[PATCH] Driver Core: remove driver model detach_state

The driver model has a "detach_state" mechanism that:

 - Has never been used by any in-kernel drive;
 - Is superfluous, since driver remove() methods can do the same thing;
 - Became buggy when the suspend() parameter changed semantics and type;
 - Could self-deadlock when called from certain suspend contexts;
 - Is effectively wasted documentation, object code, and headspace.

This removes that "detach_state" mechanism; net code shrink, as well
as a per-device saving in the driver model and sysfs.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 0 insertions, 27 deletions

diff --git a/drivers/base/power/power.h b/drivers/base/power/power.h
index e5eda74..2e700d7 100644
--- a/drivers/base/power/power.h
+++ b/drivers/base/power/power.h
@@ -1,18 +1,7 @@
-
-
-enum {
-	DEVICE_PM_ON,
-	DEVICE_PM1,
-	DEVICE_PM2,
-	DEVICE_PM3,
-	DEVICE_PM_OFF,
-};
-
 /*
  * shutdown.c
  */
 
-extern int device_detach_shutdown(struct device *);
 extern void device_shutdown(void);
 
 
diff --git a/drivers/base/power/shutdown.c b/drivers/base/power/shutdown.c
index 9797990..f50a08b 100644
--- a/drivers/base/power/shutdown.c
+++ b/drivers/base/power/shutdown.c
@@ -19,22 +19,6 @@
 extern struct subsystem devices_subsys;
 
 
-int device_detach_shutdown(struct device * dev)
-{
-	if (!dev->detach_state)
-		return 0;
-
-	if (dev->detach_state == DEVICE_PM_OFF) {
-		if (dev->driver && dev->driver->shutdown) {
-			dev_dbg(dev, "shutdown\n");
-			dev->driver->shutdown(dev);
-		}
-		return 0;
-	}
-	return dpm_runtime_suspend(dev, dev->detach_state);
-}
-
-
 /**
  * We handle system devices differently - we suspend and shut them
  * down last and resume them first. That way, we don't do anything stupid like