1 files changed, 9 insertions, 0 deletions

diff --git a/kernel/sys.c b/kernel/sys.c
index 18987c7f6add..d40e40a9446c 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -100,6 +100,13 @@ struct pid *cad_pid;
 EXPORT_SYMBOL(cad_pid);
 
 /*
+ * If set, this is used for preparing the system to power off.
+ */
+
+void (*pm_power_off_prepare)(void);
+EXPORT_SYMBOL(pm_power_off_prepare);
+
+/*
  *      Notifier list for kernel code which wants to be called
  *      at shutdown. This is used to stop any idling DMA operations
  *      and the like. 
@@ -867,6 +874,8 @@ EXPORT_SYMBOL_GPL(kernel_halt);
 void kernel_power_off(void)
 {
         kernel_shutdown_prepare(SYSTEM_POWER_OFF);
+        if (pm_power_off_prepare)
+                pm_power_off_prepare();
         printk(KERN_EMERG "Power down.\n");
         machine_power_off();
 }