power management: no valid states w/o pm_ops
Change /sys/power/state to not advertise any valid states (except for disk if SOFTWARE_SUSPEND is enabled) when no pm_ops have been set so userspace can easily discover what states should be available. Signed-off-by: NJohannes Berg <johannes@sipsolutions.net> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Macheck <pavel@ucw.cz> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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