[driver model] Make sure that system devices are handled specially power-wise

- Suspend system devices last, after interrupts have been enabled. 
- Resume them first, before interrupts are enabled. 
- Shut them down last, after everything else.

drivers/base/power.c

@@ -21,6 +21,19 @@
 
 extern struct subsystem devices_subsys;
 
+/**
+ * We handle system devices differently - we suspend and shut them 
+ * down first and resume them first. That way, we do anything stupid like
+ * shutting down the interrupt controller before any devices..
+ *
+ * Note that there are not different stages for power management calls - 
+ * they only get one called once when interrupts are disabled. 
+ */
+
+extern int sys_device_shutdown(void);
+extern int sys_device_suspend(u32 state);
+extern int sys_device_resume(void);
+
 /**
  * device_suspend - suspend/remove all devices on the device ree
  * @state:	state we're entering
@@ -50,6 +63,10 @@ int device_suspend(u32 state, u32 level)
 		}
 	}
 	up_write(&devices_subsys.rwsem);
+
+	if (level == SUSPEND_POWER_DOWN)
+		sys_device_suspend(state);
+
 	return error;
 }
 
@@ -65,6 +82,9 @@ void device_resume(u32 level)
 {
 	struct list_head * node;
 
+	if (level == RESUME_POWER_ON)
+		sys_device_resume();
+
 	down_write(&devices_subsys.rwsem);
 	list_for_each_prev(node,&devices_subsys.kset.list) {
 		struct device * dev = to_dev(node);
@@ -98,6 +118,8 @@ void device_shutdown(void)
 			pr_debug("Ignored.\n");
 	}
 	up_write(&devices_subsys.rwsem);
+
+	sys_device_shutdown();
 }
 
 EXPORT_SYMBOL(device_suspend);