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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/disk.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/disk.c')
-rw-r--r--kernel/power/disk.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 885c653509c9..324ac0188ce1 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -281,9 +281,16 @@ int hibernate(void)
{
int error;
+ mutex_lock(&pm_mutex);
/* The snapshot device should not be opened while we're running */
- if (!atomic_add_unless(&snapshot_device_available, -1, 0))
- return -EBUSY;
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+ error = -EBUSY;
+ goto Unlock;
+ }
+
+ error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+ if (error)
+ goto Exit;
/* Allocate memory management structures */
error = create_basic_memory_bitmaps();
@@ -294,7 +301,6 @@ int hibernate(void)
if (error)
goto Finish;
- mutex_lock(&pm_mutex);
if (hibernation_mode == HIBERNATION_TESTPROC) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
@@ -316,12 +322,14 @@ int hibernate(void)
swsusp_free();
}
Thaw:
- mutex_unlock(&pm_mutex);
unprepare_processes();
Finish:
free_basic_memory_bitmaps();
Exit:
+ pm_notifier_call_chain(PM_POST_HIBERNATION);
atomic_inc(&snapshot_device_available);
+ Unlock:
+ mutex_unlock(&pm_mutex);
return error;
}