1 files changed, 13 insertions, 10 deletions

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 846d89e3d122..5a01ecef4af3 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -185,6 +185,7 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq)
         }
 
         dev->power.runtime_status = RPM_SUSPENDING;
+        dev->power.deferred_resume = false;
 
         if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) {
                 spin_unlock_irq(&dev->power.lock);
@@ -200,7 +201,6 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq)
         if (retval) {
                 dev->power.runtime_status = RPM_ACTIVE;
                 pm_runtime_cancel_pending(dev);
-                dev->power.deferred_resume = false;
 
                 if (retval == -EAGAIN || retval == -EBUSY) {
                         notify = true;
@@ -217,7 +217,6 @@ int __pm_runtime_suspend(struct device *dev, bool from_wq)
         wake_up_all(&dev->power.wait_queue);
 
         if (dev->power.deferred_resume) {
-                dev->power.deferred_resume = false;
                 __pm_runtime_resume(dev, false);
                 retval = -EAGAIN;
                 goto out;
@@ -626,6 +625,8 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
                 goto out;
 
         dev->power.timer_expires = jiffies + msecs_to_jiffies(delay);
+        if (!dev->power.timer_expires)
+                dev->power.timer_expires = 1;
         mod_timer(&dev->power.suspend_timer, dev->power.timer_expires);
 
  out:
@@ -659,13 +660,17 @@ static int __pm_request_resume(struct device *dev)
 
         pm_runtime_deactivate_timer(dev);
 
+        if (dev->power.runtime_status == RPM_SUSPENDING) {
+                dev->power.deferred_resume = true;
+                return retval;
+        }
         if (dev->power.request_pending) {
                 /* If non-resume request is pending, we can overtake it. */
                 dev->power.request = retval ? RPM_REQ_NONE : RPM_REQ_RESUME;
                 return retval;
-        } else if (retval) {
-                return retval;
         }
+        if (retval)
+                return retval;
 
         dev->power.request = RPM_REQ_RESUME;
         dev->power.request_pending = true;
@@ -777,7 +782,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
         }
 
         if (parent) {
-                spin_lock(&parent->power.lock);
+                spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING);
 
                 /*
                  * It is invalid to put an active child under a parent that is
@@ -786,12 +791,10 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
                  */
                 if (!parent->power.disable_depth
                     && !parent->power.ignore_children
-                    && parent->power.runtime_status != RPM_ACTIVE) {
+                    && parent->power.runtime_status != RPM_ACTIVE)
                         error = -EBUSY;
-                } else {
-                        if (dev->power.runtime_status == RPM_SUSPENDED)
-                                atomic_inc(&parent->power.child_count);
-                }
+                else if (dev->power.runtime_status == RPM_SUSPENDED)
+                        atomic_inc(&parent->power.child_count);
 
                 spin_unlock(&parent->power.lock);