USB: switch ehci-hcd to new polling scheme
Switch ehci-hcd to use the new polling scheme, which reports root hub status changes via the interrupt handler, in an asynchronous fashion. Doing so disables polling for status changes (whose handler is rh_timer_func). Tested on a Geode GX machine, which is now capable of running at =~ 5 timer interrupts per second (in the -rt tree), resulting in significant power savings. Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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