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kernel/reboot: Wrap legacy power-off callbacks into sys-off handlers 

Wrap legacy power-off callbacks into sys-off handlers in order to
support co-existence of both legacy and new callbacks while we're
in process of upgrading legacy callbacks to the new API.

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 02:32:12 +03:00 committed by Rafael J. Wysocki
parent 232edc2f72
commit 7b9a3de9ff
1 changed files with 42 additions and 2 deletions
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44
kernel/reboot.c
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@ -463,6 +463,47 @@ int devm_register_sys_off_handler(struct device *dev,
} }
EXPORT_SYMBOL_GPL(devm_register_sys_off_handler); EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);
static int legacy_pm_power_off_prepare(struct sys_off_data *data)
{
if (pm_power_off_prepare)
pm_power_off_prepare();
return NOTIFY_DONE;
}
static int legacy_pm_power_off(struct sys_off_data *data)
{
if (pm_power_off)
pm_power_off();
return NOTIFY_DONE;
}
/*
* Register sys-off handlers for legacy PM callbacks. This allows legacy
* PM callbacks co-exist with the new sys-off API.
*
* TODO: Remove legacy handlers once all legacy PM users will be switched
* to the sys-off based APIs.
*/
static int __init legacy_pm_init(void)
{
register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
SYS_OFF_PRIO_DEFAULT,
legacy_pm_power_off_prepare, NULL);
register_sys_off_handler(SYS_OFF_MODE_POWER_OFF, SYS_OFF_PRIO_DEFAULT,
legacy_pm_power_off, NULL);
return 0;
}
core_initcall(legacy_pm_init);
static void do_kernel_power_off_prepare(void)
{
blocking_notifier_call_chain(&power_off_prep_handler_list, 0, NULL);
}
/** /**
* kernel_power_off - power_off the system * kernel_power_off - power_off the system
* *
@ -471,8 +512,7 @@ EXPORT_SYMBOL_GPL(devm_register_sys_off_handler);
void kernel_power_off(void) void kernel_power_off(void)
{ {
kernel_shutdown_prepare(SYSTEM_POWER_OFF); kernel_shutdown_prepare(SYSTEM_POWER_OFF);
if (pm_power_off_prepare) do_kernel_power_off_prepare();
pm_power_off_prepare();
migrate_to_reboot_cpu(); migrate_to_reboot_cpu();
syscore_shutdown(); syscore_shutdown();
pr_emerg("Power down\n"); pr_emerg("Power down\n");