ACPI / sleep: pm_power_off needs more sanity checks to be installed
Sleep control and status registers need santity checks as well before ACPI installs acpi_power_off to pm_power_off hook. The checking code in acpi_enter_sleep_state() is too late, we should not allow a not-working pm_power_off function to be hooked up. Signed-off-by: NAubrey Li <aubrey.li@intel.com> Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
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