[power] Fix device suspend handling

- Handle -EAGAIN in device_suspend() properly: keep going, with error reset
  to 0. 

- Call dpm_resume() if we got a real error, instead of device_resume(), which
  would deadlock.

drivers/base/power/power.h

@@ -58,7 +58,8 @@ extern void dpm_sysfs_remove(struct device *);
 /*
  * resume.c 
  */
-extern int dpm_resume(void);
+
+extern void dpm_resume(void);
 extern void dpm_power_up(void);
 extern int resume_device(struct device *);
 

drivers/base/power/resume.c

@@ -28,6 +28,19 @@ int resume_device(struct device * dev)
 }
 
 
+
+void dpm_resume(void)
+{
+	while(!list_empty(&dpm_off)) {
+		struct list_head * entry = dpm_off.next;
+		struct device * dev = to_device(entry);
+		list_del_init(entry);
+		resume_device(dev);
+		list_add_tail(entry,&dpm_active);
+	}
+}
+
+
 /**
  *	device_resume - Restore state of each device in system.
  *
@@ -38,13 +51,7 @@ int resume_device(struct device * dev)
 void device_resume(void)
 {
 	down(&dpm_sem);
-	while(!list_empty(&dpm_off)) {
-		struct list_head * entry = dpm_off.next;
-		struct device * dev = to_device(entry);
-		list_del_init(entry);
-		resume_device(dev);
-		list_add_tail(entry,&dpm_active);
-	}
+	dpm_resume();
 	up(&dpm_sem);
 }
 

drivers/base/power/suspend.c

@@ -81,14 +81,18 @@ int device_suspend(u32 state)
 	while(!list_empty(&dpm_active)) {
 		struct list_head * entry = dpm_active.prev;
 		struct device * dev = to_device(entry);
-		if ((error = suspend_device(dev,state)))
+		if ((error = suspend_device(dev,state))) {
+			if (error != -EAGAIN)
 				goto Error;
+			else
+				error = 0;
+		}
 	}
  Done:
 	up(&dpm_sem);
 	return error;
  Error:
-	device_resume();
+	dpm_resume();
 	goto Done;
 }