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authorRafael J. Wysocki <rjw@sisk.pl>2007-10-18 03:04:42 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-18 14:37:18 -0700
commit74f270af0c1ed5b9d4413784256959dcfe3593ce (patch)
tree5b74248167be086b0050a84f9ebe072bbb43fdb3 /kernel/power
parentf242d9196fd1ef4e6bf0e50d2e7f32866fb145c2 (diff)
downloadop-kernel-dev-74f270af0c1ed5b9d4413784256959dcfe3593ce.zip
op-kernel-dev-74f270af0c1ed5b9d4413784256959dcfe3593ce.tar.gz
PM: Rework struct hibernation_ops
During hibernation we also need to tell the ACPI core that we're going to put the system into the S4 sleep state. For this reason, an additional method in 'struct hibernation_ops' is needed, playing the role of set_target() in 'struct platform_suspend_operations'. Moreover, the role of the .prepare() method is now different, so it's better to introduce another method, that in general may be different from .prepare(), that will be used to prepare the platform for creating the hibernation image (.prepare() is used anyway to notify the platform that we're going to enter the low power state after the image has been saved). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c27
1 files changed, 21 insertions, 6 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index eb72255..d17bb14 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -54,8 +54,9 @@ static struct hibernation_ops *hibernation_ops;
void hibernation_set_ops(struct hibernation_ops *ops)
{
- if (ops && !(ops->prepare && ops->enter && ops->finish
- && ops->pre_restore && ops->restore_cleanup)) {
+ if (ops && !(ops->start && ops->pre_snapshot && ops->finish
+ && ops->prepare && ops->enter && ops->pre_restore
+ && ops->restore_cleanup)) {
WARN_ON(1);
return;
}
@@ -69,16 +70,26 @@ void hibernation_set_ops(struct hibernation_ops *ops)
mutex_unlock(&pm_mutex);
}
+/**
+ * platform_start - tell the platform driver that we're starting
+ * hibernation
+ */
+
+static int platform_start(int platform_mode)
+{
+ return (platform_mode && hibernation_ops) ?
+ hibernation_ops->start() : 0;
+}
/**
- * platform_prepare - prepare the machine for hibernation using the
+ * platform_pre_snapshot - prepare the machine for hibernation using the
* platform driver if so configured and return an error code if it fails
*/
-static int platform_prepare(int platform_mode)
+static int platform_pre_snapshot(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
- hibernation_ops->prepare() : 0;
+ hibernation_ops->pre_snapshot() : 0;
}
/**
@@ -135,12 +146,16 @@ int hibernation_snapshot(int platform_mode)
if (error)
return error;
+ error = platform_start(platform_mode);
+ if (error)
+ return error;
+
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Resume_console;
- error = platform_prepare(platform_mode);
+ error = platform_pre_snapshot(platform_mode);
if (error)
goto Resume_devices;
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