3 files changed, 41 insertions, 15 deletions

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 8aa2443182d5..1a216c114a0f 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -23,8 +23,8 @@
 #include <linux/pm.h>
 #include <linux/pm_runtime.h>
 #include <linux/resume-trace.h>
-#include <linux/rwsem.h>
 #include <linux/interrupt.h>
+#include <linux/sched.h>
 
 #include "../base.h"
 #include "power.h"
@@ -172,6 +172,13 @@ static int pm_op(struct device *dev,
                  pm_message_t state)
 {
         int error = 0;
+        ktime_t calltime, delta, rettime;
+
+        if (initcall_debug) {
+                pr_info("calling  %s+ @ %i\n",
+                                dev_name(dev), task_pid_nr(current));
+                calltime = ktime_get();
+        }
 
         switch (state.event) {
 #ifdef CONFIG_SUSPEND
@@ -219,6 +226,14 @@ static int pm_op(struct device *dev,
         default:
                 error = -EINVAL;
         }
+
+        if (initcall_debug) {
+                rettime = ktime_get();
+                delta = ktime_sub(rettime, calltime);
+                pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
+                        error, (unsigned long long)ktime_to_ns(delta) >> 10);
+        }
+
         return error;
 }
 
@@ -236,6 +251,13 @@ static int pm_noirq_op(struct device *dev,
                         pm_message_t state)
 {
         int error = 0;
+        ktime_t calltime, delta, rettime;
+
+        if (initcall_debug) {
+                pr_info("calling  %s_i+ @ %i\n",
+                                dev_name(dev), task_pid_nr(current));
+                calltime = ktime_get();
+        }
 
         switch (state.event) {
 #ifdef CONFIG_SUSPEND
@@ -283,6 +305,14 @@ static int pm_noirq_op(struct device *dev,
         default:
                 error = -EINVAL;
         }
+
+        if (initcall_debug) {
+                rettime = ktime_get();
+                delta = ktime_sub(rettime, calltime);
+                printk("initcall %s_i+ returned %d after %Ld usecs\n", dev_name(dev),
+                        error, (unsigned long long)ktime_to_ns(delta) >> 10);
+        }
+
         return error;
 }
 
@@ -341,14 +371,11 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
         TRACE_DEVICE(dev);
         TRACE_RESUME(0);
 
-        if (!dev->bus)
-                goto End;
-
-        if (dev->bus->pm) {
+        if (dev->bus && dev->bus->pm) {
                 pm_dev_dbg(dev, state, "EARLY ");
                 error = pm_noirq_op(dev, dev->bus->pm, state);
         }
- End:
+
         TRACE_RESUME(error);
         return error;
 }
@@ -584,10 +611,7 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
 {
         int error = 0;
 
-        if (!dev->bus)
-                return 0;
-
-        if (dev->bus->pm) {
+        if (dev->bus && dev->bus->pm) {
                 pm_dev_dbg(dev, state, "LATE ");
                 error = pm_noirq_op(dev, dev->bus->pm, state);
         }
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 5a01ecef4af3..40d7720a4b21 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -701,15 +701,15 @@ EXPORT_SYMBOL_GPL(pm_request_resume);
  * @dev: Device to handle.
  * @sync: If set and the device is suspended, resume it synchronously.
  *
- * Increment the usage count of the device and if it was zero previously,
- * resume it or submit a resume request for it, depending on the value of @sync.
+ * Increment the usage count of the device and resume it or submit a resume
+ * request for it, depending on the value of @sync.
  */
 int __pm_runtime_get(struct device *dev, bool sync)
 {
-        int retval = 1;
+        int retval;
 
-        if (atomic_add_return(1, &dev->power.usage_count) == 1)
-                retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
+        atomic_inc(&dev->power.usage_count);
+        retval = sync ? pm_runtime_resume(dev) : pm_request_resume(dev);
 
         return retval;
 }
diff --git a/include/linux/init.h b/include/linux/init.h
index ff8bde520d03..ab1d31f9352b 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -149,6 +149,8 @@ void prepare_namespace(void);
 
 extern void (*late_time_init)(void);
 
+extern int initcall_debug;
+
 #endif
   
 #ifndef MODULE