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