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To prepare for a subsequent change and make the code somewhat easier
to follow, do the following in the ACPI device wakeup handling code:
* Replace wakeup.flags.enabled under struct acpi_device with
wakeup.enable_count as that will be necessary going forward.
For now, wakeup.enable_count is not allowed to grow beyond 1,
so the current behavior is retained.
* Split acpi_device_wakeup() into acpi_device_wakeup_enable()
and acpi_device_wakeup_disable() and modify the callers of
it accordingly.
* Introduce a new acpi_wakeup_lock mutex to protect the wakeup
enabling/disabling code from races in case it is executed
more than once in parallel for the same device (which may
happen for bridges theoretically).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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