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 static int pciehp_enable_slot(struct slot *p_slot);
  41 static int pciehp_disable_slot(struct slot *p_slot);
  42
  43 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
  44 {
  45         struct event_info *info;
  46
  47         info = kmalloc(sizeof(*info), GFP_ATOMIC);
  48         if (!info)
  49                 return -ENOMEM;
  50
  51         info->event_type = event_type;
  52         info->p_slot = p_slot;
  53         INIT_WORK(&info->work, interrupt_event_handler);
  54
  55         schedule_work(&info->work);
  56
  57         return 0;
  58 }
  59
  60 u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
  61 {
  62         struct slot *p_slot;
  63         u32 event_type;
  64
  65         /* Attention Button Change */
  66         dbg("pciehp:  Attention button interrupt received.\n");
  67
  68         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  69
  70         /*
  71          *  Button pressed - See if need to TAKE ACTION!!!
  72          */
  73         info("Button pressed on Slot(%s)\n", p_slot->name);
  74         event_type = INT_BUTTON_PRESS;
  75
  76         queue_interrupt_event(p_slot, event_type);
  77
  78         return 0;
  79 }
  80
  81 u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
  82 {
  83         struct slot *p_slot;
  84         u8 getstatus;
  85         u32 event_type;
  86
  87         /* Switch Change */
  88         dbg("pciehp:  Switch interrupt received.\n");
  89
  90         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
  91         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
  92
  93         if (getstatus) {
  94                 /*
  95                  * Switch opened
  96                  */
  97                 info("Latch open on Slot(%s)\n", p_slot->name);
  98                 event_type = INT_SWITCH_OPEN;
  99         } else {
 100                 /*
 101                  *  Switch closed
 102                  */
 103                 info("Latch close on Slot(%s)\n", p_slot->name);
 104                 event_type = INT_SWITCH_CLOSE;
 105         }
 106
 107         queue_interrupt_event(p_slot, event_type);
 108
 109         return 1;
 110 }
 111
 112 u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
 113 {
 114         struct slot *p_slot;
 115         u32 event_type;
 116         u8 presence_save;
 117
 118         /* Presence Change */
 119         dbg("pciehp:  Presence/Notify input change.\n");
 120
 121         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 122
 123         /* Switch is open, assume a presence change
 124          * Save the presence state
 125          */
 126         p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save);
 127         if (presence_save) {
 128                 /*
 129                  * Card Present
 130                  */
 131                 info("Card present on Slot(%s)\n", p_slot->name);
 132                 event_type = INT_PRESENCE_ON;
 133         } else {
 134                 /*
 135                  * Not Present
 136                  */
 137                 info("Card not present on Slot(%s)\n", p_slot->name);
 138                 event_type = INT_PRESENCE_OFF;
 139         }
 140
 141         queue_interrupt_event(p_slot, event_type);
 142
 143         return 1;
 144 }
 145
 146 u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
 147 {
 148         struct slot *p_slot;
 149         u32 event_type;
 150
 151         /* power fault */
 152         dbg("pciehp:  Power fault interrupt received.\n");
 153
 154         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 155
 156         if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
 157                 /*
 158                  * power fault Cleared
 159                  */
 160                 info("Power fault cleared on Slot(%s)\n", p_slot->name);
 161                 event_type = INT_POWER_FAULT_CLEAR;
 162         } else {
 163                 /*
 164                  *   power fault
 165                  */
 166                 info("Power fault on Slot(%s)\n", p_slot->name);
 167                 event_type = INT_POWER_FAULT;
 168                 info("power fault bit %x set\n", hp_slot);
 169         }
 170
 171         queue_interrupt_event(p_slot, event_type);
 172
 173         return 1;
 174 }
 175
 176 /* The following routines constitute the bulk of the
 177    hotplug controller logic
 178  */
 179
 180 static void set_slot_off(struct controller *ctrl, struct slot * pslot)
 181 {
 182         /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
 183         if (POWER_CTRL(ctrl->ctrlcap)) {
 184                 if (pslot->hpc_ops->power_off_slot(pslot)) {
 185                         err("%s: Issue of Slot Power Off command failed\n",
 186                             __FUNCTION__);
 187                         return;
 188                 }
 189         }
 190
 191         if (PWR_LED(ctrl->ctrlcap))
 192                 pslot->hpc_ops->green_led_off(pslot);
 193
 194         if (ATTN_LED(ctrl->ctrlcap)) {
 195                 if (pslot->hpc_ops->set_attention_status(pslot, 1)) {
 196                         err("%s: Issue of Set Attention Led command failed\n",
 197                             __FUNCTION__);
 198                         return;
 199                 }
 200                 /*
 201                  * After turning power off, we must wait for at least
 202                  * 1 second before taking any action that relies on
 203                  * power having been removed from the slot/adapter.
 204                  */
 205                 msleep(1000);
 206         }
 207 }
 208
 209 /**
 210  * board_added - Called after a board has been added to the system.
 211  * @p_slot: &slot where board is added
 212  *
 213  * Turns power on for the board.
 214  * Configures board.
 215  */
 216 static int board_added(struct slot *p_slot)
 217 {
 218         u8 hp_slot;
 219         int retval = 0;
 220         struct controller *ctrl = p_slot->ctrl;
 221
 222         hp_slot = p_slot->device - ctrl->slot_device_offset;
 223
 224         dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
 225                         __FUNCTION__, p_slot->device,
 226                         ctrl->slot_device_offset, hp_slot);
 227
 228         if (POWER_CTRL(ctrl->ctrlcap)) {
 229                 /* Power on slot */
 230                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 231                 if (retval)
 232                         return retval;
 233         }
 234
 235         if (PWR_LED(ctrl->ctrlcap))
 236                 p_slot->hpc_ops->green_led_blink(p_slot);
 237
 238         /* Wait for ~1 second */
 239         msleep(1000);
 240
 241         /* Check link training status */
 242         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 243         if (retval) {
 244                 err("%s: Failed to check link status\n", __FUNCTION__);
 245                 set_slot_off(ctrl, p_slot);
 246                 return retval;
 247         }
 248
 249         /* Check for a power fault */
 250         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 251                 dbg("%s: power fault detected\n", __FUNCTION__);
 252                 retval = POWER_FAILURE;
 253                 goto err_exit;
 254         }
 255
 256         retval = pciehp_configure_device(p_slot);
 257         if (retval) {
 258                 err("Cannot add device 0x%x:%x\n", p_slot->bus,
 259                     p_slot->device);
 260                 goto err_exit;
 261         }
 262
 263         /*
 264          * Some PCI Express root ports require fixup after hot-plug operation.
 265          */
 266         if (pcie_mch_quirk)
 267                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 268         if (PWR_LED(ctrl->ctrlcap))
 269                 p_slot->hpc_ops->green_led_on(p_slot);
 270
 271         return 0;
 272
 273 err_exit:
 274         set_slot_off(ctrl, p_slot);
 275         return retval;
 276 }
 277
 278 /**
 279  * remove_board - Turns off slot and LEDs
 280  * @p_slot: slot where board is being removed
 281  */
 282 static int remove_board(struct slot *p_slot)
 283 {
 284         u8 device;
 285         u8 hp_slot;
 286         int retval = 0;
 287         struct controller *ctrl = p_slot->ctrl;
 288
 289         retval = pciehp_unconfigure_device(p_slot);
 290         if (retval)
 291                 return retval;
 292
 293         device = p_slot->device;
 294         hp_slot = p_slot->device - ctrl->slot_device_offset;
 295         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 296
 297         dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
 298
 299         if (POWER_CTRL(ctrl->ctrlcap)) {
 300                 /* power off slot */
 301                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 302                 if (retval) {
 303                         err("%s: Issue of Slot Disable command failed\n",
 304                             __FUNCTION__);
 305                         return retval;
 306                 }
 307         }
 308
 309         if (PWR_LED(ctrl->ctrlcap))
 310                 /* turn off Green LED */
 311                 p_slot->hpc_ops->green_led_off(p_slot);
 312
 313         return 0;
 314 }
 315
 316 struct power_work_info {
 317         struct slot *p_slot;
 318         struct work_struct work;
 319 };
 320
 321 /**
 322  * pciehp_power_thread - handle pushbutton events
 323  * @work: &struct work_struct describing work to be done
 324  *
 325  * Scheduled procedure to handle blocking stuff for the pushbuttons.
 326  * Handles all pending events and exits.
 327  */
 328 static void pciehp_power_thread(struct work_struct *work)
 329 {
 330         struct power_work_info *info =
 331                 container_of(work, struct power_work_info, work);
 332         struct slot *p_slot = info->p_slot;
 333
 334         mutex_lock(&p_slot->lock);
 335         switch (p_slot->state) {
 336         case POWEROFF_STATE:
 337                 mutex_unlock(&p_slot->lock);
 338                 dbg("%s: disabling bus:device(%x:%x)\n",
 339                     __FUNCTION__, p_slot->bus, p_slot->device);
 340                 pciehp_disable_slot(p_slot);
 341                 mutex_lock(&p_slot->lock);
 342                 p_slot->state = STATIC_STATE;
 343                 break;
 344         case POWERON_STATE:
 345                 mutex_unlock(&p_slot->lock);
 346                 if (pciehp_enable_slot(p_slot) &&
 347                     PWR_LED(p_slot->ctrl->ctrlcap))
 348                         p_slot->hpc_ops->green_led_off(p_slot);
 349                 mutex_lock(&p_slot->lock);
 350                 p_slot->state = STATIC_STATE;
 351                 break;
 352         default:
 353                 break;
 354         }
 355         mutex_unlock(&p_slot->lock);
 356
 357         kfree(info);
 358 }
 359
 360 void pciehp_queue_pushbutton_work(struct work_struct *work)
 361 {
 362         struct slot *p_slot = container_of(work, struct slot, work.work);
 363         struct power_work_info *info;
 364
 365         info = kmalloc(sizeof(*info), GFP_KERNEL);
 366         if (!info) {
 367                 err("%s: Cannot allocate memory\n", __FUNCTION__);
 368                 return;
 369         }
 370         info->p_slot = p_slot;
 371         INIT_WORK(&info->work, pciehp_power_thread);
 372
 373         mutex_lock(&p_slot->lock);
 374         switch (p_slot->state) {
 375         case BLINKINGOFF_STATE:
 376                 p_slot->state = POWEROFF_STATE;
 377                 break;
 378         case BLINKINGON_STATE:
 379                 p_slot->state = POWERON_STATE;
 380                 break;
 381         default:
 382                 goto out;
 383         }
 384         queue_work(pciehp_wq, &info->work);
 385  out:
 386         mutex_unlock(&p_slot->lock);
 387 }
 388
 389 static int update_slot_info(struct slot *slot)
 390 {
 391         struct hotplug_slot_info *info;
 392         int result;
 393
 394         info = kmalloc(sizeof(*info), GFP_KERNEL);
 395         if (!info)
 396                 return -ENOMEM;
 397
 398         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 399         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 400         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 401         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 402
 403         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 404         kfree (info);
 405         return result;
 406 }
 407
 408 /*
 409  * Note: This function must be called with slot->lock held
 410  */
 411 static void handle_button_press_event(struct slot *p_slot)
 412 {
 413         struct controller *ctrl = p_slot->ctrl;
 414         u8 getstatus;
 415
 416         switch (p_slot->state) {
 417         case STATIC_STATE:
 418                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 419                 if (getstatus) {
 420                         p_slot->state = BLINKINGOFF_STATE;
 421                         info("PCI slot #%s - powering off due to button "
 422                              "press.\n", p_slot->name);
 423                 } else {
 424                         p_slot->state = BLINKINGON_STATE;
 425                         info("PCI slot #%s - powering on due to button "
 426                              "press.\n", p_slot->name);
 427                 }
 428                 /* blink green LED and turn off amber */
 429                 if (PWR_LED(ctrl->ctrlcap))
 430                         p_slot->hpc_ops->green_led_blink(p_slot);
 431                 if (ATTN_LED(ctrl->ctrlcap))
 432                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 433
 434                 schedule_delayed_work(&p_slot->work, 5*HZ);
 435                 break;
 436         case BLINKINGOFF_STATE:
 437         case BLINKINGON_STATE:
 438                 /*
 439                  * Cancel if we are still blinking; this means that we
 440                  * press the attention again before the 5 sec. limit
 441                  * expires to cancel hot-add or hot-remove
 442                  */
 443                 info("Button cancel on Slot(%s)\n", p_slot->name);
 444                 dbg("%s: button cancel\n", __FUNCTION__);
 445                 cancel_delayed_work(&p_slot->work);
 446                 if (p_slot->state == BLINKINGOFF_STATE) {
 447                         if (PWR_LED(ctrl->ctrlcap))
 448                                 p_slot->hpc_ops->green_led_on(p_slot);
 449                 } else {
 450                         if (PWR_LED(ctrl->ctrlcap))
 451                                 p_slot->hpc_ops->green_led_off(p_slot);
 452                 }
 453                 if (ATTN_LED(ctrl->ctrlcap))
 454                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 455                 info("PCI slot #%s - action canceled due to button press\n",
 456                      p_slot->name);
 457                 p_slot->state = STATIC_STATE;
 458                 break;
 459         case POWEROFF_STATE:
 460         case POWERON_STATE:
 461                 /*
 462                  * Ignore if the slot is on power-on or power-off state;
 463                  * this means that the previous attention button action
 464                  * to hot-add or hot-remove is undergoing
 465                  */
 466                 info("Button ignore on Slot(%s)\n", p_slot->name);
 467                 update_slot_info(p_slot);
 468                 break;
 469         default:
 470                 warn("Not a valid state\n");
 471                 break;
 472         }
 473 }
 474
 475 /*
 476  * Note: This function must be called with slot->lock held
 477  */
 478 static void handle_surprise_event(struct slot *p_slot)
 479 {
 480         u8 getstatus;
 481         struct power_work_info *info;
 482
 483         info = kmalloc(sizeof(*info), GFP_KERNEL);
 484         if (!info) {
 485                 err("%s: Cannot allocate memory\n", __FUNCTION__);
 486                 return;
 487         }
 488         info->p_slot = p_slot;
 489         INIT_WORK(&info->work, pciehp_power_thread);
 490
 491         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 492         if (!getstatus)
 493                 p_slot->state = POWEROFF_STATE;
 494         else
 495                 p_slot->state = POWERON_STATE;
 496
 497         queue_work(pciehp_wq, &info->work);
 498 }
 499
 500 static void interrupt_event_handler(struct work_struct *work)
 501 {
 502         struct event_info *info = container_of(work, struct event_info, work);
 503         struct slot *p_slot = info->p_slot;
 504         struct controller *ctrl = p_slot->ctrl;
 505
 506         mutex_lock(&p_slot->lock);
 507         switch (info->event_type) {
 508         case INT_BUTTON_PRESS:
 509                 handle_button_press_event(p_slot);
 510                 break;
 511         case INT_POWER_FAULT:
 512                 if (!POWER_CTRL(ctrl->ctrlcap))
 513                         break;
 514                 if (ATTN_LED(ctrl->ctrlcap))
 515                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 516                 if (PWR_LED(ctrl->ctrlcap))
 517                         p_slot->hpc_ops->green_led_off(p_slot);
 518                 break;
 519         case INT_PRESENCE_ON:
 520         case INT_PRESENCE_OFF:
 521                 if (!HP_SUPR_RM(ctrl->ctrlcap))
 522                         break;
 523                 dbg("Surprise Removal\n");
 524                 update_slot_info(p_slot);
 525                 handle_surprise_event(p_slot);
 526                 break;
 527         default:
 528                 update_slot_info(p_slot);
 529                 break;
 530         }
 531         mutex_unlock(&p_slot->lock);
 532
 533         kfree(info);
 534 }
 535
 536 int pciehp_enable_slot(struct slot *p_slot)
 537 {
 538         u8 getstatus = 0;
 539         int rc;
 540
 541         /* Check to see if (latch closed, card present, power off) */
 542         mutex_lock(&p_slot->ctrl->crit_sect);
 543
 544         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 545         if (rc || !getstatus) {
 546                 info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 547                      p_slot->name);
 548                 mutex_unlock(&p_slot->ctrl->crit_sect);
 549                 return -ENODEV;
 550         }
 551         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 552                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 553                 if (rc || getstatus) {
 554                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 555                              p_slot->name);
 556                         mutex_unlock(&p_slot->ctrl->crit_sect);
 557                         return -ENODEV;
 558                 }
 559         }
 560
 561         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 562                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 563                 if (rc || getstatus) {
 564                         info("%s: already enabled on slot(%s)\n", __FUNCTION__,
 565                              p_slot->name);
 566                         mutex_unlock(&p_slot->ctrl->crit_sect);
 567                         return -EINVAL;
 568                 }
 569         }
 570
 571         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 572
 573         rc = board_added(p_slot);
 574         if (rc) {
 575                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 576         }
 577
 578         update_slot_info(p_slot);
 579
 580         mutex_unlock(&p_slot->ctrl->crit_sect);
 581         return rc;
 582 }
 583
 584
 585 int pciehp_disable_slot(struct slot *p_slot)
 586 {
 587         u8 getstatus = 0;
 588         int ret = 0;
 589
 590         if (!p_slot->ctrl)
 591                 return 1;
 592
 593         /* Check to see if (latch closed, card present, power on) */
 594         mutex_lock(&p_slot->ctrl->crit_sect);
 595
 596         if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
 597                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 598                 if (ret || !getstatus) {
 599                         info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 600                              p_slot->name);
 601                         mutex_unlock(&p_slot->ctrl->crit_sect);
 602                         return -ENODEV;
 603                 }
 604         }
 605
 606         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 607                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 608                 if (ret || getstatus) {
 609                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 610                              p_slot->name);
 611                         mutex_unlock(&p_slot->ctrl->crit_sect);
 612                         return -ENODEV;
 613                 }
 614         }
 615
 616         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 617                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 618                 if (ret || !getstatus) {
 619                         info("%s: already disabled slot(%s)\n", __FUNCTION__,
 620                              p_slot->name);
 621                         mutex_unlock(&p_slot->ctrl->crit_sect);
 622                         return -EINVAL;
 623                 }
 624                 /*
 625                  * After turning power off, we must wait for at least
 626                  * 1 second before taking any action that relies on
 627                  * power having been removed from the slot/adapter.
 628                  */
 629                 msleep(1000);
 630         }
 631
 632         ret = remove_board(p_slot);
 633         update_slot_info(p_slot);
 634
 635         mutex_unlock(&p_slot->ctrl->crit_sect);
 636         return ret;
 637 }
 638
 639 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 640 {
 641         int retval = -ENODEV;
 642
 643         mutex_lock(&p_slot->lock);
 644         switch (p_slot->state) {
 645         case BLINKINGON_STATE:
 646                 cancel_delayed_work(&p_slot->work);
 647         case STATIC_STATE:
 648                 p_slot->state = POWERON_STATE;
 649                 mutex_unlock(&p_slot->lock);
 650                 retval = pciehp_enable_slot(p_slot);
 651                 mutex_lock(&p_slot->lock);
 652                 p_slot->state = STATIC_STATE;
 653                 break;
 654         case POWERON_STATE:
 655                 info("Slot %s is already in powering on state\n",
 656                      p_slot->name);
 657                 break;
 658         case BLINKINGOFF_STATE:
 659         case POWEROFF_STATE:
 660                 info("Already enabled on slot %s\n", p_slot->name);
 661                 break;
 662         default:
 663                 err("Not a valid state on slot %s\n", p_slot->name);
 664                 break;
 665         }
 666         mutex_unlock(&p_slot->lock);
 667
 668         return retval;
 669 }
 670
 671 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 672 {
 673         int retval = -ENODEV;
 674
 675         mutex_lock(&p_slot->lock);
 676         switch (p_slot->state) {
 677         case BLINKINGOFF_STATE:
 678                 cancel_delayed_work(&p_slot->work);
 679         case STATIC_STATE:
 680                 p_slot->state = POWEROFF_STATE;
 681                 mutex_unlock(&p_slot->lock);
 682                 retval = pciehp_disable_slot(p_slot);
 683                 mutex_lock(&p_slot->lock);
 684                 p_slot->state = STATIC_STATE;
 685                 break;
 686         case POWEROFF_STATE:
 687                 info("Slot %s is already in powering off state\n",
 688                      p_slot->name);
 689                 break;
 690         case BLINKINGON_STATE:
 691         case POWERON_STATE:
 692                 info("Already disabled on slot %s\n", p_slot->name);
 693                 break;
 694         default:
 695                 err("Not a valid state on slot %s\n", p_slot->name);
 696                 break;
 697         }
 698         mutex_unlock(&p_slot->lock);
 699
 700         return retval;
 701 }