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efi: Fix efi_power_off() not being run before acpi_power_off() when necessary

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Commit 98f30d0ecf ("ACPI: power: Switch to sys-off handler API")
switched the ACPI sleep code from directly setting the old global
pm_power_off handler to using the new register_sys_off_handler()
mechanism with a priority of SYS_OFF_PRIO_FIRMWARE.

This is a problem when the old global pm_power_off handler would later
be overwritten, such as done by the late_initcall(efi_shutdown_init):

	if (efi_poweroff_required())
		pm_power_off = efi_power_off;

The old global pm_power_off handler gets run with a priority of
SYS_OFF_PRIO_DEFAULT which is lower then SYS_OFF_PRIO_FIRMWARE, causing
acpi_power_off() to run first, changing the behavior from before
the ACPI sleep code switched to the new register_sys_off_handler().

Switch the registering of efi_power_off over to register_sys_off_handler()
with a priority of SYS_OFF_PRIO_FIRMWARE + 1 so that it will run before
acpi_power_off() as before.

Note since the new sys-off-handler code will try all handlers in
priority order, there is no more need for the EFI code to store and
call the original pm_power_off handler.

Fixes: 98f30d0ecf ("ACPI: power: Switch to sys-off handler API")
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220708131412.81078-3-hdegoede@redhat.com
This commit is contained in:
Hans de Goede 2022-07-08 15:14:12 +02:00
parent 4ce8f4c202
commit d40908f262
1 changed files with 11 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/firmware/efi/reboot.c
View File

@ -6,7 +6,7 @@
#include <linux/efi.h>
#include <linux/reboot.h>
static void (*orig_pm_power_off)(void);
static struct sys_off_handler *efi_sys_off_handler;
int efi_reboot_quirk_mode = -1;
@ -51,15 +51,11 @@ bool __weak efi_poweroff_required(void)
return false;
}
static void efi_power_off(void)
static int efi_power_off(struct sys_off_data *data)
{
efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
/*
* The above call should not return, if it does fall back to
* the original power off method (typically ACPI poweroff).
*/
if (orig_pm_power_off)
orig_pm_power_off();
return NOTIFY_DONE;
}
static int __init efi_shutdown_init(void)
@ -68,8 +64,13 @@ static int __init efi_shutdown_init(void)
return -ENODEV;
if (efi_poweroff_required()) {
orig_pm_power_off = pm_power_off;
pm_power_off = efi_power_off;
/* SYS_OFF_PRIO_FIRMWARE + 1 so that it runs before acpi_power_off */
efi_sys_off_handler =
register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
SYS_OFF_PRIO_FIRMWARE + 1,
efi_power_off, NULL);
if (IS_ERR(efi_sys_off_handler))
return PTR_ERR(efi_sys_off_handler);
}
return 0;