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kernel/reboot: Add do_kernel_power_off()

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Add do_kernel_power_off() helper that will remove open-coded pm_power_off
invocations from the architecture code. This is the first step on the way
to remove the global pm_power_off variable, which will allow us to
implement consistent power-off chaining support.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dmitry Osipenko 2022-05-10 02:32:13 +03:00 committed by Rafael J. Wysocki
parent 7b9a3de9ff
commit 2b6aa7332f
2 changed files with 15 additions and 0 deletions
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2
include/linux/reboot.h
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@ -63,6 +63,8 @@ extern void machine_shutdown(void);
struct pt_regs;
extern void machine_crash_shutdown(struct pt_regs *);
void do_kernel_power_off(void);
/*
* sys-off handler API.
*/

13
kernel/reboot.c
View File

@ -504,6 +504,19 @@ static void do_kernel_power_off_prepare(void)
blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
}
/**
* do_kernel_power_off - Execute kernel power-off handler call chain
*
* Expected to be called as last step of the power-off sequence.
*
* Powers off the system immediately if a power-off handler function has
* been registered. Otherwise does nothing.
*/
void do_kernel_power_off(void)
{
atomic_notifier_call_chain(&power_off_handler_list, 0, NULL);
}
/**
* kernel_power_off - power_off the system
*