USB: separate root and non-root suspend/resume

This patch (as916) completes the separation of code paths for suspend
and resume of root hubs as opposed to non-root devices.  Root hubs
will be power-managed through their bus_suspend and bus_resume
methods, whereas normal devices will use usb_port_suspend() and
usb_port_resume().

Changes to the hcd_bus_{suspend,resume} routines mostly represent
motion of code that was already present elsewhere.  They include:

	Adding debugging log messages,

	Setting the device state appropriately, and

	Adding a resume recovery time delay.

Changes to the port-suspend and port-resume routines in hub.c include:

	Removal of checks for root devices (since they will never
	be triggered), and

	Removal of checks for NULL or invalid device pointers (these
	were left over from earlier kernel versions and aren't needed
	at all).

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index ef50fa4..b5ebb73 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -364,23 +364,13 @@
 #ifdef CONFIG_PM
 extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd);
 extern void usb_root_hub_lost_power (struct usb_device *rhdev);
-extern int hcd_bus_suspend (struct usb_bus *bus);
-extern int hcd_bus_resume (struct usb_bus *bus);
+extern int hcd_bus_suspend(struct usb_device *rhdev);
+extern int hcd_bus_resume(struct usb_device *rhdev);
 #else
 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
 {
 	return;
 }
-
-static inline int hcd_bus_suspend(struct usb_bus *bus)
-{
-	return 0;
-}
-
-static inline int hcd_bus_resume (struct usb_bus *bus)
-{
-	return 0;
-}
 #endif /* CONFIG_PM */
 
 /*