drivers/base/power/main.c

   1 /*
   2  * drivers/base/power/main.c - Where the driver meets power management.
   3  *
   4  * Copyright (c) 2003 Patrick Mochel
   5  * Copyright (c) 2003 Open Source Development Lab
   6  *
   7  * This file is released under the GPLv2
   8  *
   9  *
  10  * The driver model core calls device_pm_add() when a device is registered.
  11  * This will initialize the embedded device_pm_info object in the device
  12  * and add it to the list of power-controlled devices. sysfs entries for
  13  * controlling device power management will also be added.
  14  *
  15  * A separate list is used for keeping track of power info, because the power
  16  * domain dependencies may differ from the ancestral dependencies that the
  17  * subsystem list maintains.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/export.h>
  22 #include <linux/mutex.h>
  23 #include <linux/pm.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/pm-trace.h>
  26 #include <linux/pm_wakeirq.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/sched.h>
  29 #include <linux/sched/debug.h>
  30 #include <linux/async.h>
  31 #include <linux/suspend.h>
  32 #include <trace/events/power.h>
  33 #include <linux/cpufreq.h>
  34 #include <linux/cpuidle.h>
  35 #include <linux/timer.h>
  36
  37 #include "../base.h"
  38 #include "power.h"
  39
  40 typedef int (*pm_callback_t)(struct device *);
  41
  42 /*
  43  * The entries in the dpm_list list are in a depth first order, simply
  44  * because children are guaranteed to be discovered after parents, and
  45  * are inserted at the back of the list on discovery.
  46  *
  47  * Since device_pm_add() may be called with a device lock held,
  48  * we must never try to acquire a device lock while holding
  49  * dpm_list_mutex.
  50  */
  51
  52 LIST_HEAD(dpm_list);
  53 static LIST_HEAD(dpm_prepared_list);
  54 static LIST_HEAD(dpm_suspended_list);
  55 static LIST_HEAD(dpm_late_early_list);
  56 static LIST_HEAD(dpm_noirq_list);
  57
  58 struct suspend_stats suspend_stats;
  59 static DEFINE_MUTEX(dpm_list_mtx);
  60 static pm_message_t pm_transition;
  61
  62 static int async_error;
  63
  64 static const char *pm_verb(int event)
  65 {
  66         switch (event) {
  67         case PM_EVENT_SUSPEND:
  68                 return "suspend";
  69         case PM_EVENT_RESUME:
  70                 return "resume";
  71         case PM_EVENT_FREEZE:
  72                 return "freeze";
  73         case PM_EVENT_QUIESCE:
  74                 return "quiesce";
  75         case PM_EVENT_HIBERNATE:
  76                 return "hibernate";
  77         case PM_EVENT_THAW:
  78                 return "thaw";
  79         case PM_EVENT_RESTORE:
  80                 return "restore";
  81         case PM_EVENT_RECOVER:
  82                 return "recover";
  83         default:
  84                 return "(unknown PM event)";
  85         }
  86 }
  87
  88 /**
  89  * device_pm_sleep_init - Initialize system suspend-related device fields.
  90  * @dev: Device object being initialized.
  91  */
  92 void device_pm_sleep_init(struct device *dev)
  93 {
  94         dev->power.is_prepared = false;
  95         dev->power.is_suspended = false;
  96         dev->power.is_noirq_suspended = false;
  97         dev->power.is_late_suspended = false;
  98         init_completion(&dev->power.completion);
  99         complete_all(&dev->power.completion);
 100         dev->power.wakeup = NULL;
 101         INIT_LIST_HEAD(&dev->power.entry);
 102 }
 103
 104 /**
 105  * device_pm_lock - Lock the list of active devices used by the PM core.
 106  */
 107 void device_pm_lock(void)
 108 {
 109         mutex_lock(&dpm_list_mtx);
 110 }
 111
 112 /**
 113  * device_pm_unlock - Unlock the list of active devices used by the PM core.
 114  */
 115 void device_pm_unlock(void)
 116 {
 117         mutex_unlock(&dpm_list_mtx);
 118 }
 119
 120 /**
 121  * device_pm_add - Add a device to the PM core's list of active devices.
 122  * @dev: Device to add to the list.
 123  */
 124 void device_pm_add(struct device *dev)
 125 {
 126         pr_debug("PM: Adding info for %s:%s\n",
 127                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 128         device_pm_check_callbacks(dev);
 129         mutex_lock(&dpm_list_mtx);
 130         if (dev->parent && dev->parent->power.is_prepared)
 131                 dev_warn(dev, "parent %s should not be sleeping\n",
 132                         dev_name(dev->parent));
 133         list_add_tail(&dev->power.entry, &dpm_list);
 134         dev->power.in_dpm_list = true;
 135         mutex_unlock(&dpm_list_mtx);
 136 }
 137
 138 /**
 139  * device_pm_remove - Remove a device from the PM core's list of active devices.
 140  * @dev: Device to be removed from the list.
 141  */
 142 void device_pm_remove(struct device *dev)
 143 {
 144         pr_debug("PM: Removing info for %s:%s\n",
 145                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 146         complete_all(&dev->power.completion);
 147         mutex_lock(&dpm_list_mtx);
 148         list_del_init(&dev->power.entry);
 149         dev->power.in_dpm_list = false;
 150         mutex_unlock(&dpm_list_mtx);
 151         device_wakeup_disable(dev);
 152         pm_runtime_remove(dev);
 153         device_pm_check_callbacks(dev);
 154 }
 155
 156 /**
 157  * device_pm_move_before - Move device in the PM core's list of active devices.
 158  * @deva: Device to move in dpm_list.
 159  * @devb: Device @deva should come before.
 160  */
 161 void device_pm_move_before(struct device *deva, struct device *devb)
 162 {
 163         pr_debug("PM: Moving %s:%s before %s:%s\n",
 164                  deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
 165                  devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 166         /* Delete deva from dpm_list and reinsert before devb. */
 167         list_move_tail(&deva->power.entry, &devb->power.entry);
 168 }
 169
 170 /**
 171  * device_pm_move_after - Move device in the PM core's list of active devices.
 172  * @deva: Device to move in dpm_list.
 173  * @devb: Device @deva should come after.
 174  */
 175 void device_pm_move_after(struct device *deva, struct device *devb)
 176 {
 177         pr_debug("PM: Moving %s:%s after %s:%s\n",
 178                  deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
 179                  devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 180         /* Delete deva from dpm_list and reinsert after devb. */
 181         list_move(&deva->power.entry, &devb->power.entry);
 182 }
 183
 184 /**
 185  * device_pm_move_last - Move device to end of the PM core's list of devices.
 186  * @dev: Device to move in dpm_list.
 187  */
 188 void device_pm_move_last(struct device *dev)
 189 {
 190         pr_debug("PM: Moving %s:%s to end of list\n",
 191                  dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 192         list_move_tail(&dev->power.entry, &dpm_list);
 193 }
 194
 195 static ktime_t initcall_debug_start(struct device *dev)
 196 {
 197         ktime_t calltime = 0;
 198
 199         if (pm_print_times_enabled) {
 200                 pr_info("calling  %s+ @ %i, parent: %s\n",
 201                         dev_name(dev), task_pid_nr(current),
 202                         dev->parent ? dev_name(dev->parent) : "none");
 203                 calltime = ktime_get();
 204         }
 205
 206         return calltime;
 207 }
 208
 209 static void initcall_debug_report(struct device *dev, ktime_t calltime,
 210                                   int error, pm_message_t state,
 211                                   const char *info)
 212 {
 213         ktime_t rettime;
 214         s64 nsecs;
 215
 216         rettime = ktime_get();
 217         nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime));
 218
 219         if (pm_print_times_enabled) {
 220                 pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
 221                         error, (unsigned long long)nsecs >> 10);
 222         }
 223 }
 224
 225 /**
 226  * dpm_wait - Wait for a PM operation to complete.
 227  * @dev: Device to wait for.
 228  * @async: If unset, wait only if the device's power.async_suspend flag is set.
 229  */
 230 static void dpm_wait(struct device *dev, bool async)
 231 {
 232         if (!dev)
 233                 return;
 234
 235         if (async || (pm_async_enabled && dev->power.async_suspend))
 236                 wait_for_completion(&dev->power.completion);
 237 }
 238
 239 static int dpm_wait_fn(struct device *dev, void *async_ptr)
 240 {
 241         dpm_wait(dev, *((bool *)async_ptr));
 242         return 0;
 243 }
 244
 245 static void dpm_wait_for_children(struct device *dev, bool async)
 246 {
 247        device_for_each_child(dev, &async, dpm_wait_fn);
 248 }
 249
 250 static void dpm_wait_for_suppliers(struct device *dev, bool async)
 251 {
 252         struct device_link *link;
 253         int idx;
 254
 255         idx = device_links_read_lock();
 256
 257         /*
 258          * If the supplier goes away right after we've checked the link to it,
 259          * we'll wait for its completion to change the state, but that's fine,
 260          * because the only things that will block as a result are the SRCU
 261          * callbacks freeing the link objects for the links in the list we're
 262          * walking.
 263          */
 264         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
 265                 if (READ_ONCE(link->status) != DL_STATE_DORMANT)
 266                         dpm_wait(link->supplier, async);
 267
 268         device_links_read_unlock(idx);
 269 }
 270
 271 static void dpm_wait_for_superior(struct device *dev, bool async)
 272 {
 273         dpm_wait(dev->parent, async);
 274         dpm_wait_for_suppliers(dev, async);
 275 }
 276
 277 static void dpm_wait_for_consumers(struct device *dev, bool async)
 278 {
 279         struct device_link *link;
 280         int idx;
 281
 282         idx = device_links_read_lock();
 283
 284         /*
 285          * The status of a device link can only be changed from "dormant" by a
 286          * probe, but that cannot happen during system suspend/resume.  In
 287          * theory it can change to "dormant" at that time, but then it is
 288          * reasonable to wait for the target device anyway (eg. if it goes
 289          * away, it's better to wait for it to go away completely and then
 290          * continue instead of trying to continue in parallel with its
 291          * unregistration).
 292          */
 293         list_for_each_entry_rcu(link, &dev->links.consumers, s_node)
 294                 if (READ_ONCE(link->status) != DL_STATE_DORMANT)
 295                         dpm_wait(link->consumer, async);
 296
 297         device_links_read_unlock(idx);
 298 }
 299
 300 static void dpm_wait_for_subordinate(struct device *dev, bool async)
 301 {
 302         dpm_wait_for_children(dev, async);
 303         dpm_wait_for_consumers(dev, async);
 304 }
 305
 306 /**
 307  * pm_op - Return the PM operation appropriate for given PM event.
 308  * @ops: PM operations to choose from.
 309  * @state: PM transition of the system being carried out.
 310  */
 311 static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
 312 {
 313         switch (state.event) {
 314 #ifdef CONFIG_SUSPEND
 315         case PM_EVENT_SUSPEND:
 316                 return ops->suspend;
 317         case PM_EVENT_RESUME:
 318                 return ops->resume;
 319 #endif /* CONFIG_SUSPEND */
 320 #ifdef CONFIG_HIBERNATE_CALLBACKS
 321         case PM_EVENT_FREEZE:
 322         case PM_EVENT_QUIESCE:
 323                 return ops->freeze;
 324         case PM_EVENT_HIBERNATE:
 325                 return ops->poweroff;
 326         case PM_EVENT_THAW:
 327         case PM_EVENT_RECOVER:
 328                 return ops->thaw;
 329                 break;
 330         case PM_EVENT_RESTORE:
 331                 return ops->restore;
 332 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 333         }
 334
 335         return NULL;
 336 }
 337
 338 /**
 339  * pm_late_early_op - Return the PM operation appropriate for given PM event.
 340  * @ops: PM operations to choose from.
 341  * @state: PM transition of the system being carried out.
 342  *
 343  * Runtime PM is disabled for @dev while this function is being executed.
 344  */
 345 static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
 346                                       pm_message_t state)
 347 {
 348         switch (state.event) {
 349 #ifdef CONFIG_SUSPEND
 350         case PM_EVENT_SUSPEND:
 351                 return ops->suspend_late;
 352         case PM_EVENT_RESUME:
 353                 return ops->resume_early;
 354 #endif /* CONFIG_SUSPEND */
 355 #ifdef CONFIG_HIBERNATE_CALLBACKS
 356         case PM_EVENT_FREEZE:
 357         case PM_EVENT_QUIESCE:
 358                 return ops->freeze_late;
 359         case PM_EVENT_HIBERNATE:
 360                 return ops->poweroff_late;
 361         case PM_EVENT_THAW:
 362         case PM_EVENT_RECOVER:
 363                 return ops->thaw_early;
 364         case PM_EVENT_RESTORE:
 365                 return ops->restore_early;
 366 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 367         }
 368
 369         return NULL;
 370 }
 371
 372 /**
 373  * pm_noirq_op - Return the PM operation appropriate for given PM event.
 374  * @ops: PM operations to choose from.
 375  * @state: PM transition of the system being carried out.
 376  *
 377  * The driver of @dev will not receive interrupts while this function is being
 378  * executed.
 379  */
 380 static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
 381 {
 382         switch (state.event) {
 383 #ifdef CONFIG_SUSPEND
 384         case PM_EVENT_SUSPEND:
 385                 return ops->suspend_noirq;
 386         case PM_EVENT_RESUME:
 387                 return ops->resume_noirq;
 388 #endif /* CONFIG_SUSPEND */
 389 #ifdef CONFIG_HIBERNATE_CALLBACKS
 390         case PM_EVENT_FREEZE:
 391         case PM_EVENT_QUIESCE:
 392                 return ops->freeze_noirq;
 393         case PM_EVENT_HIBERNATE:
 394                 return ops->poweroff_noirq;
 395         case PM_EVENT_THAW:
 396         case PM_EVENT_RECOVER:
 397                 return ops->thaw_noirq;
 398         case PM_EVENT_RESTORE:
 399                 return ops->restore_noirq;
 400 #endif /* CONFIG_HIBERNATE_CALLBACKS */
 401         }
 402
 403         return NULL;
 404 }
 405
 406 static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info)
 407 {
 408         dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
 409                 ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
 410                 ", may wakeup" : "");
 411 }
 412
 413 static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,
 414                         int error)
 415 {
 416         printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
 417                 dev_name(dev), pm_verb(state.event), info, error);
 418 }
 419
 420 static void dpm_show_time(ktime_t starttime, pm_message_t state, int error,
 421                           const char *info)
 422 {
 423         ktime_t calltime;
 424         u64 usecs64;
 425         int usecs;
 426
 427         calltime = ktime_get();
 428         usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
 429         do_div(usecs64, NSEC_PER_USEC);
 430         usecs = usecs64;
 431         if (usecs == 0)
 432                 usecs = 1;
 433
 434         pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n",
 435                   info ?: "", info ? " " : "", pm_verb(state.event),
 436                   error ? "aborted" : "complete",
 437                   usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
 438 }
 439
 440 static int dpm_run_callback(pm_callback_t cb, struct device *dev,
 441                             pm_message_t state, const char *info)
 442 {
 443         ktime_t calltime;
 444         int error;
 445
 446         if (!cb)
 447                 return 0;
 448
 449         calltime = initcall_debug_start(dev);
 450
 451         pm_dev_dbg(dev, state, info);
 452         trace_device_pm_callback_start(dev, info, state.event);
 453         error = cb(dev);
 454         trace_device_pm_callback_end(dev, error);
 455         suspend_report_result(cb, error);
 456
 457         initcall_debug_report(dev, calltime, error, state, info);
 458
 459         return error;
 460 }
 461
 462 #ifdef CONFIG_DPM_WATCHDOG
 463 struct dpm_watchdog {
 464         struct device           *dev;
 465         struct task_struct      *tsk;
 466         struct timer_list       timer;
 467 };
 468
 469 #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \
 470         struct dpm_watchdog wd
 471
 472 /**
 473  * dpm_watchdog_handler - Driver suspend / resume watchdog handler.
 474  * @data: Watchdog object address.
 475  *
 476  * Called when a driver has timed out suspending or resuming.
 477  * There's not much we can do here to recover so panic() to
 478  * capture a crash-dump in pstore.
 479  */
 480 static void dpm_watchdog_handler(struct timer_list *t)
 481 {
 482         struct dpm_watchdog *wd = from_timer(wd, t, timer);
 483
 484         dev_emerg(wd->dev, "**** DPM device timeout ****\n");
 485         show_stack(wd->tsk, NULL);
 486         panic("%s %s: unrecoverable failure\n",
 487                 dev_driver_string(wd->dev), dev_name(wd->dev));
 488 }
 489
 490 /**
 491  * dpm_watchdog_set - Enable pm watchdog for given device.
 492  * @wd: Watchdog. Must be allocated on the stack.
 493  * @dev: Device to handle.
 494  */
 495 static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev)
 496 {
 497         struct timer_list *timer = &wd->timer;
 498
 499         wd->dev = dev;
 500         wd->tsk = current;
 501
 502         timer_setup_on_stack(timer, dpm_watchdog_handler, 0);
 503         /* use same timeout value for both suspend and resume */
 504         timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT;
 505         add_timer(timer);
 506 }
 507
 508 /**
 509  * dpm_watchdog_clear - Disable suspend/resume watchdog.
 510  * @wd: Watchdog to disable.
 511  */
 512 static void dpm_watchdog_clear(struct dpm_watchdog *wd)
 513 {
 514         struct timer_list *timer = &wd->timer;
 515
 516         del_timer_sync(timer);
 517         destroy_timer_on_stack(timer);
 518 }
 519 #else
 520 #define DECLARE_DPM_WATCHDOG_ON_STACK(wd)
 521 #define dpm_watchdog_set(x, y)
 522 #define dpm_watchdog_clear(x)
 523 #endif
 524
 525 /*------------------------- Resume routines -------------------------*/
 526
 527 /**
 528  * dev_pm_skip_next_resume_phases - Skip next system resume phases for device.
 529  * @dev: Target device.
 530  *
 531  * Make the core skip the "early resume" and "resume" phases for @dev.
 532  *
 533  * This function can be called by middle-layer code during the "noirq" phase of
 534  * system resume if necessary, but not by device drivers.
 535  */
 536 void dev_pm_skip_next_resume_phases(struct device *dev)
 537 {
 538         dev->power.is_late_suspended = false;
 539         dev->power.is_suspended = false;
 540 }
 541
 542 /**
 543  * suspend_event - Return a "suspend" message for given "resume" one.
 544  * @resume_msg: PM message representing a system-wide resume transition.
 545  */
 546 static pm_message_t suspend_event(pm_message_t resume_msg)
 547 {
 548         switch (resume_msg.event) {
 549         case PM_EVENT_RESUME:
 550                 return PMSG_SUSPEND;
 551         case PM_EVENT_THAW:
 552         case PM_EVENT_RESTORE:
 553                 return PMSG_FREEZE;
 554         case PM_EVENT_RECOVER:
 555                 return PMSG_HIBERNATE;
 556         }
 557         return PMSG_ON;
 558 }
 559
 560 /**
 561  * dev_pm_may_skip_resume - System-wide device resume optimization check.
 562  * @dev: Target device.
 563  *
 564  * Checks whether or not the device may be left in suspend after a system-wide
 565  * transition to the working state.
 566  */
 567 bool dev_pm_may_skip_resume(struct device *dev)
 568 {
 569         return !dev->power.must_resume && pm_transition.event != PM_EVENT_RESTORE;
 570 }
 571
 572 static pm_callback_t dpm_subsys_resume_noirq_cb(struct device *dev,
 573                                                 pm_message_t state,
 574                                                 const char **info_p)
 575 {
 576         pm_callback_t callback;
 577         const char *info;
 578
 579         if (dev->pm_domain) {
 580                 info = "noirq power domain ";
 581                 callback = pm_noirq_op(&dev->pm_domain->ops, state);
 582         } else if (dev->type && dev->type->pm) {
 583                 info = "noirq type ";
 584                 callback = pm_noirq_op(dev->type->pm, state);
 585         } else if (dev->class && dev->class->pm) {
 586                 info = "noirq class ";
 587                 callback = pm_noirq_op(dev->class->pm, state);
 588         } else if (dev->bus && dev->bus->pm) {
 589                 info = "noirq bus ";
 590                 callback = pm_noirq_op(dev->bus->pm, state);
 591         } else {
 592                 return NULL;
 593         }
 594
 595         if (info_p)
 596                 *info_p = info;
 597
 598         return callback;
 599 }
 600
 601 static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
 602                                                  pm_message_t state,
 603                                                  const char **info_p);
 604
 605 static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
 606                                                 pm_message_t state,
 607                                                 const char **info_p);
 608
 609 /**
 610  * device_resume_noirq - Execute a "noirq resume" callback for given device.
 611  * @dev: Device to handle.
 612  * @state: PM transition of the system being carried out.
 613  * @async: If true, the device is being resumed asynchronously.
 614  *
 615  * The driver of @dev will not receive interrupts while this function is being
 616  * executed.
 617  */
 618 static int device_resume_noirq(struct device *dev, pm_message_t state, bool async)
 619 {
 620         pm_callback_t callback;
 621         const char *info;
 622         bool skip_resume;
 623         int error = 0;
 624
 625         TRACE_DEVICE(dev);
 626         TRACE_RESUME(0);
 627
 628         if (dev->power.syscore || dev->power.direct_complete)
 629                 goto Out;
 630
 631         if (!dev->power.is_noirq_suspended)
 632                 goto Out;
 633
 634         dpm_wait_for_superior(dev, async);
 635
 636         skip_resume = dev_pm_may_skip_resume(dev);
 637
 638         callback = dpm_subsys_resume_noirq_cb(dev, state, &info);
 639         if (callback)
 640                 goto Run;
 641
 642         if (skip_resume)
 643                 goto Skip;
 644
 645         if (dev_pm_smart_suspend_and_suspended(dev)) {
 646                 pm_message_t suspend_msg = suspend_event(state);
 647
 648                 /*
 649                  * If "freeze" callbacks have been skipped during a transition
 650                  * related to hibernation, the subsequent "thaw" callbacks must
 651                  * be skipped too or bad things may happen.  Otherwise, resume
 652                  * callbacks are going to be run for the device, so its runtime
 653                  * PM status must be changed to reflect the new state after the
 654                  * transition under way.
 655                  */
 656                 if (!dpm_subsys_suspend_late_cb(dev, suspend_msg, NULL) &&
 657                     !dpm_subsys_suspend_noirq_cb(dev, suspend_msg, NULL)) {
 658                         if (state.event == PM_EVENT_THAW) {
 659                                 skip_resume = true;
 660                                 goto Skip;
 661                         } else {
 662                                 pm_runtime_set_active(dev);
 663                         }
 664                 }
 665         }
 666
 667         if (dev->driver && dev->driver->pm) {
 668                 info = "noirq driver ";
 669                 callback = pm_noirq_op(dev->driver->pm, state);
 670         }
 671
 672 Run:
 673         error = dpm_run_callback(callback, dev, state, info);
 674
 675 Skip:
 676         dev->power.is_noirq_suspended = false;
 677
 678         if (skip_resume) {
 679                 /*
 680                  * The device is going to be left in suspend, but it might not
 681                  * have been in runtime suspend before the system suspended, so
 682                  * its runtime PM status needs to be updated to avoid confusing
 683                  * the runtime PM framework when runtime PM is enabled for the
 684                  * device again.
 685                  */
 686                 pm_runtime_set_suspended(dev);
 687                 dev_pm_skip_next_resume_phases(dev);
 688         }
 689
 690 Out:
 691         complete_all(&dev->power.completion);
 692         TRACE_RESUME(error);
 693         return error;
 694 }
 695
 696 static bool is_async(struct device *dev)
 697 {
 698         return dev->power.async_suspend && pm_async_enabled
 699                 && !pm_trace_is_enabled();
 700 }
 701
 702 static void async_resume_noirq(void *data, async_cookie_t cookie)
 703 {
 704         struct device *dev = (struct device *)data;
 705         int error;
 706
 707         error = device_resume_noirq(dev, pm_transition, true);
 708         if (error)
 709                 pm_dev_err(dev, pm_transition, " async", error);
 710
 711         put_device(dev);
 712 }
 713
 714 void dpm_noirq_resume_devices(pm_message_t state)
 715 {
 716         struct device *dev;
 717         ktime_t starttime = ktime_get();
 718
 719         trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true);
 720         mutex_lock(&dpm_list_mtx);
 721         pm_transition = state;
 722
 723         /*
 724          * Advanced the async threads upfront,
 725          * in case the starting of async threads is
 726          * delayed by non-async resuming devices.
 727          */
 728         list_for_each_entry(dev, &dpm_noirq_list, power.entry) {
 729                 reinit_completion(&dev->power.completion);
 730                 if (is_async(dev)) {
 731                         get_device(dev);
 732                         async_schedule(async_resume_noirq, dev);
 733                 }
 734         }
 735
 736         while (!list_empty(&dpm_noirq_list)) {
 737                 dev = to_device(dpm_noirq_list.next);
 738                 get_device(dev);
 739                 list_move_tail(&dev->power.entry, &dpm_late_early_list);
 740                 mutex_unlock(&dpm_list_mtx);
 741
 742                 if (!is_async(dev)) {
 743                         int error;
 744
 745                         error = device_resume_noirq(dev, state, false);
 746                         if (error) {
 747                                 suspend_stats.failed_resume_noirq++;
 748                                 dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
 749                                 dpm_save_failed_dev(dev_name(dev));
 750                                 pm_dev_err(dev, state, " noirq", error);
 751                         }
 752                 }
 753
 754                 mutex_lock(&dpm_list_mtx);
 755                 put_device(dev);
 756         }
 757         mutex_unlock(&dpm_list_mtx);
 758         async_synchronize_full();
 759         dpm_show_time(starttime, state, 0, "noirq");
 760         trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
 761 }
 762
 763 void dpm_noirq_end(void)
 764 {
 765         resume_device_irqs();
 766         device_wakeup_disarm_wake_irqs();
 767         cpuidle_resume();
 768 }
 769
 770 /**
 771  * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
 772  * @state: PM transition of the system being carried out.
 773  *
 774  * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and
 775  * allow device drivers' interrupt handlers to be called.
 776  */
 777 void dpm_resume_noirq(pm_message_t state)
 778 {
 779         dpm_noirq_resume_devices(state);
 780         dpm_noirq_end();
 781 }
 782
 783 static pm_callback_t dpm_subsys_resume_early_cb(struct device *dev,
 784                                                 pm_message_t state,
 785                                                 const char **info_p)
 786 {
 787         pm_callback_t callback;
 788         const char *info;
 789
 790         if (dev->pm_domain) {
 791                 info = "early power domain ";
 792                 callback = pm_late_early_op(&dev->pm_domain->ops, state);
 793         } else if (dev->type && dev->type->pm) {
 794                 info = "early type ";
 795                 callback = pm_late_early_op(dev->type->pm, state);
 796         } else if (dev->class && dev->class->pm) {
 797                 info = "early class ";
 798                 callback = pm_late_early_op(dev->class->pm, state);
 799         } else if (dev->bus && dev->bus->pm) {
 800                 info = "early bus ";
 801                 callback = pm_late_early_op(dev->bus->pm, state);
 802         } else {
 803                 return NULL;
 804         }
 805
 806         if (info_p)
 807                 *info_p = info;
 808
 809         return callback;
 810 }
 811
 812 /**
 813  * device_resume_early - Execute an "early resume" callback for given device.
 814  * @dev: Device to handle.
 815  * @state: PM transition of the system being carried out.
 816  * @async: If true, the device is being resumed asynchronously.
 817  *
 818  * Runtime PM is disabled for @dev while this function is being executed.
 819  */
 820 static int device_resume_early(struct device *dev, pm_message_t state, bool async)
 821 {
 822         pm_callback_t callback;
 823         const char *info;
 824         int error = 0;
 825
 826         TRACE_DEVICE(dev);
 827         TRACE_RESUME(0);
 828
 829         if (dev->power.syscore || dev->power.direct_complete)
 830                 goto Out;
 831
 832         if (!dev->power.is_late_suspended)
 833                 goto Out;
 834
 835         dpm_wait_for_superior(dev, async);
 836
 837         callback = dpm_subsys_resume_early_cb(dev, state, &info);
 838
 839         if (!callback && dev->driver && dev->driver->pm) {
 840                 info = "early driver ";
 841                 callback = pm_late_early_op(dev->driver->pm, state);
 842         }
 843
 844         error = dpm_run_callback(callback, dev, state, info);
 845         dev->power.is_late_suspended = false;
 846
 847  Out:
 848         TRACE_RESUME(error);
 849
 850         pm_runtime_enable(dev);
 851         complete_all(&dev->power.completion);
 852         return error;
 853 }
 854
 855 static void async_resume_early(void *data, async_cookie_t cookie)
 856 {
 857         struct device *dev = (struct device *)data;
 858         int error;
 859
 860         error = device_resume_early(dev, pm_transition, true);
 861         if (error)
 862                 pm_dev_err(dev, pm_transition, " async", error);
 863
 864         put_device(dev);
 865 }
 866
 867 /**
 868  * dpm_resume_early - Execute "early resume" callbacks for all devices.
 869  * @state: PM transition of the system being carried out.
 870  */
 871 void dpm_resume_early(pm_message_t state)
 872 {
 873         struct device *dev;
 874         ktime_t starttime = ktime_get();
 875
 876         trace_suspend_resume(TPS("dpm_resume_early"), state.event, true);
 877         mutex_lock(&dpm_list_mtx);
 878         pm_transition = state;
 879
 880         /*
 881          * Advanced the async threads upfront,
 882          * in case the starting of async threads is
 883          * delayed by non-async resuming devices.
 884          */
 885         list_for_each_entry(dev, &dpm_late_early_list, power.entry) {
 886                 reinit_completion(&dev->power.completion);
 887                 if (is_async(dev)) {
 888                         get_device(dev);
 889                         async_schedule(async_resume_early, dev);
 890                 }
 891         }
 892
 893         while (!list_empty(&dpm_late_early_list)) {
 894                 dev = to_device(dpm_late_early_list.next);
 895                 get_device(dev);
 896                 list_move_tail(&dev->power.entry, &dpm_suspended_list);
 897                 mutex_unlock(&dpm_list_mtx);
 898
 899                 if (!is_async(dev)) {
 900                         int error;
 901
 902                         error = device_resume_early(dev, state, false);
 903                         if (error) {
 904                                 suspend_stats.failed_resume_early++;
 905                                 dpm_save_failed_step(SUSPEND_RESUME_EARLY);
 906                                 dpm_save_failed_dev(dev_name(dev));
 907                                 pm_dev_err(dev, state, " early", error);
 908                         }
 909                 }
 910                 mutex_lock(&dpm_list_mtx);
 911                 put_device(dev);
 912         }
 913         mutex_unlock(&dpm_list_mtx);
 914         async_synchronize_full();
 915         dpm_show_time(starttime, state, 0, "early");
 916         trace_suspend_resume(TPS("dpm_resume_early"), state.event, false);
 917 }
 918
 919 /**
 920  * dpm_resume_start - Execute "noirq" and "early" device callbacks.
 921  * @state: PM transition of the system being carried out.
 922  */
 923 void dpm_resume_start(pm_message_t state)
 924 {
 925         dpm_resume_noirq(state);
 926         dpm_resume_early(state);
 927 }
 928 EXPORT_SYMBOL_GPL(dpm_resume_start);
 929
 930 /**
 931  * device_resume - Execute "resume" callbacks for given device.
 932  * @dev: Device to handle.
 933  * @state: PM transition of the system being carried out.
 934  * @async: If true, the device is being resumed asynchronously.
 935  */
 936 static int device_resume(struct device *dev, pm_message_t state, bool async)
 937 {
 938         pm_callback_t callback = NULL;
 939         const char *info = NULL;
 940         int error = 0;
 941         DECLARE_DPM_WATCHDOG_ON_STACK(wd);
 942
 943         TRACE_DEVICE(dev);
 944         TRACE_RESUME(0);
 945
 946         if (dev->power.syscore)
 947                 goto Complete;
 948
 949         if (dev->power.direct_complete) {
 950                 /* Match the pm_runtime_disable() in __device_suspend(). */
 951                 pm_runtime_enable(dev);
 952                 goto Complete;
 953         }
 954
 955         dpm_wait_for_superior(dev, async);
 956         dpm_watchdog_set(&wd, dev);
 957         device_lock(dev);
 958
 959         /*
 960          * This is a fib.  But we'll allow new children to be added below
 961          * a resumed device, even if the device hasn't been completed yet.
 962          */
 963         dev->power.is_prepared = false;
 964
 965         if (!dev->power.is_suspended)
 966                 goto Unlock;
 967
 968         if (dev->pm_domain) {
 969                 info = "power domain ";
 970                 callback = pm_op(&dev->pm_domain->ops, state);
 971                 goto Driver;
 972         }
 973
 974         if (dev->type && dev->type->pm) {
 975                 info = "type ";
 976                 callback = pm_op(dev->type->pm, state);
 977                 goto Driver;
 978         }
 979
 980         if (dev->class && dev->class->pm) {
 981                 info = "class ";
 982                 callback = pm_op(dev->class->pm, state);
 983                 goto Driver;
 984         }
 985
 986         if (dev->bus) {
 987                 if (dev->bus->pm) {
 988                         info = "bus ";
 989                         callback = pm_op(dev->bus->pm, state);
 990                 } else if (dev->bus->resume) {
 991                         info = "legacy bus ";
 992                         callback = dev->bus->resume;
 993                         goto End;
 994                 }
 995         }
 996
 997  Driver:
 998         if (!callback && dev->driver && dev->driver->pm) {
 999                 info = "driver ";
1000                 callback = pm_op(dev->driver->pm, state);
1001         }
1002
1003  End:
1004         error = dpm_run_callback(callback, dev, state, info);
1005         dev->power.is_suspended = false;
1006
1007  Unlock:
1008         device_unlock(dev);
1009         dpm_watchdog_clear(&wd);
1010
1011  Complete:
1012         complete_all(&dev->power.completion);
1013
1014         TRACE_RESUME(error);
1015
1016         return error;
1017 }
1018
1019 static void async_resume(void *data, async_cookie_t cookie)
1020 {
1021         struct device *dev = (struct device *)data;
1022         int error;
1023
1024         error = device_resume(dev, pm_transition, true);
1025         if (error)
1026                 pm_dev_err(dev, pm_transition, " async", error);
1027         put_device(dev);
1028 }
1029
1030 /**
1031  * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
1032  * @state: PM transition of the system being carried out.
1033  *
1034  * Execute the appropriate "resume" callback for all devices whose status
1035  * indicates that they are suspended.
1036  */
1037 void dpm_resume(pm_message_t state)
1038 {
1039         struct device *dev;
1040         ktime_t starttime = ktime_get();
1041
1042         trace_suspend_resume(TPS("dpm_resume"), state.event, true);
1043         might_sleep();
1044
1045         mutex_lock(&dpm_list_mtx);
1046         pm_transition = state;
1047         async_error = 0;
1048
1049         list_for_each_entry(dev, &dpm_suspended_list, power.entry) {
1050                 reinit_completion(&dev->power.completion);
1051                 if (is_async(dev)) {
1052                         get_device(dev);
1053                         async_schedule(async_resume, dev);
1054                 }
1055         }
1056
1057         while (!list_empty(&dpm_suspended_list)) {
1058                 dev = to_device(dpm_suspended_list.next);
1059                 get_device(dev);
1060                 if (!is_async(dev)) {
1061                         int error;
1062
1063                         mutex_unlock(&dpm_list_mtx);
1064
1065                         error = device_resume(dev, state, false);
1066                         if (error) {
1067                                 suspend_stats.failed_resume++;
1068                                 dpm_save_failed_step(SUSPEND_RESUME);
1069                                 dpm_save_failed_dev(dev_name(dev));
1070                                 pm_dev_err(dev, state, "", error);
1071                         }
1072
1073                         mutex_lock(&dpm_list_mtx);
1074                 }
1075                 if (!list_empty(&dev->power.entry))
1076                         list_move_tail(&dev->power.entry, &dpm_prepared_list);
1077                 put_device(dev);
1078         }
1079         mutex_unlock(&dpm_list_mtx);
1080         async_synchronize_full();
1081         dpm_show_time(starttime, state, 0, NULL);
1082
1083         cpufreq_resume();
1084         trace_suspend_resume(TPS("dpm_resume"), state.event, false);
1085 }
1086
1087 /**
1088  * device_complete - Complete a PM transition for given device.
1089  * @dev: Device to handle.
1090  * @state: PM transition of the system being carried out.
1091  */
1092 static void device_complete(struct device *dev, pm_message_t state)
1093 {
1094         void (*callback)(struct device *) = NULL;
1095         const char *info = NULL;
1096
1097         if (dev->power.syscore)
1098                 return;
1099
1100         device_lock(dev);
1101
1102         if (dev->pm_domain) {
1103                 info = "completing power domain ";
1104                 callback = dev->pm_domain->ops.complete;
1105         } else if (dev->type && dev->type->pm) {
1106                 info = "completing type ";
1107                 callback = dev->type->pm->complete;
1108         } else if (dev->class && dev->class->pm) {
1109                 info = "completing class ";
1110                 callback = dev->class->pm->complete;
1111         } else if (dev->bus && dev->bus->pm) {
1112                 info = "completing bus ";
1113                 callback = dev->bus->pm->complete;
1114         }
1115
1116         if (!callback && dev->driver && dev->driver->pm) {
1117                 info = "completing driver ";
1118                 callback = dev->driver->pm->complete;
1119         }
1120
1121         if (callback) {
1122                 pm_dev_dbg(dev, state, info);
1123                 callback(dev);
1124         }
1125
1126         device_unlock(dev);
1127
1128         pm_runtime_put(dev);
1129 }
1130
1131 /**
1132  * dpm_complete - Complete a PM transition for all non-sysdev devices.
1133  * @state: PM transition of the system being carried out.
1134  *
1135  * Execute the ->complete() callbacks for all devices whose PM status is not
1136  * DPM_ON (this allows new devices to be registered).
1137  */
1138 void dpm_complete(pm_message_t state)
1139 {
1140         struct list_head list;
1141
1142         trace_suspend_resume(TPS("dpm_complete"), state.event, true);
1143         might_sleep();
1144
1145         INIT_LIST_HEAD(&list);
1146         mutex_lock(&dpm_list_mtx);
1147         while (!list_empty(&dpm_prepared_list)) {
1148                 struct device *dev = to_device(dpm_prepared_list.prev);
1149
1150                 get_device(dev);
1151                 dev->power.is_prepared = false;
1152                 list_move(&dev->power.entry, &list);
1153                 mutex_unlock(&dpm_list_mtx);
1154
1155                 trace_device_pm_callback_start(dev, "", state.event);
1156                 device_complete(dev, state);
1157                 trace_device_pm_callback_end(dev, 0);
1158
1159                 mutex_lock(&dpm_list_mtx);
1160                 put_device(dev);
1161         }
1162         list_splice(&list, &dpm_list);
1163         mutex_unlock(&dpm_list_mtx);
1164
1165         /* Allow device probing and trigger re-probing of deferred devices */
1166         device_unblock_probing();
1167         trace_suspend_resume(TPS("dpm_complete"), state.event, false);
1168 }
1169
1170 /**
1171  * dpm_resume_end - Execute "resume" callbacks and complete system transition.
1172  * @state: PM transition of the system being carried out.
1173  *
1174  * Execute "resume" callbacks for all devices and complete the PM transition of
1175  * the system.
1176  */
1177 void dpm_resume_end(pm_message_t state)
1178 {
1179         dpm_resume(state);
1180         dpm_complete(state);
1181 }
1182 EXPORT_SYMBOL_GPL(dpm_resume_end);
1183
1184
1185 /*------------------------- Suspend routines -------------------------*/
1186
1187 /**
1188  * resume_event - Return a "resume" message for given "suspend" sleep state.
1189  * @sleep_state: PM message representing a sleep state.
1190  *
1191  * Return a PM message representing the resume event corresponding to given
1192  * sleep state.
1193  */
1194 static pm_message_t resume_event(pm_message_t sleep_state)
1195 {
1196         switch (sleep_state.event) {
1197         case PM_EVENT_SUSPEND:
1198                 return PMSG_RESUME;
1199         case PM_EVENT_FREEZE:
1200         case PM_EVENT_QUIESCE:
1201                 return PMSG_RECOVER;
1202         case PM_EVENT_HIBERNATE:
1203                 return PMSG_RESTORE;
1204         }
1205         return PMSG_ON;
1206 }
1207
1208 static void dpm_superior_set_must_resume(struct device *dev)
1209 {
1210         struct device_link *link;
1211         int idx;
1212
1213         if (dev->parent)
1214                 dev->parent->power.must_resume = true;
1215
1216         idx = device_links_read_lock();
1217
1218         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node)
1219                 link->supplier->power.must_resume = true;
1220
1221         device_links_read_unlock(idx);
1222 }
1223
1224 static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev,
1225                                                  pm_message_t state,
1226                                                  const char **info_p)
1227 {
1228         pm_callback_t callback;
1229         const char *info;
1230
1231         if (dev->pm_domain) {
1232                 info = "noirq power domain ";
1233                 callback = pm_noirq_op(&dev->pm_domain->ops, state);
1234         } else if (dev->type && dev->type->pm) {
1235                 info = "noirq type ";
1236                 callback = pm_noirq_op(dev->type->pm, state);
1237         } else if (dev->class && dev->class->pm) {
1238                 info = "noirq class ";
1239                 callback = pm_noirq_op(dev->class->pm, state);
1240         } else if (dev->bus && dev->bus->pm) {
1241                 info = "noirq bus ";
1242                 callback = pm_noirq_op(dev->bus->pm, state);
1243         } else {
1244                 return NULL;
1245         }
1246
1247         if (info_p)
1248                 *info_p = info;
1249
1250         return callback;
1251 }
1252
1253 static bool device_must_resume(struct device *dev, pm_message_t state,
1254                                bool no_subsys_suspend_noirq)
1255 {
1256         pm_message_t resume_msg = resume_event(state);
1257
1258         /*
1259          * If all of the device driver's "noirq", "late" and "early" callbacks
1260          * are invoked directly by the core, the decision to allow the device to
1261          * stay in suspend can be based on its current runtime PM status and its
1262          * wakeup settings.
1263          */
1264         if (no_subsys_suspend_noirq &&
1265             !dpm_subsys_suspend_late_cb(dev, state, NULL) &&
1266             !dpm_subsys_resume_early_cb(dev, resume_msg, NULL) &&
1267             !dpm_subsys_resume_noirq_cb(dev, resume_msg, NULL))
1268                 return !pm_runtime_status_suspended(dev) &&
1269                         (resume_msg.event != PM_EVENT_RESUME ||
1270                          (device_can_wakeup(dev) && !device_may_wakeup(dev)));
1271
1272         /*
1273          * The only safe strategy here is to require that if the device may not
1274          * be left in suspend, resume callbacks must be invoked for it.
1275          */
1276         return !dev->power.may_skip_resume;
1277 }
1278
1279 /**
1280  * __device_suspend_noirq - Execute a "noirq suspend" callback for given device.
1281  * @dev: Device to handle.
1282  * @state: PM transition of the system being carried out.
1283  * @async: If true, the device is being suspended asynchronously.
1284  *
1285  * The driver of @dev will not receive interrupts while this function is being
1286  * executed.
1287  */
1288 static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async)
1289 {
1290         pm_callback_t callback;
1291         const char *info;
1292         bool no_subsys_cb = false;
1293         int error = 0;
1294
1295         TRACE_DEVICE(dev);
1296         TRACE_SUSPEND(0);
1297
1298         dpm_wait_for_subordinate(dev, async);
1299
1300         if (async_error)
1301                 goto Complete;
1302
1303         if (pm_wakeup_pending()) {
1304                 async_error = -EBUSY;
1305                 goto Complete;
1306         }
1307
1308         if (dev->power.syscore || dev->power.direct_complete)
1309                 goto Complete;
1310
1311         callback = dpm_subsys_suspend_noirq_cb(dev, state, &info);
1312         if (callback)
1313                 goto Run;
1314
1315         no_subsys_cb = !dpm_subsys_suspend_late_cb(dev, state, NULL);
1316
1317         if (dev_pm_smart_suspend_and_suspended(dev) && no_subsys_cb)
1318                 goto Skip;
1319
1320         if (dev->driver && dev->driver->pm) {
1321                 info = "noirq driver ";
1322                 callback = pm_noirq_op(dev->driver->pm, state);
1323         }
1324
1325 Run:
1326         error = dpm_run_callback(callback, dev, state, info);
1327         if (error) {
1328                 async_error = error;
1329                 goto Complete;
1330         }
1331
1332 Skip:
1333         dev->power.is_noirq_suspended = true;
1334
1335         if (dev_pm_test_driver_flags(dev, DPM_FLAG_LEAVE_SUSPENDED)) {
1336                 dev->power.must_resume = dev->power.must_resume ||
1337                                 atomic_read(&dev->power.usage_count) > 1 ||
1338                                 device_must_resume(dev, state, no_subsys_cb);
1339         } else {
1340                 dev->power.must_resume = true;
1341         }
1342
1343         if (dev->power.must_resume)
1344                 dpm_superior_set_must_resume(dev);
1345
1346 Complete:
1347         complete_all(&dev->power.completion);
1348         TRACE_SUSPEND(error);
1349         return error;
1350 }
1351
1352 static void async_suspend_noirq(void *data, async_cookie_t cookie)
1353 {
1354         struct device *dev = (struct device *)data;
1355         int error;
1356
1357         error = __device_suspend_noirq(dev, pm_transition, true);
1358         if (error) {
1359                 dpm_save_failed_dev(dev_name(dev));
1360                 pm_dev_err(dev, pm_transition, " async", error);
1361         }
1362
1363         put_device(dev);
1364 }
1365
1366 static int device_suspend_noirq(struct device *dev)
1367 {
1368         reinit_completion(&dev->power.completion);
1369
1370         if (is_async(dev)) {
1371                 get_device(dev);
1372                 async_schedule(async_suspend_noirq, dev);
1373                 return 0;
1374         }
1375         return __device_suspend_noirq(dev, pm_transition, false);
1376 }
1377
1378 void dpm_noirq_begin(void)
1379 {
1380         cpuidle_pause();
1381         device_wakeup_arm_wake_irqs();
1382         suspend_device_irqs();
1383 }
1384
1385 int dpm_noirq_suspend_devices(pm_message_t state)
1386 {
1387         ktime_t starttime = ktime_get();
1388         int error = 0;
1389
1390         trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true);
1391         mutex_lock(&dpm_list_mtx);
1392         pm_transition = state;
1393         async_error = 0;
1394
1395         while (!list_empty(&dpm_late_early_list)) {
1396                 struct device *dev = to_device(dpm_late_early_list.prev);
1397
1398                 get_device(dev);
1399                 mutex_unlock(&dpm_list_mtx);
1400
1401                 error = device_suspend_noirq(dev);
1402
1403                 mutex_lock(&dpm_list_mtx);
1404                 if (error) {
1405                         pm_dev_err(dev, state, " noirq", error);
1406                         dpm_save_failed_dev(dev_name(dev));
1407                         put_device(dev);
1408                         break;
1409                 }
1410                 if (!list_empty(&dev->power.entry))
1411                         list_move(&dev->power.entry, &dpm_noirq_list);
1412                 put_device(dev);
1413
1414                 if (async_error)
1415                         break;
1416         }
1417         mutex_unlock(&dpm_list_mtx);
1418         async_synchronize_full();
1419         if (!error)
1420                 error = async_error;
1421
1422         if (error) {
1423                 suspend_stats.failed_suspend_noirq++;
1424                 dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
1425         }
1426         dpm_show_time(starttime, state, error, "noirq");
1427         trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false);
1428         return error;
1429 }
1430
1431 /**
1432  * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
1433  * @state: PM transition of the system being carried out.
1434  *
1435  * Prevent device drivers' interrupt handlers from being called and invoke
1436  * "noirq" suspend callbacks for all non-sysdev devices.
1437  */
1438 int dpm_suspend_noirq(pm_message_t state)
1439 {
1440         int ret;
1441
1442         dpm_noirq_begin();
1443         ret = dpm_noirq_suspend_devices(state);
1444         if (ret)
1445                 dpm_resume_noirq(resume_event(state));
1446
1447         return ret;
1448 }
1449
1450 static void dpm_propagate_wakeup_to_parent(struct device *dev)
1451 {
1452         struct device *parent = dev->parent;
1453
1454         if (!parent)
1455                 return;
1456
1457         spin_lock_irq(&parent->power.lock);
1458
1459         if (dev->power.wakeup_path && !parent->power.ignore_children)
1460                 parent->power.wakeup_path = true;
1461
1462         spin_unlock_irq(&parent->power.lock);
1463 }
1464
1465 static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev,
1466                                                 pm_message_t state,
1467                                                 const char **info_p)
1468 {
1469         pm_callback_t callback;
1470         const char *info;
1471
1472         if (dev->pm_domain) {
1473                 info = "late power domain ";
1474                 callback = pm_late_early_op(&dev->pm_domain->ops, state);
1475         } else if (dev->type && dev->type->pm) {
1476                 info = "late type ";
1477                 callback = pm_late_early_op(dev->type->pm, state);
1478         } else if (dev->class && dev->class->pm) {
1479                 info = "late class ";
1480                 callback = pm_late_early_op(dev->class->pm, state);
1481         } else if (dev->bus && dev->bus->pm) {
1482                 info = "late bus ";
1483                 callback = pm_late_early_op(dev->bus->pm, state);
1484         } else {
1485                 return NULL;
1486         }
1487
1488         if (info_p)
1489                 *info_p = info;
1490
1491         return callback;
1492 }
1493
1494 /**
1495  * __device_suspend_late - Execute a "late suspend" callback for given device.
1496  * @dev: Device to handle.
1497  * @state: PM transition of the system being carried out.
1498  * @async: If true, the device is being suspended asynchronously.
1499  *
1500  * Runtime PM is disabled for @dev while this function is being executed.
1501  */
1502 static int __device_suspend_late(struct device *dev, pm_message_t state, bool async)
1503 {
1504         pm_callback_t callback;
1505         const char *info;
1506         int error = 0;
1507
1508         TRACE_DEVICE(dev);
1509         TRACE_SUSPEND(0);
1510
1511         __pm_runtime_disable(dev, false);
1512
1513         dpm_wait_for_subordinate(dev, async);
1514
1515         if (async_error)
1516                 goto Complete;
1517
1518         if (pm_wakeup_pending()) {
1519                 async_error = -EBUSY;
1520                 goto Complete;
1521         }
1522
1523         if (dev->power.syscore || dev->power.direct_complete)
1524                 goto Complete;
1525
1526         callback = dpm_subsys_suspend_late_cb(dev, state, &info);
1527         if (callback)
1528                 goto Run;
1529
1530         if (dev_pm_smart_suspend_and_suspended(dev) &&
1531             !dpm_subsys_suspend_noirq_cb(dev, state, NULL))
1532                 goto Skip;
1533
1534         if (dev->driver && dev->driver->pm) {
1535                 info = "late driver ";
1536                 callback = pm_late_early_op(dev->driver->pm, state);
1537         }
1538
1539 Run:
1540         error = dpm_run_callback(callback, dev, state, info);
1541         if (error) {
1542                 async_error = error;
1543                 goto Complete;
1544         }
1545         dpm_propagate_wakeup_to_parent(dev);
1546
1547 Skip:
1548         dev->power.is_late_suspended = true;
1549
1550 Complete:
1551         TRACE_SUSPEND(error);
1552         complete_all(&dev->power.completion);
1553         return error;
1554 }
1555
1556 static void async_suspend_late(void *data, async_cookie_t cookie)
1557 {
1558         struct device *dev = (struct device *)data;
1559         int error;
1560
1561         error = __device_suspend_late(dev, pm_transition, true);
1562         if (error) {
1563                 dpm_save_failed_dev(dev_name(dev));
1564                 pm_dev_err(dev, pm_transition, " async", error);
1565         }
1566         put_device(dev);
1567 }
1568
1569 static int device_suspend_late(struct device *dev)
1570 {
1571         reinit_completion(&dev->power.completion);
1572
1573         if (is_async(dev)) {
1574                 get_device(dev);
1575                 async_schedule(async_suspend_late, dev);
1576                 return 0;
1577         }
1578
1579         return __device_suspend_late(dev, pm_transition, false);
1580 }
1581
1582 /**
1583  * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
1584  * @state: PM transition of the system being carried out.
1585  */
1586 int dpm_suspend_late(pm_message_t state)
1587 {
1588         ktime_t starttime = ktime_get();
1589         int error = 0;
1590
1591         trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true);
1592         mutex_lock(&dpm_list_mtx);
1593         pm_transition = state;
1594         async_error = 0;
1595
1596         while (!list_empty(&dpm_suspended_list)) {
1597                 struct device *dev = to_device(dpm_suspended_list.prev);
1598
1599                 get_device(dev);
1600                 mutex_unlock(&dpm_list_mtx);
1601
1602                 error = device_suspend_late(dev);
1603
1604                 mutex_lock(&dpm_list_mtx);
1605                 if (!list_empty(&dev->power.entry))
1606                         list_move(&dev->power.entry, &dpm_late_early_list);
1607
1608                 if (error) {
1609                         pm_dev_err(dev, state, " late", error);
1610                         dpm_save_failed_dev(dev_name(dev));
1611                         put_device(dev);
1612                         break;
1613                 }
1614                 put_device(dev);
1615
1616                 if (async_error)
1617                         break;
1618         }
1619         mutex_unlock(&dpm_list_mtx);
1620         async_synchronize_full();
1621         if (!error)
1622                 error = async_error;
1623         if (error) {
1624                 suspend_stats.failed_suspend_late++;
1625                 dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
1626                 dpm_resume_early(resume_event(state));
1627         }
1628         dpm_show_time(starttime, state, error, "late");
1629         trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false);
1630         return error;
1631 }
1632
1633 /**
1634  * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
1635  * @state: PM transition of the system being carried out.
1636  */
1637 int dpm_suspend_end(pm_message_t state)
1638 {
1639         int error = dpm_suspend_late(state);
1640         if (error)
1641                 return error;
1642
1643         error = dpm_suspend_noirq(state);
1644         if (error) {
1645                 dpm_resume_early(resume_event(state));
1646                 return error;
1647         }
1648
1649         return 0;
1650 }
1651 EXPORT_SYMBOL_GPL(dpm_suspend_end);
1652
1653 /**
1654  * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
1655  * @dev: Device to suspend.
1656  * @state: PM transition of the system being carried out.
1657  * @cb: Suspend callback to execute.
1658  * @info: string description of caller.
1659  */
1660 static int legacy_suspend(struct device *dev, pm_message_t state,
1661                           int (*cb)(struct device *dev, pm_message_t state),
1662                           const char *info)
1663 {
1664         int error;
1665         ktime_t calltime;
1666
1667         calltime = initcall_debug_start(dev);
1668
1669         trace_device_pm_callback_start(dev, info, state.event);
1670         error = cb(dev, state);
1671         trace_device_pm_callback_end(dev, error);
1672         suspend_report_result(cb, error);
1673
1674         initcall_debug_report(dev, calltime, error, state, info);
1675
1676         return error;
1677 }
1678
1679 static void dpm_clear_superiors_direct_complete(struct device *dev)
1680 {
1681         struct device_link *link;
1682         int idx;
1683
1684         if (dev->parent) {
1685                 spin_lock_irq(&dev->parent->power.lock);
1686                 dev->parent->power.direct_complete = false;
1687                 spin_unlock_irq(&dev->parent->power.lock);
1688         }
1689
1690         idx = device_links_read_lock();
1691
1692         list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) {
1693                 spin_lock_irq(&link->supplier->power.lock);
1694                 link->supplier->power.direct_complete = false;
1695                 spin_unlock_irq(&link->supplier->power.lock);
1696         }
1697
1698         device_links_read_unlock(idx);
1699 }
1700
1701 /**
1702  * __device_suspend - Execute "suspend" callbacks for given device.
1703  * @dev: Device to handle.
1704  * @state: PM transition of the system being carried out.
1705  * @async: If true, the device is being suspended asynchronously.
1706  */
1707 static int __device_suspend(struct device *dev, pm_message_t state, bool async)
1708 {
1709         pm_callback_t callback = NULL;
1710         const char *info = NULL;
1711         int error = 0;
1712         DECLARE_DPM_WATCHDOG_ON_STACK(wd);
1713
1714         TRACE_DEVICE(dev);
1715         TRACE_SUSPEND(0);
1716
1717         dpm_wait_for_subordinate(dev, async);
1718
1719         if (async_error)
1720                 goto Complete;
1721
1722         /*
1723          * If a device configured to wake up the system from sleep states
1724          * has been suspended at run time and there's a resume request pending
1725          * for it, this is equivalent to the device signaling wakeup, so the
1726          * system suspend operation should be aborted.
1727          */
1728         if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
1729                 pm_wakeup_event(dev, 0);
1730
1731         if (pm_wakeup_pending()) {
1732                 async_error = -EBUSY;
1733                 goto Complete;
1734         }
1735
1736         if (dev->power.syscore)
1737                 goto Complete;
1738
1739         if (dev->power.direct_complete) {
1740                 if (pm_runtime_status_suspended(dev)) {
1741                         pm_runtime_disable(dev);
1742                         if (pm_runtime_status_suspended(dev))
1743                                 goto Complete;
1744
1745                         pm_runtime_enable(dev);
1746                 }
1747                 dev->power.direct_complete = false;
1748         }
1749
1750         dev->power.may_skip_resume = false;
1751         dev->power.must_resume = false;
1752
1753         dpm_watchdog_set(&wd, dev);
1754         device_lock(dev);
1755
1756         if (dev->pm_domain) {
1757                 info = "power domain ";
1758                 callback = pm_op(&dev->pm_domain->ops, state);
1759                 goto Run;
1760         }
1761
1762         if (dev->type && dev->type->pm) {
1763                 info = "type ";
1764                 callback = pm_op(dev->type->pm, state);
1765                 goto Run;
1766         }
1767
1768         if (dev->class && dev->class->pm) {
1769                 info = "class ";
1770                 callback = pm_op(dev->class->pm, state);
1771                 goto Run;
1772         }
1773
1774         if (dev->bus) {
1775                 if (dev->bus->pm) {
1776                         info = "bus ";
1777                         callback = pm_op(dev->bus->pm, state);
1778                 } else if (dev->bus->suspend) {
1779                         pm_dev_dbg(dev, state, "legacy bus ");
1780                         error = legacy_suspend(dev, state, dev->bus->suspend,
1781                                                 "legacy bus ");
1782                         goto End;
1783                 }
1784         }
1785
1786  Run:
1787         if (!callback && dev->driver && dev->driver->pm) {
1788                 info = "driver ";
1789                 callback = pm_op(dev->driver->pm, state);
1790         }
1791
1792         error = dpm_run_callback(callback, dev, state, info);
1793
1794  End:
1795         if (!error) {
1796                 dev->power.is_suspended = true;
1797                 if (device_may_wakeup(dev))
1798                         dev->power.wakeup_path = true;
1799
1800                 dpm_propagate_wakeup_to_parent(dev);
1801                 dpm_clear_superiors_direct_complete(dev);
1802         }
1803
1804         device_unlock(dev);
1805         dpm_watchdog_clear(&wd);
1806
1807  Complete:
1808         if (error)
1809                 async_error = error;
1810
1811         complete_all(&dev->power.completion);
1812         TRACE_SUSPEND(error);
1813         return error;
1814 }
1815
1816 static void async_suspend(void *data, async_cookie_t cookie)
1817 {
1818         struct device *dev = (struct device *)data;
1819         int error;
1820
1821         error = __device_suspend(dev, pm_transition, true);
1822         if (error) {
1823                 dpm_save_failed_dev(dev_name(dev));
1824                 pm_dev_err(dev, pm_transition, " async", error);
1825         }
1826
1827         put_device(dev);
1828 }
1829
1830 static int device_suspend(struct device *dev)
1831 {
1832         reinit_completion(&dev->power.completion);
1833
1834         if (is_async(dev)) {
1835                 get_device(dev);
1836                 async_schedule(async_suspend, dev);
1837                 return 0;
1838         }
1839
1840         return __device_suspend(dev, pm_transition, false);
1841 }
1842
1843 /**
1844  * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
1845  * @state: PM transition of the system being carried out.
1846  */
1847 int dpm_suspend(pm_message_t state)
1848 {
1849         ktime_t starttime = ktime_get();
1850         int error = 0;
1851
1852         trace_suspend_resume(TPS("dpm_suspend"), state.event, true);
1853         might_sleep();
1854
1855         cpufreq_suspend();
1856
1857         mutex_lock(&dpm_list_mtx);
1858         pm_transition = state;
1859         async_error = 0;
1860         while (!list_empty(&dpm_prepared_list)) {
1861                 struct device *dev = to_device(dpm_prepared_list.prev);
1862
1863                 get_device(dev);
1864                 mutex_unlock(&dpm_list_mtx);
1865
1866                 error = device_suspend(dev);
1867
1868                 mutex_lock(&dpm_list_mtx);
1869                 if (error) {
1870                         pm_dev_err(dev, state, "", error);
1871                         dpm_save_failed_dev(dev_name(dev));
1872                         put_device(dev);
1873                         break;
1874                 }
1875                 if (!list_empty(&dev->power.entry))
1876                         list_move(&dev->power.entry, &dpm_suspended_list);
1877                 put_device(dev);
1878                 if (async_error)
1879                         break;
1880         }
1881         mutex_unlock(&dpm_list_mtx);
1882         async_synchronize_full();
1883         if (!error)
1884                 error = async_error;
1885         if (error) {
1886                 suspend_stats.failed_suspend++;
1887                 dpm_save_failed_step(SUSPEND_SUSPEND);
1888         }
1889         dpm_show_time(starttime, state, error, NULL);
1890         trace_suspend_resume(TPS("dpm_suspend"), state.event, false);
1891         return error;
1892 }
1893
1894 /**
1895  * device_prepare - Prepare a device for system power transition.
1896  * @dev: Device to handle.
1897  * @state: PM transition of the system being carried out.
1898  *
1899  * Execute the ->prepare() callback(s) for given device.  No new children of the
1900  * device may be registered after this function has returned.
1901  */
1902 static int device_prepare(struct device *dev, pm_message_t state)
1903 {
1904         int (*callback)(struct device *) = NULL;
1905         int ret = 0;
1906
1907         if (dev->power.syscore)
1908                 return 0;
1909
1910         WARN_ON(!pm_runtime_enabled(dev) &&
1911                 dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND |
1912                                               DPM_FLAG_LEAVE_SUSPENDED));
1913
1914         /*
1915          * If a device's parent goes into runtime suspend at the wrong time,
1916          * it won't be possible to resume the device.  To prevent this we
1917          * block runtime suspend here, during the prepare phase, and allow
1918          * it again during the complete phase.
1919          */
1920         pm_runtime_get_noresume(dev);
1921
1922         device_lock(dev);
1923
1924         dev->power.wakeup_path = false;
1925
1926         if (dev->power.no_pm_callbacks) {
1927                 ret = 1;        /* Let device go direct_complete */
1928                 goto unlock;
1929         }
1930
1931         if (dev->pm_domain)
1932                 callback = dev->pm_domain->ops.prepare;
1933         else if (dev->type && dev->type->pm)
1934                 callback = dev->type->pm->prepare;
1935         else if (dev->class && dev->class->pm)
1936                 callback = dev->class->pm->prepare;
1937         else if (dev->bus && dev->bus->pm)
1938                 callback = dev->bus->pm->prepare;
1939
1940         if (!callback && dev->driver && dev->driver->pm)
1941                 callback = dev->driver->pm->prepare;
1942
1943         if (callback)
1944                 ret = callback(dev);
1945
1946 unlock:
1947         device_unlock(dev);
1948
1949         if (ret < 0) {
1950                 suspend_report_result(callback, ret);
1951                 pm_runtime_put(dev);
1952                 return ret;
1953         }
1954         /*
1955          * A positive return value from ->prepare() means "this device appears
1956          * to be runtime-suspended and its state is fine, so if it really is
1957          * runtime-suspended, you can leave it in that state provided that you
1958          * will do the same thing with all of its descendants".  This only
1959          * applies to suspend transitions, however.
1960          */
1961         spin_lock_irq(&dev->power.lock);
1962         dev->power.direct_complete = state.event == PM_EVENT_SUSPEND &&
1963                 pm_runtime_suspended(dev) && ret > 0 &&
1964                 !dev_pm_test_driver_flags(dev, DPM_FLAG_NEVER_SKIP);
1965         spin_unlock_irq(&dev->power.lock);
1966         return 0;
1967 }
1968
1969 /**
1970  * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
1971  * @state: PM transition of the system being carried out.
1972  *
1973  * Execute the ->prepare() callback(s) for all devices.
1974  */
1975 int dpm_prepare(pm_message_t state)
1976 {
1977         int error = 0;
1978
1979         trace_suspend_resume(TPS("dpm_prepare"), state.event, true);
1980         might_sleep();
1981
1982         /*
1983          * Give a chance for the known devices to complete their probes, before
1984          * disable probing of devices. This sync point is important at least
1985          * at boot time + hibernation restore.
1986          */
1987         wait_for_device_probe();
1988         /*
1989          * It is unsafe if probing of devices will happen during suspend or
1990          * hibernation and system behavior will be unpredictable in this case.
1991          * So, let's prohibit device's probing here and defer their probes
1992          * instead. The normal behavior will be restored in dpm_complete().
1993          */
1994         device_block_probing();
1995
1996         mutex_lock(&dpm_list_mtx);
1997         while (!list_empty(&dpm_list)) {
1998                 struct device *dev = to_device(dpm_list.next);
1999
2000                 get_device(dev);
2001                 mutex_unlock(&dpm_list_mtx);
2002
2003                 trace_device_pm_callback_start(dev, "", state.event);
2004                 error = device_prepare(dev, state);
2005                 trace_device_pm_callback_end(dev, error);
2006
2007                 mutex_lock(&dpm_list_mtx);
2008                 if (error) {
2009                         if (error == -EAGAIN) {
2010                                 put_device(dev);
2011                                 error = 0;
2012                                 continue;
2013                         }
2014                         printk(KERN_INFO "PM: Device %s not prepared "
2015                                 "for power transition: code %d\n",
2016                                 dev_name(dev), error);
2017                         put_device(dev);
2018                         break;
2019                 }
2020                 dev->power.is_prepared = true;
2021                 if (!list_empty(&dev->power.entry))
2022                         list_move_tail(&dev->power.entry, &dpm_prepared_list);
2023                 put_device(dev);
2024         }
2025         mutex_unlock(&dpm_list_mtx);
2026         trace_suspend_resume(TPS("dpm_prepare"), state.event, false);
2027         return error;
2028 }
2029
2030 /**
2031  * dpm_suspend_start - Prepare devices for PM transition and suspend them.
2032  * @state: PM transition of the system being carried out.
2033  *
2034  * Prepare all non-sysdev devices for system PM transition and execute "suspend"
2035  * callbacks for them.
2036  */
2037 int dpm_suspend_start(pm_message_t state)
2038 {
2039         int error;
2040
2041         error = dpm_prepare(state);
2042         if (error) {
2043                 suspend_stats.failed_prepare++;
2044                 dpm_save_failed_step(SUSPEND_PREPARE);
2045         } else
2046                 error = dpm_suspend(state);
2047         return error;
2048 }
2049 EXPORT_SYMBOL_GPL(dpm_suspend_start);
2050
2051 void __suspend_report_result(const char *function, void *fn, int ret)
2052 {
2053         if (ret)
2054                 printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
2055 }
2056 EXPORT_SYMBOL_GPL(__suspend_report_result);
2057
2058 /**
2059  * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
2060  * @dev: Device to wait for.
2061  * @subordinate: Device that needs to wait for @dev.
2062  */
2063 int device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
2064 {
2065         dpm_wait(dev, subordinate->power.async_suspend);
2066         return async_error;
2067 }
2068 EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
2069
2070 /**
2071  * dpm_for_each_dev - device iterator.
2072  * @data: data for the callback.
2073  * @fn: function to be called for each device.
2074  *
2075  * Iterate over devices in dpm_list, and call @fn for each device,
2076  * passing it @data.
2077  */
2078 void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
2079 {
2080         struct device *dev;
2081
2082         if (!fn)
2083                 return;
2084
2085         device_pm_lock();
2086         list_for_each_entry(dev, &dpm_list, power.entry)
2087                 fn(dev, data);
2088         device_pm_unlock();
2089 }
2090 EXPORT_SYMBOL_GPL(dpm_for_each_dev);
2091
2092 static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
2093 {
2094         if (!ops)
2095                 return true;
2096
2097         return !ops->prepare &&
2098                !ops->suspend &&
2099                !ops->suspend_late &&
2100                !ops->suspend_noirq &&
2101                !ops->resume_noirq &&
2102                !ops->resume_early &&
2103                !ops->resume &&
2104                !ops->complete;
2105 }
2106
2107 void device_pm_check_callbacks(struct device *dev)
2108 {
2109         spin_lock_irq(&dev->power.lock);
2110         dev->power.no_pm_callbacks =
2111                 (!dev->bus || (pm_ops_is_empty(dev->bus->pm) &&
2112                  !dev->bus->suspend && !dev->bus->resume)) &&
2113                 (!dev->class || pm_ops_is_empty(dev->class->pm)) &&
2114                 (!dev->type || pm_ops_is_empty(dev->type->pm)) &&
2115                 (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
2116                 (!dev->driver || (pm_ops_is_empty(dev->driver->pm) &&
2117                  !dev->driver->suspend && !dev->driver->resume));
2118         spin_unlock_irq(&dev->power.lock);
2119 }
2120
2121 bool dev_pm_smart_suspend_and_suspended(struct device *dev)
2122 {
2123         return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) &&
2124                 pm_runtime_status_suspended(dev);
2125 }