RFC: additional event for pm_notifier

[Sebastian Ott <sebott@linux.vnet.ibm.com>]

hi,

on s390 certain hw features which we normally enable in our init
calls, get reset while restoring the hibernation image.
so we need a trigger to reenable them before the device callbacks
are called.

is it possible to add an additional event for the existing
pm_notifier (something like the attached patch)?

regards
sebastian


Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
---
 include/linux/notifier.h |    1 +
 kernel/power/hibernate.c |    2 ++
 2 files changed, 3 insertions(+)

Index: linux-2.6/include/linux/notifier.h
===================================================================
--- linux-2.6.orig/include/linux/notifier.h
+++ linux-2.6/include/linux/notifier.h
@@ -250,6 +250,8 @@ static inline int notifier_to_errno(int 
 #define PM_POST_SUSPEND		0x0004 /* Suspend finished */
 #define PM_RESTORE_PREPARE	0x0005 /* Going to restore a saved image */
 #define PM_POST_RESTORE		0x0006 /* Restore failed */
+#define PM_RESTORE_FINISHED	0x0007 /* Image restored, called prior to
+					  device callbacks */
 
 /* Console keyboard events.
  * Note: KBD_KEYCODE is always sent before KBD_UNBOUND_KEYCODE, KBD_UNICODE and
Index: linux-2.6/kernel/power/hibernate.c
===================================================================
--- linux-2.6.orig/kernel/power/hibernate.c
+++ linux-2.6/kernel/power/hibernate.c
@@ -290,6 +290,8 @@ static int create_image(int platform_mod
 	if (!in_suspend)
 		platform_leave(platform_mode);
 
+	pm_notifier_call_chain(PM_RESTORE_FINISHED);
+
  Power_up:
 	sysdev_resume();
 	/* NOTE:  dpm_resume_noirq() is just a resume() for devices