1 files changed, 29 insertions, 31 deletions

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 4360e0816956..1d7d4c5797ee 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -38,18 +38,16 @@ typedef int __bitwise suspend_state_t;
  *      There is the %suspend_valid_only_mem function available that can be
  *      assigned to this if the platform only supports mem sleep.
  *
- * @set_target: Tell the platform which system sleep state is going to be
- *      entered.
- *      @set_target() is executed right prior to suspending devices.  The
- *      information conveyed to the platform code by @set_target() should be
- *      disregarded by the platform as soon as @finish() is executed and if
- *      @prepare() fails.  If @set_target() fails (ie. returns nonzero),
+ * @begin: Initialise a transition to given system sleep state.
+ *      @begin() is executed right prior to suspending devices.  The information
+ *      conveyed to the platform code by @begin() should be disregarded by it as
+ *      soon as @end() is executed.  If @begin() fails (ie. returns nonzero),
  *      @prepare(), @enter() and @finish() will not be called by the PM core.
  *      This callback is optional.  However, if it is implemented, the argument
- *      passed to @enter() is meaningless and should be ignored.
+ *      passed to @enter() is redundant and should be ignored.
  *
  * @prepare: Prepare the platform for entering the system sleep state indicated
- *      by @set_target().
+ *      by @begin().
  *      @prepare() is called right after devices have been suspended (ie. the
  *      appropriate .suspend() method has been executed for each device) and
  *      before the nonboot CPUs are disabled (it is executed with IRQs enabled).
@@ -57,8 +55,8 @@ typedef int __bitwise suspend_state_t;
  *      error code otherwise, in which case the system cannot enter the desired
  *      sleep state (@enter() and @finish() will not be called in that case).
  *
- * @enter: Enter the system sleep state indicated by @set_target() or
- *      represented by the argument if @set_target() is not implemented.
+ * @enter: Enter the system sleep state indicated by @begin() or represented by
+ *      the argument if @begin() is not implemented.
  *      This callback is mandatory.  It returns 0 on success or a negative
  *      error code otherwise, in which case the system cannot enter the desired
  *      sleep state.
@@ -69,13 +67,22 @@ typedef int __bitwise suspend_state_t;
  *      This callback is optional, but should be implemented by the platforms
  *      that implement @prepare().  If implemented, it is always called after
  *      @enter() (even if @enter() fails).
+ *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *      the platform that the system has returned to the working state or
+ *      the transition to the sleep state has been aborted.
+ *      This callback is optional, but should be implemented by the platforms
+ *      that implement @begin(), but platforms implementing @begin() should
+ *      also provide a @end() which cleans up transitions aborted before
+ *      @enter().
  */
 struct platform_suspend_ops {
         int (*valid)(suspend_state_t state);
-        int (*set_target)(suspend_state_t state);
+        int (*begin)(suspend_state_t state);
         int (*prepare)(void);
         int (*enter)(suspend_state_t state);
         void (*finish)(void);
+        void (*end)(void);
 };
 
 #ifdef CONFIG_SUSPEND
@@ -123,20 +130,22 @@ struct pbe {
 };
 
 /* mm/page_alloc.c */
-extern void drain_local_pages(void);
 extern void mark_free_pages(struct zone *zone);
 
 /**
  * struct platform_hibernation_ops - hibernation platform support
  *
- * The methods in this structure allow a platform to override the default
- * mechanism of shutting down the machine during a hibernation transition.
+ * The methods in this structure allow a platform to carry out special
+ * operations required by it during a hibernation transition.
  *
- * All three methods must be assigned.
+ * All the methods below must be implemented.
  *
- * @start: Tell the platform driver that we're starting hibernation.
+ * @begin: Tell the platform driver that we're starting hibernation.
  *      Called right after shrinking memory and before freezing devices.
  *
+ * @end: Called by the PM core right after resuming devices, to indicate to
+ *      the platform that the system has returned to the working state.
+ *
  * @pre_snapshot: Prepare the platform for creating the hibernation image.
  *      Called right after devices have been frozen and before the nonboot
  *      CPUs are disabled (runs with IRQs on).
@@ -171,7 +180,8 @@ extern void mark_free_pages(struct zone *zone);
  *      thawing devices (runs with IRQs on).
  */
 struct platform_hibernation_ops {
-        int (*start)(void);
+        int (*begin)(void);
+        void (*end)(void);
         int (*pre_snapshot)(void);
         void (*finish)(void);
         int (*prepare)(void);
@@ -211,22 +221,10 @@ static inline int hibernate(void) { return -ENOSYS; }
 #ifdef CONFIG_PM_SLEEP
 void save_processor_state(void);
 void restore_processor_state(void);
-struct saved_context;
-void __save_processor_state(struct saved_context *ctxt);
-void __restore_processor_state(struct saved_context *ctxt);
 
 /* kernel/power/main.c */
-extern struct blocking_notifier_head pm_chain_head;
-
-static inline int register_pm_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_register(&pm_chain_head, nb);
-}
-
-static inline int unregister_pm_notifier(struct notifier_block *nb)
-{
-        return blocking_notifier_chain_unregister(&pm_chain_head, nb);
-}
+extern int register_pm_notifier(struct notifier_block *nb);
+extern int unregister_pm_notifier(struct notifier_block *nb);
 
 #define pm_notifier(fn, pri) {                          \
         static struct notifier_block fn##_nb =                  \