Makes usbcore handle some suspend scenarios more consistently, especially
when talking with root hubs.

 - Use usb_device->state, not device->power.power_state.  (The driver model
   power_state is still needed for interfaces.)  With USB_SUSPEND=n, there
   are also cases where the HCD_STATE_SUSPENDED needs to be used instead
   of testing for USB_STATE_SUSPENDED.

 - Updates usb_device->state for root hubs during suspend/resume.

 - Fixes a locking bug (extra "up") that got merged recently, affecting
   CONFIG_USB_SUSPEND.

 - Recover one of the "HC died" cases better.

 - Root hub timer updates, handling various suspend transitions more
   consistently:  don't duplicate earlier submit checks, only work
   when hub is configured, address various submit/resume races.

Together, these help hubs work better regardless of whether USB_SUSPEND
has been enabled (that's the only way USB_STATE_SUSPENDED appears), and
whether or not the HCD is marked as suspended (or maybe Alan would
want to call that "half suspended").
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>