[ACPI] fix reboot upon suspend-to-disk

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

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 027322a..f2cd279 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -52,7 +52,7 @@
 
 	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:
@@ -119,13 +119,6 @@
 		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. */
 	free_some_memory();
 	return 0;