[ACPI] fix reboot upon suspend-to-disk

http://bugzilla.kernel.org/show_bug.cgi?id=4320

Signed-off-by: Alexey Starikovskiy <[e-mail]>
Acked-by: Pavel Machek <[e-mail]>
Signed-off-by: Len Brown <[e-mail]>

drivers/acpi/sleep/poweroff.c

···
 	ACPI_FLUSH_CPU_CACHE();
 	acpi_enable_wakeup_device_prep(acpi_state);
 #endif
-	if (acpi_state == ACPI_STATE_S5) {
-		acpi_wakeup_gpe_poweroff_prepare();
-	}
+	acpi_gpe_sleep_prepare(acpi_state);
 	acpi_enter_sleep_state_prep(acpi_state);
 	return 0;
 }
···
 
 static int acpi_shutdown(struct sys_device *x)
 {
-	if (system_state == SYSTEM_POWER_OFF) {
-		/* Prepare if we are going to power off the system */
+	switch (system_state) {
+	case SYSTEM_POWER_OFF:
+		/* Prepare to power off the system */
 		return acpi_sleep_prepare(ACPI_STATE_S5);
+	case SYSTEM_SUSPEND_DISK:
+		/* Prepare to suspend the system to disk */
+		return acpi_sleep_prepare(ACPI_STATE_S4);
+	default:
+		return 0;
 	}
-	return 0;
 }
 
 static struct sysdev_class acpi_sysclass = {

drivers/acpi/sleep/sleep.h

···
 extern void acpi_enable_wakeup_device_prep(u8 sleep_state);
 extern void acpi_enable_wakeup_device(u8 sleep_state);
 extern void acpi_disable_wakeup_device(u8 sleep_state);
-extern void acpi_wakeup_gpe_poweroff_prepare(void);
+extern void acpi_gpe_sleep_prepare(u32 sleep_state);

drivers/acpi/sleep/wakeup.c

···
  * RUNTIME GPEs, we simply mark all GPES that
  * are not enabled for wakeup from S5 as RUNTIME.
  */
-void acpi_wakeup_gpe_poweroff_prepare(void)
+void acpi_gpe_sleep_prepare(u32 sleep_state)
 {
 	struct list_head *node, *next;
 
···
 						       struct acpi_device,
 						       wakeup_list);
 
-		/* The GPE can wakeup system from S5, don't touch it */
-		if ((u32) dev->wakeup.sleep_state == ACPI_STATE_S5)
+		/* The GPE can wakeup system from this state, don't touch it */
+		if ((u32) dev->wakeup.sleep_state >= sleep_state)
 			continue;
 		/* acpi_set_gpe_type will automatically disable GPE */
 		acpi_set_gpe_type(dev->wakeup.gpe_device,

include/linux/kernel.h

···
 	SYSTEM_HALT,
 	SYSTEM_POWER_OFF,
 	SYSTEM_RESTART,
+	SYSTEM_SUSPEND_DISK,
 } system_state;
 
 #define TAINT_PROPRIETARY_MODULE	(1<<0)

include/linux/reboot.h

···
  */
 
 extern void kernel_restart_prepare(char *cmd);
-extern void kernel_halt_prepare(void);
-extern void kernel_power_off_prepare(void);
+extern void kernel_shutdown_prepare(enum system_states state);
 
 extern void kernel_restart(char *cmd);
 extern void kernel_halt(void);

kernel/power/disk.c

···
 
 	switch(mode) {
 	case PM_DISK_PLATFORM:
-		kernel_power_off_prepare();
+		kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
 		error = pm_ops->enter(PM_SUSPEND_DISK);
 		break;
 	case PM_DISK_SHUTDOWN:
···
 	if (freeze_processes()) {
 		error = -EBUSY;
 		goto thaw;
-	}
-
-	if (pm_disk_mode == PM_DISK_PLATFORM) {
-		if (pm_ops && pm_ops->prepare) {
-			if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
-				goto thaw;
-		}
 	}
 
 	/* Free memory before shutting down devices. */

kernel/sys.c

···
 }
 EXPORT_SYMBOL_GPL(kernel_kexec);
 
+void kernel_shutdown_prepare(enum system_states state)
+{
+	notifier_call_chain(&reboot_notifier_list,
+		(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
+	system_state = state;
+	device_shutdown();
+}
 /**
  *	kernel_halt - halt the system
  *
  *	Shutdown everything and perform a clean system halt.
  */
-void kernel_halt_prepare(void)
-{
-	notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
-	system_state = SYSTEM_HALT;
-	device_shutdown();
-}
 void kernel_halt(void)
 {
-	kernel_halt_prepare();
+	kernel_shutdown_prepare(SYSTEM_HALT);
 	printk(KERN_EMERG "System halted.\n");
 	machine_halt();
 }
+
 EXPORT_SYMBOL_GPL(kernel_halt);
 
 /**
···
  *
  *	Shutdown everything and perform a clean system power_off.
  */
-void kernel_power_off_prepare(void)
-{
-	notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
-	system_state = SYSTEM_POWER_OFF;
-	device_shutdown();
-}
 void kernel_power_off(void)
 {
-	kernel_power_off_prepare();
+	kernel_shutdown_prepare(SYSTEM_POWER_OFF);
 	printk(KERN_EMERG "Power down.\n");
 	machine_power_off();
 }
 EXPORT_SYMBOL_GPL(kernel_power_off);
-
 /*
  * Reboot system call: for obvious reasons only root may call it,
  * and even root needs to set up some magic numbers in the registers