FAILURE;
 240                 goto err_exit;
 241         }
 242
 243         retval = pciehp_configure_device(p_slot);
 244         if (retval) {
 245                 ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
 246                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
 247                 goto err_exit;
 248         }
 249
 250         /*
 251          * Some PCI Express root ports require fixup after hot-plug operation.
 252          */
 253         if (pcie_mch_quirk)
 254                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 255         if (PWR_LED(ctrl))
 256                 p_slot->hpc_ops->green_led_on(p_slot);
 257
 258         return 0;
 259
 260 err_exit:
 261         set_slot_off(ctrl, p_slot);
 262         return retval;
 263 }
 264
 265 /**
 266  * remove_board - Turns off slot and LEDs
 267  * @p_slot: slot where board is being removed
 268  */
 269 static int remove_board(struct slot *p_slot)
 270 {
 271         int retval = 0;
 272         struct controller *ctrl = p_slot->ctrl;
 273
 274         retval = pciehp_unconfigure_device(p_slot);
 275         if (retval)
 276                 return retval;
 277
 278         ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, p_slot->hp_slot);
 279
 280         if (POWER_CTRL(ctrl)) {
 281                 /* power off slot */
 282                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 283                 if (retval) {
 284                         ctrl_err(ctrl,
 285                                  "Issue of Slot Disable command failed\n");
 286                         return retval;
 287                 }
 288                 /*
 289                  * After turning power off, we must wait for at least 1 second
 290                  * before taking any action that relies on power having been
 291                  * removed from the slot/adapter.
 292                  */
 293                 msleep(1000);
 294         }
 295
 296         if (PWR_LED(ctrl))
 297                 /* turn off Green LED */
 298                 p_slot->hpc_ops->green_led_off(p_slot);
 299
 300         return 0;
 301 }
 302
 303 struct power_work_info {
 304         struct slot *p_slot;
 305         struct work_struct work;
 306 };
 307
 308 /**
 309  * pciehp_power_thread - handle pushbutton events
 310  * @work: &struct work_struct describing work to be done
 311  *
 312  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 313  * Handles all pending events and exits.
 314  */
 315 static void pciehp_power_thread(struct work_struct *work)
 316 {
 317         struct power_work_info *info =
 318                 container_of(work, struct power_work_info, work);
 319         struct slot *p_slot = info->p_slot;
 320
 321         mutex_lock(&p_slot->lock);
 322         switch (p_slot->state) {
 323         case POWEROFF_STATE:
 324                 mutex_unlock(&p_slot->lock);
 325                 ctrl_dbg(p_slot->ctrl,
 326                          "Disabling domain:bus:device=%04x:%02x:%02x\n",
 327                          pci_domain_nr(p_slot->ctrl->pci_dev->subordinate),
 328                          p_slot->bus, p_slot->device);
 329                 pciehp_disable_slot(p_slot);
 330                 mutex_lock(&p_slot->lock);
 331                 p_slot->state = STATIC_STATE;
 332                 break;
 333         case POWERON_STATE:
 334                 mutex_unlock(&p_slot->lock);
 335                 if (pciehp_enable_slot(p_slot) &&
 336                     PWR_LED(p_slot->ctrl))
 337                         p_slot->hpc_ops->green_led_off(p_slot);
 338                 mutex_lock(&p_slot->lock);
 339                 p_slot->state = STATIC_STATE;
 340                 break;
 341         default:
 342                 break;
 343         }
 344         mutex_unlock(&p_slot->lock);
 345
 346         kfree(info);
 347 }
 348
 349 void pciehp_queue_pushbutton_work(struct work_struct *work)
 350 {
 351         struct slot *p_slot = container_of(work, struct slot, work.work);
 352         struct power_work_info *info;
 353
 354         info = kmalloc(sizeof(*info), GFP_KERNEL);
 355         if (!info) {
 356                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 357                          __func__);
 358                 return;
 359         }
 360         info->p_slot = p_slot;
 361         INIT_WORK(&info->work, pciehp_power_thread);
 362
 363         mutex_lock(&p_slot->lock);
 364         switch (p_slot->state) {
 365         case BLINKINGOFF_STATE:
 366                 p_slot->state = POWEROFF_STATE;
 367                 break;
 368         case BLINKINGON_STATE:
 369                 p_slot->state = POWERON_STATE;
 370                 break;
 371         default:
 372                 goto out;
 373         }
 374         queue_work(pciehp_wq, &info->work);
 375  out:
 376         mutex_unlock(&p_slot->lock);
 377 }
 378
 379 static int update_slot_info(struct slot *slot)
 380 {
 381         struct hotplug_slot_info *info;
 382         int result;
 383
 384         info = kmalloc(sizeof(*info), GFP_KERNEL);
 385         if (!info)
 386                 return -ENOMEM;
 387
 388         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 389         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 390         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 391         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 392
 393         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 394         kfree (info);
 395         return result;
 396 }
 397
 398 /*
 399  * Note: This function must be called with slot->lock held
 400  */
 401 static void handle_button_press_event(struct slot *p_slot)
 402 {
 403         struct controller *ctrl = p_slot->ctrl;
 404         u8 getstatus;
 405
 406         switch (p_slot->state) {
 407         case STATIC_STATE:
 408                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 409                 if (getstatus) {
 410                         p_slot->state = BLINKINGOFF_STATE;
 411                         ctrl_info(ctrl,
 412                                   "PCI slot #%s - powering off due to button "
 413                                   "press.\n", slot_name(p_slot));
 414                 } else {
 415                         p_slot->state = BLINKINGON_STATE;
 416                         ctrl_info(ctrl,
 417                                   "PCI slot #%s - powering on due to button "
 418                                   "press.\n", slot_name(p_slot));
 419                 }
 420                 /* blink green LED and turn off amber */
 421                 if (PWR_LED(ctrl))
 422                         p_slot->hpc_ops->green_led_blink(p_slot);
 423                 if (ATTN_LED(ctrl))
 424                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 425
 426                 schedule_delayed_work(&p_slot->work, 5*HZ);
 427                 break;
 428         case BLINKINGOFF_STATE:
 429         case BLINKINGON_STATE:
 430                 /*
 431                  * Cancel if we are still blinking; this means that we
 432                  * press the attention again before the 5 sec. limit
 433                  * expires to cancel hot-add or hot-remove
 434                  */
 435                 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
 436                 cancel_delayed_work(&p_slot->work);
 437                 if (p_slot->state == BLINKINGOFF_STATE) {
 438                         if (PWR_LED(ctrl))
 439                                 p_slot->hpc_ops->green_led_on(p_slot);
 440                 } else {
 441                         if (PWR_LED(ctrl))
 442                                 p_slot->hpc_ops->green_led_off(p_slot);
 443                 }
 444                 if (ATTN_LED(ctrl))
 445                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 446                 ctrl_info(ctrl, "PCI slot #%s - action canceled "
 447                           "due to button press\n", slot_name(p_slot));
 448                 p_slot->state = STATIC_STATE;
 449                 break;
 450         case POWEROFF_STATE:
 451         case POWERON_STATE:
 452                 /*
 453                  * Ignore if the slot is on power-on or power-off state;
 454                  * this means that the previous attention button action
 455                  * to hot-add or hot-remove is undergoing
 456                  */
 457                 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
 458                 update_slot_info(p_slot);
 459                 break;
 460         default:
 461                 ctrl_warn(ctrl, "Not a valid state\n");
 462                 break;
 463         }
 464 }
 465
 466 /*
 467  * Note: This function must be called with slot->lock held
 468  */
 469 static void handle_surprise_event(struct slot *p_slot)
 470 {
 471         u8 getstatus;
 472         struct power_work_info *info;
 473
 474         info = kmalloc(sizeof(*info), GFP_KERNEL);
 475         if (!info) {
 476                 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
 477                          __func__);
 478                 return;
 479         }
 480         info->p_slot = p_slot;
 481         INIT_WORK(&info->work, pciehp_power_thread);
 482
 483         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 484         if (!getstatus)
 485                 p_slot->state = POWEROFF_STATE;
 486         else
 487                 p_slot->state = POWERON_STATE;
 488
 489         queue_work(pciehp_wq, &info->work);
 490 }
 491
 492 static void interrupt_event_handler(struct work_struct *work)
 493 {
 494         struct event_info *info = container_of(work, struct event_info, work);
 495         struct slot *p_slot = info->p_slot;
 496         struct controller *ctrl = p_slot->ctrl;
 497
 498         mutex_lock(&p_slot->lock);
 499         switch (info->event_type) {
 500         case INT_BUTTON_PRESS:
 501                 handle_button_press_event(p_slot);
 502                 break;
 503         case INT_POWER_FAULT:
 504                 if (!POWER_CTRL(ctrl))
 505                         break;
 506                 if (ATTN_LED(ctrl))
 507                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 508                 if (PWR_LED(ctrl))
 509                         p_slot->hpc_ops->green_led_off(p_slot);
 510                 break;
 511         case INT_PRESENCE_ON:
 512         case INT_PRESENCE_OFF:
 513                 if (!HP_SUPR_RM(ctrl))
 514                         break;
 515                 ctrl_dbg(ctrl, "Surprise Removal\n");
 516                 update_slot_info(p_slot);
 517                 handle_surprise_event(p_slot);
 518                 break;
 519         default:
 520                 update_slot_info(p_slot);
 521                 break;
 522         }
 523         mutex_unlock(&p_slot->lock);
 524
 525         kfree(info);
 526 }
 527
 528 int pciehp_enable_slot(struct slot *p_slot)
 529 {
 530         u8 getstatus = 0;
 531         int rc;
 532         struct controller *ctrl = p_slot->ctrl;
 533
 534         /* Check to see if (latch closed, card present, power off) */
 535         mutex_lock(&p_slot->ctrl->crit_sect);
 536
 537         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 538         if (rc || !getstatus) {
 539                 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
 540                 mutex_unlock(&p_slot->ctrl->crit_sect);
 541                 return -ENODEV;
 542         }
 543         if (MRL_SENS(p_slot->ctrl)) {
 544                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 545                 if (rc || getstatus) {
 546                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 547                                   slot_name(p_slot));
 548                         mutex_unlock(&p_slot->ctrl->crit_sect);
 549                         return -ENODEV;
 550                 }
 551         }
 552
 553         if (POWER_CTRL(p_slot->ctrl)) {
 554                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 555                 if (rc || getstatus) {
 556                         ctrl_info(ctrl, "Already enabled on slot(%s)\n",
 557                                   slot_name(p_slot));
 558                         mutex_unlock(&p_slot->ctrl->crit_sect);
 559                         return -EINVAL;
 560                 }
 561         }
 562
 563         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 564
 565         rc = board_added(p_slot);
 566         if (rc) {
 567                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 568         }
 569
 570         update_slot_info(p_slot);
 571
 572         mutex_unlock(&p_slot->ctrl->crit_sect);
 573         return rc;
 574 }
 575
 576
 577 int pciehp_disable_slot(struct slot *p_slot)
 578 {
 579         u8 getstatus = 0;
 580         int ret = 0;
 581         struct controller *ctrl = p_slot->ctrl;
 582
 583         if (!p_slot->ctrl)
 584                 return 1;
 585
 586         /* Check to see if (latch closed, card present, power on) */
 587         mutex_lock(&p_slot->ctrl->crit_sect);
 588
 589         if (!HP_SUPR_RM(p_slot->ctrl)) {
 590                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 591                 if (ret || !getstatus) {
 592                         ctrl_info(ctrl, "No adapter on slot(%s)\n",
 593                                   slot_name(p_slot));
 594                         mutex_unlock(&p_slot->ctrl->crit_sect);
 595                         return -ENODEV;
 596                 }
 597         }
 598
 599         if (MRL_SENS(p_slot->ctrl)) {
 600                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 601                 if (ret || getstatus) {
 602                         ctrl_info(ctrl, "Latch open on slot(%s)\n",
 603                                   slot_name(p_slot));
 604                         mutex_unlock(&p_slot->ctrl->crit_sect);
 605                         return -ENODEV;
 606                 }
 607         }
 608
 609         if (POWER_CTRL(p_slot->ctrl)) {
 610                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 611                 if (ret || !getstatus) {
 612                         ctrl_info(ctrl, "Already disabled on slot(%s)\n",
 613                                   slot_name(p_slot));
 614                         mutex_unlock(&p_slot->ctrl->crit_sect);
 615                         return -EINVAL;
 616                 }
 617         }
 618
 619         ret = remove_board(p_slot);
 620         update_slot_info(p_slot);
 621
 622         mutex_unlock(&p_slot->ctrl->crit_sect);
 623         return ret;
 624 }
 625
 626 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 627 {
 628         int retval = -ENODEV;
 629         struct controller *ctrl = p_slot->ctrl;
 630
 631         mutex_lock(&p_slot->lock);
 632         switch (p_slot->state) {
 633         case BLINKINGON_STATE:
 634                 cancel_delayed_work(&p_slot->work);
 635         case STATIC_STATE:
 636                 p_slot->state = POWERON_STATE;
 637                 mutex_unlock(&p_slot->lock);
 638                 retval = pciehp_enable_slot(p_slot);
 639                 mutex_lock(&p_slot->lock);
 640                 p_slot->state = STATIC_STATE;
 641                 break;
 642         case POWERON_STATE:
 643                 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
 644                           slot_name(p_slot));
 645                 break;
 646         case BLINKINGOFF_STATE:
 647         case POWEROFF_STATE:
 648                 ctrl_info(ctrl, "Already enabled on slot %s\n",
 649                           slot_name(p_slot));
 650                 break;
 651         default:
 652                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 653                          slot_name(p_slot));
 654                 break;
 655         }
 656         mutex_unlock(&p_slot->lock);
 657
 658         return retval;
 659 }
 660
 661 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 662 {
 663         int retval = -ENODEV;
 664         struct controller *ctrl = p_slot->ctrl;
 665
 666         mutex_lock(&p_slot->lock);
 667         switch (p_slot->state) {
 668         case BLINKINGOFF_STATE:
 669                 cancel_delayed_work(&p_slot->work);
 670         case STATIC_STATE:
 671                 p_slot->state = POWEROFF_STATE;
 672                 mutex_unlock(&p_slot->lock);
 673                 retval = pciehp_disable_slot(p_slot);
 674                 mutex_lock(&p_slot->lock);
 675                 p_slot->state = STATIC_STATE;
 676                 break;
 677         case POWEROFF_STATE:
 678                 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
 679                           slot_name(p_slot));
 680                 break;
 681         case BLINKINGON_STATE:
 682         case POWERON_STATE:
 683                 ctrl_info(ctrl, "Already disabled on slot %s\n",
 684                           slot_name(p_slot));
 685                 break;
 686         default:
 687                 ctrl_err(ctrl, "Not a valid state on slot %s\n",
 688                          slot_name(p_slot));
 689                 break;
 690         }
 691         mutex_unlock(&p_slot->lock);
 692
 693         return retval;
 694 }