[PATCH 1/2] PM: use dpm_run_callback in device_prepare

[shuox.liu@intel.com]

From: ShuoX Liu <shuox.liu@intel.com>

dpm_run_callback could show more debug info around prepare stage.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Liu ShuoX <shuox.liu@intel.com>
---
 drivers/base/power/main.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 5a9b656..cb89323 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1223,7 +1223,7 @@ int dpm_suspend(pm_message_t state)
  */
 static int device_prepare(struct device *dev, pm_message_t state)
 {
-	int (*callback)(struct device *) = NULL;
+	pm_callback_t callback = NULL;
 	char *info = NULL;
 	int error = 0;
 
@@ -1261,10 +1261,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
 		callback = dev->driver->pm->prepare;
 	}
 
-	if (callback) {
-		error = callback(dev);
-		suspend_report_result(callback, error);
-	}
+	error = dpm_run_callback(callback, dev, state, info);
 
 	device_unlock(dev);
 
@@ -1280,6 +1277,7 @@ static int device_prepare(struct device *dev, pm_message_t state)
 int dpm_prepare(pm_message_t state)
 {
 	int error = 0;
+	ktime_t starttime = ktime_get();
 
 	might_sleep();
 
@@ -1311,6 +1309,7 @@ int dpm_prepare(pm_message_t state)
 		put_device(dev);
 	}
 	mutex_unlock(&dpm_list_mtx);
+	dpm_show_time(starttime, state, "prepare");
 	return error;
 }
 
-- 
1.7.1