Merge tag 'pm-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates for 3.4 from Rafael Wysocki:
 "Assorted extensions and fixes including:

  * Introduction of early/late suspend/hibernation device callbacks.
  * Generic PM domains extensions and fixes.
  * devfreq updates from Axel Lin and MyungJoo Ham.
  * Device PM QoS updates.
  * Fixes of concurrency problems with wakeup sources.
  * System suspend and hibernation fixes."

* tag 'pm-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (43 commits)
  PM / Domains: Check domain status during hibernation restore of devices
  PM / devfreq: add relation of recommended frequency.
  PM / shmobile: Make MTU2 driver use pm_genpd_dev_always_on()
  PM / shmobile: Make CMT driver use pm_genpd_dev_always_on()
  PM / shmobile: Make TMU driver use pm_genpd_dev_always_on()
  PM / Domains: Introduce "always on" device flag
  PM / Domains: Fix hibernation restore of devices, v2
  PM / Domains: Fix handling of wakeup devices during system resume
  sh_mmcif / PM: Use PM QoS latency constraint
  tmio_mmc / PM: Use PM QoS latency constraint
  PM / QoS: Make it possible to expose PM QoS latency constraints
  PM / Sleep: JBD and JBD2 missing set_freezable()
  PM / Domains: Fix include for PM_GENERIC_DOMAINS=n case
  PM / Freezer: Remove references to TIF_FREEZE in comments
  PM / Sleep: Add more wakeup source initialization routines
  PM / Hibernate: Enable usermodehelpers in hibernate() error path
  PM / Sleep: Make __pm_stay_awake() delete wakeup source timers
  PM / Sleep: Fix race conditions related to wakeup source timer function
  PM / Sleep: Fix possible infinite loop during wakeup source destruction
  PM / Hibernate: print physical addresses consistently with other parts of kernel
  ...

9 files changed, 108 insertions, 119 deletions

diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 07e0e28ffba7..66d808ec5252 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,7 +1,8 @@
 
 ccflags-$(CONFIG_PM_DEBUG)      := -DDEBUG
 
-obj-$(CONFIG_PM)                += main.o qos.o
+obj-y                           += qos.o
+obj-$(CONFIG_PM)                += main.o
 obj-$(CONFIG_VT_CONSOLE_SLEEP)  += console.o
 obj-$(CONFIG_FREEZER)           += process.o
 obj-$(CONFIG_SUSPEND)           += suspend.o
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 6d6d28870335..0a186cfde788 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -245,8 +245,8 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop,
  * create_image - Create a hibernation image.
  * @platform_mode: Whether or not to use the platform driver.
  *
- * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
- * and execute the drivers' .thaw_noirq() callbacks.
+ * Execute device drivers' "late" and "noirq" freeze callbacks, create a
+ * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
  *
  * Control reappears in this routine after the subsequent restore.
  */
@@ -254,7 +254,7 @@ static int create_image(int platform_mode)
 {
         int error;
 
-        error = dpm_suspend_noirq(PMSG_FREEZE);
+        error = dpm_suspend_end(PMSG_FREEZE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting hibernation\n");
@@ -306,7 +306,7 @@ static int create_image(int platform_mode)
  Platform_finish:
         platform_finish(platform_mode);
 
-        dpm_resume_noirq(in_suspend ?
+        dpm_resume_start(in_suspend ?
                 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
 
         return error;
@@ -343,13 +343,13 @@ int hibernation_snapshot(int platform_mode)
                  * successful freezer test.
                  */
                 freezer_test_done = true;
-                goto Cleanup;
+                goto Thaw;
         }
 
         error = dpm_prepare(PMSG_FREEZE);
         if (error) {
                 dpm_complete(PMSG_RECOVER);
-                goto Cleanup;
+                goto Thaw;
         }
 
         suspend_console();
@@ -385,6 +385,8 @@ int hibernation_snapshot(int platform_mode)
         platform_end(platform_mode);
         return error;
 
+ Thaw:
+        thaw_kernel_threads();
  Cleanup:
         swsusp_free();
         goto Close;
@@ -394,16 +396,16 @@ int hibernation_snapshot(int platform_mode)
  * resume_target_kernel - Restore system state from a hibernation image.
  * @platform_mode: Whether or not to use the platform driver.
  *
- * Execute device drivers' .freeze_noirq() callbacks, restore the contents of
- * highmem that have not been restored yet from the image and run the low-level
- * code that will restore the remaining contents of memory and switch to the
- * just restored target kernel.
+ * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
+ * contents of highmem that have not been restored yet from the image and run
+ * the low-level code that will restore the remaining contents of memory and
+ * switch to the just restored target kernel.
  */
 static int resume_target_kernel(bool platform_mode)
 {
         int error;
 
-        error = dpm_suspend_noirq(PMSG_QUIESCE);
+        error = dpm_suspend_end(PMSG_QUIESCE);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down, "
                         "aborting resume\n");
@@ -460,7 +462,7 @@ static int resume_target_kernel(bool platform_mode)
  Cleanup:
         platform_restore_cleanup(platform_mode);
 
-        dpm_resume_noirq(PMSG_RECOVER);
+        dpm_resume_start(PMSG_RECOVER);
 
         return error;
 }
@@ -518,7 +520,7 @@ int hibernation_platform_enter(void)
                 goto Resume_devices;
         }
 
-        error = dpm_suspend_noirq(PMSG_HIBERNATE);
+        error = dpm_suspend_end(PMSG_HIBERNATE);
         if (error)
                 goto Resume_devices;
 
@@ -549,7 +551,7 @@ int hibernation_platform_enter(void)
  Platform_finish:
         hibernation_ops->finish();
 
-        dpm_resume_noirq(PMSG_RESTORE);
+        dpm_resume_start(PMSG_RESTORE);
 
  Resume_devices:
         entering_platform_hibernation = false;
@@ -616,7 +618,7 @@ int hibernate(void)
         /* Allocate memory management structures */
         error = create_basic_memory_bitmaps();
         if (error)
-                goto Exit;
+                goto Enable_umh;
 
         printk(KERN_INFO "PM: Syncing filesystems ... ");
         sys_sync();
@@ -624,15 +626,11 @@ int hibernate(void)
 
         error = freeze_processes();
         if (error)
-                goto Finish;
+                goto Free_bitmaps;
 
         error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
-        if (error)
-                goto Thaw;
-        if (freezer_test_done) {
-                freezer_test_done = false;
+        if (error || freezer_test_done)
                 goto Thaw;
-        }
 
         if (in_suspend) {
                 unsigned int flags = 0;
@@ -657,8 +655,13 @@ int hibernate(void)
 
  Thaw:
         thaw_processes();
- Finish:
+
+        /* Don't bother checking whether freezer_test_done is true */
+        freezer_test_done = false;
+
+ Free_bitmaps:
         free_basic_memory_bitmaps();
+ Enable_umh:
         usermodehelper_enable();
  Exit:
         pm_notifier_call_chain(PM_POST_HIBERNATION);
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 9824b41e5a18..1c12581f1c62 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -165,16 +165,20 @@ static int suspend_stats_show(struct seq_file *s, void *unused)
         last_errno %= REC_FAILED_NUM;
         last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1;
         last_step %= REC_FAILED_NUM;
-        seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
-                        "%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
+        seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n"
+                        "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n",
                         "success", suspend_stats.success,
                         "fail", suspend_stats.fail,
                         "failed_freeze", suspend_stats.failed_freeze,
                         "failed_prepare", suspend_stats.failed_prepare,
                         "failed_suspend", suspend_stats.failed_suspend,
+                        "failed_suspend_late",
+                                suspend_stats.failed_suspend_late,
                         "failed_suspend_noirq",
                                 suspend_stats.failed_suspend_noirq,
                         "failed_resume", suspend_stats.failed_resume,
+                        "failed_resume_early",
+                                suspend_stats.failed_resume_early,
                         "failed_resume_noirq",
                                 suspend_stats.failed_resume_noirq);
         seq_printf(s,   "failures:\n  last_failed_dev:\t%-s\n",
@@ -287,16 +291,10 @@ static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
 
 #ifdef CONFIG_SUSPEND
         for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
-                if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
+                if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
+                        error = pm_suspend(state);
                         break;
-        }
-        if (state < PM_SUSPEND_MAX && *s) {
-                error = enter_state(state);
-                if (error) {
-                        suspend_stats.fail++;
-                        dpm_save_failed_errno(error);
-                } else
-                        suspend_stats.success++;
+                }
         }
 #endif
 
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 21724eee5206..98f3622d7407 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -177,13 +177,11 @@ extern const char *const pm_states[];
 
 extern bool valid_state(suspend_state_t state);
 extern int suspend_devices_and_enter(suspend_state_t state);
-extern int enter_state(suspend_state_t state);
 #else /* !CONFIG_SUSPEND */
 static inline int suspend_devices_and_enter(suspend_state_t state)
 {
         return -ENOSYS;
 }
-static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
 static inline bool valid_state(suspend_state_t state) { return false; }
 #endif /* !CONFIG_SUSPEND */
 
@@ -234,16 +232,14 @@ static inline int suspend_freeze_processes(void)
         int error;
 
         error = freeze_processes();
-
         /*
          * freeze_processes() automatically thaws every task if freezing
          * fails. So we need not do anything extra upon error.
          */
         if (error)
-                goto Finish;
+                return error;
 
         error = freeze_kernel_threads();
-
         /*
          * freeze_kernel_threads() thaws only kernel threads upon freezing
          * failure. So we have to thaw the userspace tasks ourselves.
@@ -251,7 +247,6 @@ static inline int suspend_freeze_processes(void)
         if (error)
                 thaw_processes();
 
- Finish:
         return error;
 }
 
diff --git a/kernel/power/process.c b/kernel/power/process.c
index 7e426459e60a..0d2aeb226108 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -53,11 +53,9 @@ static int try_to_freeze_tasks(bool user_only)
                          * It is "frozen enough".  If the task does wake
                          * up, it will immediately call try_to_freeze.
                          *
-                         * Because freeze_task() goes through p's
-                         * scheduler lock after setting TIF_FREEZE, it's
-                         * guaranteed that either we see TASK_RUNNING or
-                         * try_to_stop() after schedule() in ptrace/signal
-                         * stop sees TIF_FREEZE.
+                         * Because freeze_task() goes through p's scheduler lock, it's
+                         * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
+                         * transition can't race with task state testing here.
                          */
                         if (!task_is_stopped_or_traced(p) &&
                             !freezer_should_skip(p))
@@ -98,13 +96,15 @@ static int try_to_freeze_tasks(bool user_only)
                        elapsed_csecs / 100, elapsed_csecs % 100,
                        todo - wq_busy, wq_busy);
 
-                read_lock(&tasklist_lock);
-                do_each_thread(g, p) {
-                        if (!wakeup && !freezer_should_skip(p) &&
-                            p != current && freezing(p) && !frozen(p))
-                                sched_show_task(p);
-                } while_each_thread(g, p);
-                read_unlock(&tasklist_lock);
+                if (!wakeup) {
+                        read_lock(&tasklist_lock);
+                        do_each_thread(g, p) {
+                                if (p != current && !freezer_should_skip(p)
+                                    && freezing(p) && !frozen(p))
+                                        sched_show_task(p);
+                        } while_each_thread(g, p);
+                        read_unlock(&tasklist_lock);
+                }
         } else {
                 printk("(elapsed %d.%02d seconds) ", elapsed_csecs / 100,
                         elapsed_csecs % 100);
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 995e3bd3417b..d6d6dbd1ecc0 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -469,21 +469,18 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
 static int __init pm_qos_power_init(void)
 {
         int ret = 0;
+        int i;
 
-        ret = register_pm_qos_misc(&cpu_dma_pm_qos);
-        if (ret < 0) {
-                printk(KERN_ERR "pm_qos_param: cpu_dma_latency setup failed\n");
-                return ret;
-        }
-        ret = register_pm_qos_misc(&network_lat_pm_qos);
-        if (ret < 0) {
-                printk(KERN_ERR "pm_qos_param: network_latency setup failed\n");
-                return ret;
+        BUILD_BUG_ON(ARRAY_SIZE(pm_qos_array) != PM_QOS_NUM_CLASSES);
+
+        for (i = 1; i < PM_QOS_NUM_CLASSES; i++) {
+                ret = register_pm_qos_misc(pm_qos_array[i]);
+                if (ret < 0) {
+                        printk(KERN_ERR "pm_qos_param: %s setup failed\n",
+                               pm_qos_array[i]->name);
+                        return ret;
+                }
         }
-        ret = register_pm_qos_misc(&network_throughput_pm_qos);
-        if (ret < 0)
-                printk(KERN_ERR
-                        "pm_qos_param: network_throughput setup failed\n");
 
         return ret;
 }
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 3a564ac85f36..0de28576807d 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -711,9 +711,10 @@ static void mark_nosave_pages(struct memory_bitmap *bm)
         list_for_each_entry(region, &nosave_regions, list) {
                 unsigned long pfn;
 
-                pr_debug("PM: Marking nosave pages: %016lx - %016lx\n",
-                                region->start_pfn << PAGE_SHIFT,
-                                region->end_pfn << PAGE_SHIFT);
+                pr_debug("PM: Marking nosave pages: [mem %#010llx-%#010llx]\n",
+                         (unsigned long long) region->start_pfn << PAGE_SHIFT,
+                         ((unsigned long long) region->end_pfn << PAGE_SHIFT)
+                                - 1);
 
                 for (pfn = region->start_pfn; pfn < region->end_pfn; pfn++)
                         if (pfn_valid(pfn)) {
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 4fd51beed879..88e5c967370d 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -37,8 +37,8 @@ const char *const pm_states[PM_SUSPEND_MAX] = {
 static const struct platform_suspend_ops *suspend_ops;
 
 /**
- *      suspend_set_ops - Set the global suspend method table.
- *      @ops:   Pointer to ops structure.
+ * suspend_set_ops - Set the global suspend method table.
+ * @ops: Suspend operations to use.
  */
 void suspend_set_ops(const struct platform_suspend_ops *ops)
 {
@@ -58,11 +58,11 @@ bool valid_state(suspend_state_t state)
 }
 
 /**
- * suspend_valid_only_mem - generic memory-only valid callback
+ * suspend_valid_only_mem - Generic memory-only valid callback.
  *
- * Platform drivers that implement mem suspend only and only need
- * to check for that in their .valid callback can use this instead
- * of rolling their own .valid callback.
+ * Platform drivers that implement mem suspend only and only need to check for
+ * that in their .valid() callback can use this instead of rolling their own
+ * .valid() callback.
  */
 int suspend_valid_only_mem(suspend_state_t state)
 {
@@ -83,10 +83,11 @@ static int suspend_test(int level)
 }
 
 /**
- *      suspend_prepare - Do prep work before entering low-power state.
+ * suspend_prepare - Prepare for entering system sleep state.
  *
- *      This is common code that is called for each state that we're entering.
- *      Run suspend notifiers, allocate a console and stop all processes.
+ * Common code run for every system sleep state that can be entered (except for
+ * hibernation).  Run suspend notifiers, allocate the "suspend" console and
+ * freeze processes.
  */
 static int suspend_prepare(void)
 {
@@ -131,9 +132,9 @@ void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
 }
 
 /**
- * suspend_enter - enter the desired system sleep state.
- * @state: State to enter
- * @wakeup: Returns information that suspend should not be entered again.
+ * suspend_enter - Make the system enter the given sleep state.
+ * @state: System sleep state to enter.
+ * @wakeup: Returns information that the sleep state should not be re-entered.
  *
  * This function should be called after devices have been suspended.
  */
@@ -147,7 +148,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
                         goto Platform_finish;
         }
 
-        error = dpm_suspend_noirq(PMSG_SUSPEND);
+        error = dpm_suspend_end(PMSG_SUSPEND);
         if (error) {
                 printk(KERN_ERR "PM: Some devices failed to power down\n");
                 goto Platform_finish;
@@ -189,7 +190,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
         if (suspend_ops->wake)
                 suspend_ops->wake();
 
-        dpm_resume_noirq(PMSG_RESUME);
+        dpm_resume_start(PMSG_RESUME);
 
  Platform_finish:
         if (suspend_ops->finish)
@@ -199,9 +200,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 }
 
 /**
- *      suspend_devices_and_enter - suspend devices and enter the desired system
- *                                  sleep state.
- *      @state:           state to enter
+ * suspend_devices_and_enter - Suspend devices and enter system sleep state.
+ * @state: System sleep state to enter.
  */
 int suspend_devices_and_enter(suspend_state_t state)
 {
@@ -251,10 +251,10 @@ int suspend_devices_and_enter(suspend_state_t state)
 }
 
 /**
- *      suspend_finish - Do final work before exiting suspend sequence.
+ * suspend_finish - Clean up before finishing the suspend sequence.
  *
- *      Call platform code to clean up, restart processes, and free the
- *      console that we've allocated. This is not called for suspend-to-disk.
+ * Call platform code to clean up, restart processes, and free the console that
+ * we've allocated. This routine is not called for hibernation.
  */
 static void suspend_finish(void)
 {
@@ -265,16 +265,14 @@ static void suspend_finish(void)
 }
 
 /**
- *      enter_state - Do common work of entering low-power state.
- *      @state:         pm_state structure for state we're entering.
+ * enter_state - Do common work needed to enter system sleep state.
+ * @state: System sleep state to enter.
  *
- *      Make sure we're the only ones trying to enter a sleep state. Fail
- *      if someone has beat us to it, since we don't want anything weird to
- *      happen when we wake up.
- *      Then, do the setup for suspend, enter the state, and cleaup (after
- *      we've woken up).
+ * Make sure that no one else is trying to put the system into a sleep state.
+ * Fail if that's not the case.  Otherwise, prepare for system suspend, make the
+ * system enter the given sleep state and clean up after wakeup.
  */
-int enter_state(suspend_state_t state)
+static int enter_state(suspend_state_t state)
 {
         int error;
 
@@ -310,24 +308,26 @@ int enter_state(suspend_state_t state)
 }
 
 /**
- *      pm_suspend - Externally visible function for suspending system.
- *      @state:         Enumerated value of state to enter.
+ * pm_suspend - Externally visible function for suspending the system.
+ * @state: System sleep state to enter.
  *
- *      Determine whether or not value is within range, get state
- *      structure, and enter (above).
+ * Check if the value of @state represents one of the supported states,
+ * execute enter_state() and update system suspend statistics.
  */
 int pm_suspend(suspend_state_t state)
 {
-        int ret;
-        if (state > PM_SUSPEND_ON && state < PM_SUSPEND_MAX) {
-                ret = enter_state(state);
-                if (ret) {
-                        suspend_stats.fail++;
-                        dpm_save_failed_errno(ret);
-                } else
-                        suspend_stats.success++;
-                return ret;
+        int error;
+
+        if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
+                return -EINVAL;
+
+        error = enter_state(state);
+        if (error) {
+                suspend_stats.fail++;
+                dpm_save_failed_errno(error);
+        } else {
+                suspend_stats.success++;
         }
-        return -EINVAL;
+        return error;
 }
 EXPORT_SYMBOL(pm_suspend);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 3e100075b13c..33c4329205af 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -249,16 +249,10 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
                 }
                 pm_restore_gfp_mask();
                 error = hibernation_snapshot(data->platform_support);
-                if (error) {
-                        thaw_kernel_threads();
-                } else {
+                if (!error) {
                         error = put_user(in_suspend, (int __user *)arg);
-                        if (!error && !freezer_test_done)
-                                data->ready = 1;
-                        if (freezer_test_done) {
-                                freezer_test_done = false;
-                                thaw_kernel_threads();
-                        }
+                        data->ready = !freezer_test_done && !error;
+                        freezer_test_done = false;
                 }
                 break;