Commit fbaad243 authored by David Woodhouse's avatar David Woodhouse Committed by Will Deacon
Browse files

arm64: acpi: Honour firmware_signature field of FACS, if it exists 



If the firmware_signature changes then OSPM should not attempt to resume
from hibernate, but should instead perform a clean reboot. Set the global
swsusp_hardware_signature to allow the generic code to include the value
in the swsusp header on disk, and perform the appropriate check on resume.

Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Acked-by: default avatarSudeep Holla <sudeep.holla@arm.com>
Acked-by: default avatarRafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20240412073530.2222496-3-dwmw2@infradead.org


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent bc5b492a

arch/arm64/kernel/acpi.c

+10 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/libfdt.h>

#include <linux/smp.h>

#include <linux/serial_core.h>

#include <linux/suspend.h>

#include <linux/pgtable.h>



#include <acpi/ghes.h>
@@ -227,6 +228,15 @@ void __init acpi_boot_table_init(void) 
		if (earlycon_acpi_spcr_enable)

			early_init_dt_scan_chosen_stdout();

	} else {

#ifdef CONFIG_HIBERNATION

		struct acpi_table_header *facs = NULL;

		acpi_get_table(ACPI_SIG_FACS, 1, &facs);

		if (facs) {

			swsusp_hardware_signature =

				((struct acpi_table_facs *)facs)->hardware_signature;

			acpi_put_table(facs);

		}

#endif

		acpi_parse_spcr(earlycon_acpi_spcr_enable, true);

		if (IS_ENABLED(CONFIG_ACPI_BGRT))

			acpi_table_parse(ACPI_SIG_BGRT, acpi_parse_bgrt);