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authorRafael J. Wysocki <rjw@sisk.pl>2007-07-19 01:47:36 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:42 -0700
commitb10d911749d37dccfa5873d2088aea3f074b9e45 (patch)
tree56bd0ccb2861d7ae562d4e48a737727628358b42 /kernel/power/main.c
parentc2cf7d87d804c66e063829d5ca739053e901dc15 (diff)
PM: introduce hibernation and suspend notifiers
Make it possible to register hibernation and suspend notifiers, so that subsystems can perform hibernation-related or suspend-related operations that should not be carried out by device drivers' .suspend() and .resume() routines. [akpm@linux-foundation.org: build fixes] [akpm@linux-foundation.org: cleanups] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Nigel Cunningham <nigel@nigel.suspend2.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power/main.c')
-rw-r--r--kernel/power/main.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c
index fc45ed22620f..4d26ad394fb3 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -23,6 +23,8 @@
#include "power.h"
+BLOCKING_NOTIFIER_HEAD(pm_chain_head);
+
/*This is just an arbitrary number */
#define FREE_PAGE_NUMBER (100)
@@ -78,6 +80,10 @@ static int suspend_prepare(suspend_state_t state)
if (!pm_ops || !pm_ops->enter)
return -EPERM;
+ error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
+ if (error)
+ goto Finish;
+
pm_prepare_console();
if (freeze_processes()) {
@@ -125,6 +131,8 @@ static int suspend_prepare(suspend_state_t state)
Thaw:
thaw_processes();
pm_restore_console();
+ Finish:
+ pm_notifier_call_chain(PM_POST_SUSPEND);
return error;
}
@@ -176,6 +184,7 @@ static void suspend_finish(suspend_state_t state)
resume_console();
thaw_processes();
pm_restore_console();
+ pm_notifier_call_chain(PM_POST_SUSPEND);
}