Merge back earlier 'pm-runtime' material for 3.19-rc1.

1 files changed, 33 insertions, 36 deletions

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 67c7938e430b..8f1ab8446caa 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -13,42 +13,39 @@
 #include <trace/events/rpm.h>
 #include "power.h"
 
-#define RPM_GET_CALLBACK(dev, cb)                               \
-({                                                              \
-        int (*__rpm_cb)(struct device *__d);                    \
-                                                                \
-        if (dev->pm_domain)                                     \
-                __rpm_cb = dev->pm_domain->ops.cb;              \
-        else if (dev->type && dev->type->pm)                    \
-                __rpm_cb = dev->type->pm->cb;                   \
-        else if (dev->class && dev->class->pm)                  \
-                __rpm_cb = dev->class->pm->cb;                  \
-        else if (dev->bus && dev->bus->pm)                      \
-                __rpm_cb = dev->bus->pm->cb;                    \
-        else                                                    \
-                __rpm_cb = NULL;                                \
-                                                                \
-        if (!__rpm_cb && dev->driver && dev->driver->pm)        \
-                __rpm_cb = dev->driver->pm->cb;                 \
-                                                                \
-        __rpm_cb;                                               \
-})
-
-static int (*rpm_get_suspend_cb(struct device *dev))(struct device *)
-{
-        return RPM_GET_CALLBACK(dev, runtime_suspend);
-}
+typedef int (*pm_callback_t)(struct device *);
 
-static int (*rpm_get_resume_cb(struct device *dev))(struct device *)
+static pm_callback_t __rpm_get_callback(struct device *dev, size_t cb_offset)
 {
-        return RPM_GET_CALLBACK(dev, runtime_resume);
+        pm_callback_t cb;
+        const struct dev_pm_ops *ops;
+
+        if (dev->pm_domain)
+                ops = &dev->pm_domain->ops;
+        else if (dev->type && dev->type->pm)
+                ops = dev->type->pm;
+        else if (dev->class && dev->class->pm)
+                ops = dev->class->pm;
+        else if (dev->bus && dev->bus->pm)
+                ops = dev->bus->pm;
+        else
+                ops = NULL;
+
+        if (ops)
+                cb = *(pm_callback_t *)((void *)ops + cb_offset);
+        else
+                cb = NULL;
+
+        if (!cb && dev->driver && dev->driver->pm)
+                cb = *(pm_callback_t *)((void *)dev->driver->pm + cb_offset);
+
+        return cb;
 }
 
+#define RPM_GET_CALLBACK(dev, callback) \
+                __rpm_get_callback(dev, offsetof(struct dev_pm_ops, callback))
+
 #ifdef CONFIG_PM_RUNTIME
-static int (*rpm_get_idle_cb(struct device *dev))(struct device *)
-{
-        return RPM_GET_CALLBACK(dev, runtime_idle);
-}
 
 static int rpm_resume(struct device *dev, int rpmflags);
 static int rpm_suspend(struct device *dev, int rpmflags);
@@ -347,7 +344,7 @@ static int rpm_idle(struct device *dev, int rpmflags)
 
         dev->power.idle_notification = true;
 
-        callback = rpm_get_idle_cb(dev);
+        callback = RPM_GET_CALLBACK(dev, runtime_idle);
 
         if (callback)
                 retval = __rpm_callback(callback, dev);
@@ -517,7 +514,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 
         __update_runtime_status(dev, RPM_SUSPENDING);
 
-        callback = rpm_get_suspend_cb(dev);
+        callback = RPM_GET_CALLBACK(dev, runtime_suspend);
 
         retval = rpm_callback(callback, dev);
         if (retval)
@@ -737,7 +734,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
 
         __update_runtime_status(dev, RPM_RESUMING);
 
-        callback = rpm_get_resume_cb(dev);
+        callback = RPM_GET_CALLBACK(dev, runtime_resume);
 
         retval = rpm_callback(callback, dev);
         if (retval) {
@@ -1431,7 +1428,7 @@ int pm_runtime_force_suspend(struct device *dev)
         if (pm_runtime_status_suspended(dev))
                 return 0;
 
-        callback = rpm_get_suspend_cb(dev);
+        callback = RPM_GET_CALLBACK(dev, runtime_suspend);
 
         if (!callback) {
                 ret = -ENOSYS;
@@ -1467,7 +1464,7 @@ int pm_runtime_force_resume(struct device *dev)
         int (*callback)(struct device *);
         int ret = 0;
 
-        callback = rpm_get_resume_cb(dev);
+        callback = RPM_GET_CALLBACK(dev, runtime_resume);
 
         if (!callback) {
                 ret = -ENOSYS;