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