diff options
Diffstat (limited to 'drivers/acpi/sleep.c')
| -rw-r--r-- | drivers/acpi/sleep.c | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index eaa47753b758..a60ff5dfed3a 100644 --- a/drivers/acpi/sleep.c +++ b/drivers/acpi/sleep.c @@ -73,7 +73,6 @@ static int acpi_sleep_prepare(u32 acpi_state) acpi_set_waking_vector(acpi_wakeup_address); } - ACPI_FLUSH_CPU_CACHE(); #endif pr_info("Preparing to enter system sleep state S%d\n", acpi_state); acpi_enable_wakeup_devices(acpi_state); @@ -566,8 +565,6 @@ static int acpi_suspend_enter(suspend_state_t pm_state) u32 acpi_state = acpi_target_sleep_state; int error; - ACPI_FLUSH_CPU_CACHE(); - trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); switch (acpi_state) { case ACPI_STATE_S1: @@ -877,11 +874,11 @@ static inline void acpi_sleep_syscore_init(void) {} #ifdef CONFIG_HIBERNATION static unsigned long s4_hardware_signature; static struct acpi_table_facs *facs; -static bool nosigcheck; +static int sigcheck = -1; /* Default behaviour is just to warn */ -void __init acpi_no_s4_hw_signature(void) +void __init acpi_check_s4_hw_signature(int check) { - nosigcheck = true; + sigcheck = check; } static int acpi_hibernation_begin(pm_message_t stage) @@ -903,8 +900,6 @@ static int acpi_hibernation_enter(void) { acpi_status status = AE_OK; - ACPI_FLUSH_CPU_CACHE(); - /* This shouldn't return. If it returns, we have a problem */ status = acpi_enter_sleep_state(ACPI_STATE_S4); /* Reprogram control registers */ @@ -1009,12 +1004,28 @@ static void acpi_sleep_hibernate_setup(void) hibernation_set_ops(old_suspend_ordering ? &acpi_hibernation_ops_old : &acpi_hibernation_ops); sleep_states[ACPI_STATE_S4] = 1; - if (nosigcheck) + if (!sigcheck) return; acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); - if (facs) + if (facs) { + /* + * s4_hardware_signature is the local variable which is just + * used to warn about mismatch after we're attempting to + * resume (in violation of the ACPI specification.) + */ s4_hardware_signature = facs->hardware_signature; + + if (sigcheck > 0) { + /* + * If we're actually obeying the ACPI specification + * then the signature is written out as part of the + * swsusp header, in order to allow the boot kernel + * to gracefully decline to resume. + */ + swsusp_hardware_signature = facs->hardware_signature; + } + } } #else /* !CONFIG_HIBERNATION */ static inline void acpi_sleep_hibernate_setup(void) {} |