release/src-rt-6.x/linux/linux-2.6/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 }
 202
 203 /**
 204  * board_added - Called after a board has been added to the system.
 205  *
 206  * Turns power on for the board
 207  * Configures board
 208  *
 209  */
 210 static int board_added(struct slot *p_slot)
 211 {
 212         u8 hp_slot;
 213         int retval = 0;
 214         struct controller *ctrl = p_slot->ctrl;
 215
 216         hp_slot = p_slot->device - ctrl->slot_device_offset;
 217
 218         dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n",
 219                         __FUNCTION__, p_slot->device,
 220                         ctrl->slot_device_offset, hp_slot);
 221
 222         if (POWER_CTRL(ctrl->ctrlcap)) {
 223                 /* Power on slot */
 224                 retval = p_slot->hpc_ops->power_on_slot(p_slot);
 225                 if (retval)
 226                         return retval;
 227         }
 228
 229         if (PWR_LED(ctrl->ctrlcap))
 230                 p_slot->hpc_ops->green_led_blink(p_slot);
 231
 232         /* Wait for ~1 second */
 233         msleep(1000);
 234
 235         /* Check link training status */
 236         retval = p_slot->hpc_ops->check_lnk_status(ctrl);
 237         if (retval) {
 238                 err("%s: Failed to check link status\n", __FUNCTION__);
 239                 set_slot_off(ctrl, p_slot);
 240                 return retval;
 241         }
 242
 243         /* Check for a power fault */
 244         if (p_slot->hpc_ops->query_power_fault(p_slot)) {
 245                 dbg("%s: power fault detected\n", __FUNCTION__);
 246                 retval = POWER_FAILURE;
 247                 goto err_exit;
 248         }
 249
 250         retval = pciehp_configure_device(p_slot);
 251         if (retval) {
 252                 err("Cannot add device 0x%x:%x\n", p_slot->bus,
 253                     p_slot->device);
 254                 goto err_exit;
 255         }
 256
 257         /*
 258          * Some PCI Express root ports require fixup after hot-plug operation.
 259          */
 260         if (pcie_mch_quirk)
 261                 pci_fixup_device(pci_fixup_final, ctrl->pci_dev);
 262         if (PWR_LED(ctrl->ctrlcap))
 263                 p_slot->hpc_ops->green_led_on(p_slot);
 264
 265         return 0;
 266
 267 err_exit:
 268         set_slot_off(ctrl, p_slot);
 269         return retval;
 270 }
 271
 272 /**
 273  * remove_board - Turns off slot and LED's
 274  *
 275  */
 276 static int remove_board(struct slot *p_slot)
 277 {
 278         u8 device;
 279         u8 hp_slot;
 280         int retval = 0;
 281         struct controller *ctrl = p_slot->ctrl;
 282
 283         retval = pciehp_unconfigure_device(p_slot);
 284         if (retval)
 285                 return retval;
 286
 287         device = p_slot->device;
 288         hp_slot = p_slot->device - ctrl->slot_device_offset;
 289         p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
 290
 291         dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
 292
 293         if (POWER_CTRL(ctrl->ctrlcap)) {
 294                 /* power off slot */
 295                 retval = p_slot->hpc_ops->power_off_slot(p_slot);
 296                 if (retval) {
 297                         err("%s: Issue of Slot Disable command failed\n",
 298                             __FUNCTION__);
 299                         return retval;
 300                 }
 301         }
 302
 303         if (PWR_LED(ctrl->ctrlcap))
 304                 /* turn off Green LED */
 305                 p_slot->hpc_ops->green_led_off(p_slot);
 306
 307         return 0;
 308 }
 309
 310 struct power_work_info {
 311         struct slot *p_slot;
 312         struct work_struct work;
 313 };
 314
 315 /**
 316  * pciehp_pushbutton_thread
 317  *
 318  * Scheduled procedure to handle blocking stuff for the pushbuttons
 319  * Handles all pending events and exits.
 320  *
 321  */
 322 static void pciehp_power_thread(struct work_struct *work)
 323 {
 324         struct power_work_info *info =
 325                 container_of(work, struct power_work_info, work);
 326         struct slot *p_slot = info->p_slot;
 327
 328         mutex_lock(&p_slot->lock);
 329         switch (p_slot->state) {
 330         case POWEROFF_STATE:
 331                 mutex_unlock(&p_slot->lock);
 332                 dbg("%s: disabling bus:device(%x:%x)\n",
 333                     __FUNCTION__, p_slot->bus, p_slot->device);
 334                 pciehp_disable_slot(p_slot);
 335                 mutex_lock(&p_slot->lock);
 336                 p_slot->state = STATIC_STATE;
 337                 break;
 338         case POWERON_STATE:
 339                 mutex_unlock(&p_slot->lock);
 340                 if (pciehp_enable_slot(p_slot) &&
 341                     PWR_LED(p_slot->ctrl->ctrlcap))
 342                         p_slot->hpc_ops->green_led_off(p_slot);
 343                 mutex_lock(&p_slot->lock);
 344                 p_slot->state = STATIC_STATE;
 345                 break;
 346         default:
 347                 break;
 348         }
 349         mutex_unlock(&p_slot->lock);
 350
 351         kfree(info);
 352 }
 353
 354 void pciehp_queue_pushbutton_work(struct work_struct *work)
 355 {
 356         struct slot *p_slot = container_of(work, struct slot, work.work);
 357         struct power_work_info *info;
 358
 359         info = kmalloc(sizeof(*info), GFP_KERNEL);
 360         if (!info) {
 361                 err("%s: Cannot allocate memory\n", __FUNCTION__);
 362                 return;
 363         }
 364         info->p_slot = p_slot;
 365         INIT_WORK(&info->work, pciehp_power_thread);
 366
 367         mutex_lock(&p_slot->lock);
 368         switch (p_slot->state) {
 369         case BLINKINGOFF_STATE:
 370                 p_slot->state = POWEROFF_STATE;
 371                 break;
 372         case BLINKINGON_STATE:
 373                 p_slot->state = POWERON_STATE;
 374                 break;
 375         default:
 376                 goto out;
 377         }
 378         queue_work(pciehp_wq, &info->work);
 379  out:
 380         mutex_unlock(&p_slot->lock);
 381 }
 382
 383 static int update_slot_info(struct slot *slot)
 384 {
 385         struct hotplug_slot_info *info;
 386         int result;
 387
 388         info = kmalloc(sizeof(*info), GFP_KERNEL);
 389         if (!info)
 390                 return -ENOMEM;
 391
 392         slot->hpc_ops->get_power_status(slot, &(info->power_status));
 393         slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
 394         slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
 395         slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
 396
 397         result = pci_hp_change_slot_info(slot->hotplug_slot, info);
 398         kfree (info);
 399         return result;
 400 }
 401
 402 /*
 403  * Note: This function must be called with slot->lock held
 404  */
 405 static void handle_button_press_event(struct slot *p_slot)
 406 {
 407         struct controller *ctrl = p_slot->ctrl;
 408         u8 getstatus;
 409
 410         switch (p_slot->state) {
 411         case STATIC_STATE:
 412                 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 413                 if (getstatus) {
 414                         p_slot->state = BLINKINGOFF_STATE;
 415                         info("PCI slot #%s - powering off due to button "
 416                              "press.\n", p_slot->name);
 417                 } else {
 418                         p_slot->state = BLINKINGON_STATE;
 419                         info("PCI slot #%s - powering on due to button "
 420                              "press.\n", p_slot->name);
 421                 }
 422                 /* blink green LED and turn off amber */
 423                 if (PWR_LED(ctrl->ctrlcap))
 424                         p_slot->hpc_ops->green_led_blink(p_slot);
 425                 if (ATTN_LED(ctrl->ctrlcap))
 426                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 427
 428                 schedule_delayed_work(&p_slot->work, 5*HZ);
 429                 break;
 430         case BLINKINGOFF_STATE:
 431         case BLINKINGON_STATE:
 432                 /*
 433                  * Cancel if we are still blinking; this means that we
 434                  * press the attention again before the 5 sec. limit
 435                  * expires to cancel hot-add or hot-remove
 436                  */
 437                 info("Button cancel on Slot(%s)\n", p_slot->name);
 438                 dbg("%s: button cancel\n", __FUNCTION__);
 439                 cancel_delayed_work(&p_slot->work);
 440                 if (p_slot->state == BLINKINGOFF_STATE) {
 441                         if (PWR_LED(ctrl->ctrlcap))
 442                                 p_slot->hpc_ops->green_led_on(p_slot);
 443                 } else {
 444                         if (PWR_LED(ctrl->ctrlcap))
 445                                 p_slot->hpc_ops->green_led_off(p_slot);
 446                 }
 447                 if (ATTN_LED(ctrl->ctrlcap))
 448                         p_slot->hpc_ops->set_attention_status(p_slot, 0);
 449                 info("PCI slot #%s - action canceled due to button press\n",
 450                      p_slot->name);
 451                 p_slot->state = STATIC_STATE;
 452                 break;
 453         case POWEROFF_STATE:
 454         case POWERON_STATE:
 455                 /*
 456                  * Ignore if the slot is on power-on or power-off state;
 457                  * this means that the previous attention button action
 458                  * to hot-add or hot-remove is undergoing
 459                  */
 460                 info("Button ignore on Slot(%s)\n", p_slot->name);
 461                 update_slot_info(p_slot);
 462                 break;
 463         default:
 464                 warn("Not a valid state\n");
 465                 break;
 466         }
 467 }
 468
 469 /*
 470  * Note: This function must be called with slot->lock held
 471  */
 472 static void handle_surprise_event(struct slot *p_slot)
 473 {
 474         u8 getstatus;
 475         struct power_work_info *info;
 476
 477         info = kmalloc(sizeof(*info), GFP_KERNEL);
 478         if (!info) {
 479                 err("%s: Cannot allocate memory\n", __FUNCTION__);
 480                 return;
 481         }
 482         info->p_slot = p_slot;
 483         INIT_WORK(&info->work, pciehp_power_thread);
 484
 485         p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 486         if (!getstatus)
 487                 p_slot->state = POWEROFF_STATE;
 488         else
 489                 p_slot->state = POWERON_STATE;
 490
 491         queue_work(pciehp_wq, &info->work);
 492 }
 493
 494 static void interrupt_event_handler(struct work_struct *work)
 495 {
 496         struct event_info *info = container_of(work, struct event_info, work);
 497         struct slot *p_slot = info->p_slot;
 498         struct controller *ctrl = p_slot->ctrl;
 499
 500         mutex_lock(&p_slot->lock);
 501         switch (info->event_type) {
 502         case INT_BUTTON_PRESS:
 503                 handle_button_press_event(p_slot);
 504                 break;
 505         case INT_POWER_FAULT:
 506                 if (!POWER_CTRL(ctrl->ctrlcap))
 507                         break;
 508                 if (ATTN_LED(ctrl->ctrlcap))
 509                         p_slot->hpc_ops->set_attention_status(p_slot, 1);
 510                 if (PWR_LED(ctrl->ctrlcap))
 511                         p_slot->hpc_ops->green_led_off(p_slot);
 512                 break;
 513         case INT_PRESENCE_ON:
 514         case INT_PRESENCE_OFF:
 515                 if (!HP_SUPR_RM(ctrl->ctrlcap))
 516                         break;
 517                 dbg("Surprise Removal\n");
 518                 update_slot_info(p_slot);
 519                 handle_surprise_event(p_slot);
 520                 break;
 521         default:
 522                 update_slot_info(p_slot);
 523                 break;
 524         }
 525         mutex_unlock(&p_slot->lock);
 526
 527         kfree(info);
 528 }
 529
 530 int pciehp_enable_slot(struct slot *p_slot)
 531 {
 532         u8 getstatus = 0;
 533         int rc;
 534
 535         /* Check to see if (latch closed, card present, power off) */
 536         mutex_lock(&p_slot->ctrl->crit_sect);
 537
 538         rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 539         if (rc || !getstatus) {
 540                 info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 541                      p_slot->name);
 542                 mutex_unlock(&p_slot->ctrl->crit_sect);
 543                 return -ENODEV;
 544         }
 545         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 546                 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 547                 if (rc || getstatus) {
 548                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 549                              p_slot->name);
 550                         mutex_unlock(&p_slot->ctrl->crit_sect);
 551                         return -ENODEV;
 552                 }
 553         }
 554
 555         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 556                 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 557                 if (rc || getstatus) {
 558                         info("%s: already enabled on slot(%s)\n", __FUNCTION__,
 559                              p_slot->name);
 560                         mutex_unlock(&p_slot->ctrl->crit_sect);
 561                         return -EINVAL;
 562                 }
 563         }
 564
 565         p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 566
 567         rc = board_added(p_slot);
 568         if (rc) {
 569                 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 570         }
 571
 572         update_slot_info(p_slot);
 573
 574         mutex_unlock(&p_slot->ctrl->crit_sect);
 575         return rc;
 576 }
 577
 578
 579 int pciehp_disable_slot(struct slot *p_slot)
 580 {
 581         u8 getstatus = 0;
 582         int ret = 0;
 583
 584         if (!p_slot->ctrl)
 585                 return 1;
 586
 587         /* Check to see if (latch closed, card present, power on) */
 588         mutex_lock(&p_slot->ctrl->crit_sect);
 589
 590         if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) {
 591                 ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
 592                 if (ret || !getstatus) {
 593                         info("%s: no adapter on slot(%s)\n", __FUNCTION__,
 594                              p_slot->name);
 595                         mutex_unlock(&p_slot->ctrl->crit_sect);
 596                         return -ENODEV;
 597                 }
 598         }
 599
 600         if (MRL_SENS(p_slot->ctrl->ctrlcap)) {
 601                 ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
 602                 if (ret || getstatus) {
 603                         info("%s: latch open on slot(%s)\n", __FUNCTION__,
 604                              p_slot->name);
 605                         mutex_unlock(&p_slot->ctrl->crit_sect);
 606                         return -ENODEV;
 607                 }
 608         }
 609
 610         if (POWER_CTRL(p_slot->ctrl->ctrlcap)) {
 611                 ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
 612                 if (ret || !getstatus) {
 613                         info("%s: already disabled slot(%s)\n", __FUNCTION__,
 614                              p_slot->name);
 615                         mutex_unlock(&p_slot->ctrl->crit_sect);
 616                         return -EINVAL;
 617                 }
 618         }
 619
 620         ret = remove_board(p_slot);
 621         update_slot_info(p_slot);
 622
 623         mutex_unlock(&p_slot->ctrl->crit_sect);
 624         return ret;
 625 }
 626
 627 int pciehp_sysfs_enable_slot(struct slot *p_slot)
 628 {
 629         int retval = -ENODEV;
 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                 info("Slot %s is already in powering on state\n",
 644                      p_slot->name);
 645                 break;
 646         case BLINKINGOFF_STATE:
 647         case POWEROFF_STATE:
 648                 info("Already enabled on slot %s\n", p_slot->name);
 649                 break;
 650         default:
 651                 err("Not a valid state on slot %s\n", p_slot->name);
 652                 break;
 653         }
 654         mutex_unlock(&p_slot->lock);
 655
 656         return retval;
 657 }
 658
 659 int pciehp_sysfs_disable_slot(struct slot *p_slot)
 660 {
 661         int retval = -ENODEV;
 662
 663         mutex_lock(&p_slot->lock);
 664         switch (p_slot->state) {
 665         case BLINKINGOFF_STATE:
 666                 cancel_delayed_work(&p_slot->work);
 667         case STATIC_STATE:
 668                 p_slot->state = POWEROFF_STATE;
 669                 mutex_unlock(&p_slot->lock);
 670                 retval = pciehp_disable_slot(p_slot);
 671                 mutex_lock(&p_slot->lock);
 672                 p_slot->state = STATIC_STATE;
 673                 break;
 674         case POWEROFF_STATE:
 675                 info("Slot %s is already in powering off state\n",
 676                      p_slot->name);
 677                 break;
 678         case BLINKINGON_STATE:
 679         case POWERON_STATE:
 680                 info("Already disabled on slot %s\n", p_slot->name);
 681                 break;
 682         default:
 683                 err("Not a valid state on slot %s\n", p_slot->name);
 684                 break;
 685         }
 686         mutex_unlock(&p_slot->lock);
 687
 688         return retval;
 689 }