5 files changed, 90 insertions, 23 deletions

diff --git a/kernel/power/autosleep.c b/kernel/power/autosleep.c
index ca304046d9e2..c6422ffeda9a 100644
--- a/kernel/power/autosleep.c
+++ b/kernel/power/autosleep.c
@@ -66,7 +66,7 @@ static DECLARE_WORK(suspend_work, try_to_suspend);
 
 void queue_up_suspend_work(void)
 {
-        if (!work_pending(&suspend_work) && autosleep_state > PM_SUSPEND_ON)
+        if (autosleep_state > PM_SUSPEND_ON)
                 queue_work(autosleep_wq, &suspend_work);
 }
 
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 1c16f9167de1..d77663bfedeb 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -313,7 +313,7 @@ static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
 static suspend_state_t decode_state(const char *buf, size_t n)
 {
 #ifdef CONFIG_SUSPEND
-        suspend_state_t state = PM_SUSPEND_STANDBY;
+        suspend_state_t state = PM_SUSPEND_MIN;
         const char * const *s;
 #endif
         char *p;
@@ -553,6 +553,30 @@ power_attr(pm_trace_dev_match);
 
 #endif /* CONFIG_PM_TRACE */
 
+#ifdef CONFIG_FREEZER
+static ssize_t pm_freeze_timeout_show(struct kobject *kobj,
+                                      struct kobj_attribute *attr, char *buf)
+{
+        return sprintf(buf, "%u\n", freeze_timeout_msecs);
+}
+
+static ssize_t pm_freeze_timeout_store(struct kobject *kobj,
+                                       struct kobj_attribute *attr,
+                                       const char *buf, size_t n)
+{
+        unsigned long val;
+
+        if (kstrtoul(buf, 10, &val))
+                return -EINVAL;
+
+        freeze_timeout_msecs = val;
+        return n;
+}
+
+power_attr(pm_freeze_timeout);
+
+#endif  /* CONFIG_FREEZER*/
+
 static struct attribute * g[] = {
         &state_attr.attr,
 #ifdef CONFIG_PM_TRACE
@@ -576,6 +600,9 @@ static struct attribute * g[] = {
         &pm_print_times_attr.attr,
 #endif
 #endif
+#ifdef CONFIG_FREEZER
+        &pm_freeze_timeout_attr.attr,
+#endif
         NULL,
 };
 
diff --git a/kernel/power/process.c b/kernel/power/process.c
index d5a258b60c6f..98088e0e71e8 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -21,7 +21,7 @@
 /* 
  * Timeout for stopping processes
  */
-#define TIMEOUT (20 * HZ)
+unsigned int __read_mostly freeze_timeout_msecs = 20 * MSEC_PER_SEC;
 
 static int try_to_freeze_tasks(bool user_only)
 {
@@ -36,7 +36,7 @@ static int try_to_freeze_tasks(bool user_only)
 
         do_gettimeofday(&start);
 
-        end_time = jiffies + TIMEOUT;
+        end_time = jiffies + msecs_to_jiffies(freeze_timeout_msecs);
 
         if (!user_only)
                 freeze_workqueues_begin();
diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 9322ff7eaad6..587dddeebf15 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -359,8 +359,7 @@ void pm_qos_update_request(struct pm_qos_request *req,
                 return;
         }
 
-        if (delayed_work_pending(&req->work))
-                cancel_delayed_work_sync(&req->work);
+        cancel_delayed_work_sync(&req->work);
 
         if (new_value != req->node.prio)
                 pm_qos_update_target(
@@ -386,8 +385,7 @@ void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,
                  "%s called for unknown object.", __func__))
                 return;
 
-        if (delayed_work_pending(&req->work))
-                cancel_delayed_work_sync(&req->work);
+        cancel_delayed_work_sync(&req->work);
 
         if (new_value != req->node.prio)
                 pm_qos_update_target(
@@ -416,8 +414,7 @@ void pm_qos_remove_request(struct pm_qos_request *req)
                 return;
         }
 
-        if (delayed_work_pending(&req->work))
-                cancel_delayed_work_sync(&req->work);
+        cancel_delayed_work_sync(&req->work);
 
         pm_qos_update_target(pm_qos_array[req->pm_qos_class]->constraints,
                              &req->node, PM_QOS_REMOVE_REQ,
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index c8b7446b27df..d4feda084a3a 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -30,12 +30,38 @@
 #include "power.h"
 
 const char *const pm_states[PM_SUSPEND_MAX] = {
+        [PM_SUSPEND_FREEZE]     = "freeze",
         [PM_SUSPEND_STANDBY]    = "standby",
         [PM_SUSPEND_MEM]        = "mem",
 };
 
 static const struct platform_suspend_ops *suspend_ops;
 
+static bool need_suspend_ops(suspend_state_t state)
+{
+        return !!(state > PM_SUSPEND_FREEZE);
+}
+
+static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head);
+static bool suspend_freeze_wake;
+
+static void freeze_begin(void)
+{
+        suspend_freeze_wake = false;
+}
+
+static void freeze_enter(void)
+{
+        wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
+}
+
+void freeze_wake(void)
+{
+        suspend_freeze_wake = true;
+        wake_up(&suspend_freeze_wait_head);
+}
+EXPORT_SYMBOL_GPL(freeze_wake);
+
 /**
  * suspend_set_ops - Set the global suspend method table.
  * @ops: Suspend operations to use.
@@ -50,8 +76,11 @@ EXPORT_SYMBOL_GPL(suspend_set_ops);
 
 bool valid_state(suspend_state_t state)
 {
+        if (state == PM_SUSPEND_FREEZE)
+                return true;
         /*
-         * All states need lowlevel support and need to be valid to the lowlevel
+         * PM_SUSPEND_STANDBY and PM_SUSPEND_MEMORY states need lowlevel
+         * support and need to be valid to the lowlevel
          * implementation, no valid callback implies that none are valid.
          */
         return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
@@ -89,11 +118,11 @@ static int suspend_test(int level)
  * hibernation).  Run suspend notifiers, allocate the "suspend" console and
  * freeze processes.
  */
-static int suspend_prepare(void)
+static int suspend_prepare(suspend_state_t state)
 {
         int error;
 
-        if (!suspend_ops || !suspend_ops->enter)
+        if (need_suspend_ops(state) && (!suspend_ops || !suspend_ops->enter))
                 return -EPERM;
 
         pm_prepare_console();
@@ -137,7 +166,7 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
 {
         int error;
 
-        if (suspend_ops->prepare) {
+        if (need_suspend_ops(state) && suspend_ops->prepare) {
                 error = suspend_ops->prepare();
                 if (error)
                         goto Platform_finish;
@@ -149,12 +178,23 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
                 goto Platform_finish;
         }
 
-        if (suspend_ops->prepare_late) {
+        if (need_suspend_ops(state) && suspend_ops->prepare_late) {
                 error = suspend_ops->prepare_late();
                 if (error)
                         goto Platform_wake;
         }
 
+        /*
+         * PM_SUSPEND_FREEZE equals
+         * frozen processes + suspended devices + idle processors.
+         * Thus we should invoke freeze_enter() soon after
+         * all the devices are suspended.
+         */
+        if (state == PM_SUSPEND_FREEZE) {
+                freeze_enter();
+                goto Platform_wake;
+        }
+
         if (suspend_test(TEST_PLATFORM))
                 goto Platform_wake;
 
@@ -182,13 +222,13 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
         enable_nonboot_cpus();
 
  Platform_wake:
-        if (suspend_ops->wake)
+        if (need_suspend_ops(state) && suspend_ops->wake)
                 suspend_ops->wake();
 
         dpm_resume_start(PMSG_RESUME);
 
  Platform_finish:
-        if (suspend_ops->finish)
+        if (need_suspend_ops(state) && suspend_ops->finish)
                 suspend_ops->finish();
 
         return error;
@@ -203,11 +243,11 @@ int suspend_devices_and_enter(suspend_state_t state)
         int error;
         bool wakeup = false;
 
-        if (!suspend_ops)
+        if (need_suspend_ops(state) && !suspend_ops)
                 return -ENOSYS;
 
         trace_machine_suspend(state);
-        if (suspend_ops->begin) {
+        if (need_suspend_ops(state) && suspend_ops->begin) {
                 error = suspend_ops->begin(state);
                 if (error)
                         goto Close;
@@ -226,7 +266,7 @@ int suspend_devices_and_enter(suspend_state_t state)
 
         do {
                 error = suspend_enter(state, &wakeup);
-        } while (!error && !wakeup
+        } while (!error && !wakeup && need_suspend_ops(state)
                 && suspend_ops->suspend_again && suspend_ops->suspend_again());
 
  Resume_devices:
@@ -236,13 +276,13 @@ int suspend_devices_and_enter(suspend_state_t state)
         ftrace_start();
         resume_console();
  Close:
-        if (suspend_ops->end)
+        if (need_suspend_ops(state) && suspend_ops->end)
                 suspend_ops->end();
         trace_machine_suspend(PWR_EVENT_EXIT);
         return error;
 
  Recover_platform:
-        if (suspend_ops->recover)
+        if (need_suspend_ops(state) && suspend_ops->recover)
                 suspend_ops->recover();
         goto Resume_devices;
 }
@@ -278,12 +318,15 @@ static int enter_state(suspend_state_t state)
         if (!mutex_trylock(&pm_mutex))
                 return -EBUSY;
 
+        if (state == PM_SUSPEND_FREEZE)
+                freeze_begin();
+
         printk(KERN_INFO "PM: Syncing filesystems ... ");
         sys_sync();
         printk("done.\n");
 
         pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
-        error = suspend_prepare();
+        error = suspend_prepare(state);
         if (error)
                 goto Unlock;