Sleep control and status registers need santity check before ACPI
install acpi_power_off to pm_power_off hook. The checking code in
acpi_enter_sleep_state() is too late, we should not allow a not-working
pm_power_off function hooked.
Signed-off-by: Aubrey Li <aubrey.li@xxxxxxxxx>
---
drivers/acpi/sleep.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index b718806..0284d22 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -809,8 +809,11 @@ int __init acpi_sleep_init(void)
status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
if (ACPI_SUCCESS(status)) {
sleep_states[ACPI_STATE_S5] = 1;
- pm_power_off_prepare = acpi_power_off_prepare;
- pm_power_off = acpi_power_off;
+ if (acpi_gbl_FADT.sleep_control.address &&
+ acpi_gbl_FADT.sleep_status.address) {
+ pm_power_off_prepare = acpi_power_off_prepare;
+ pm_power_off = acpi_power_off;
+ }
}
supported[0] = 0;
--
1.7.10.4
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