commit c3e94d899c864e558f938f9845ddb8c2e5d5ccd0
author Alan Stern <stern@rowland.harvard.edu> Mon Nov 19 23:38:25 2007 +0100
committer Len Brown <len.brown@intel.com> Fri Feb 01 18:30:53 2008 -0500
tree cdc2d5007e2d8053ab1903f9e66c46dca9a9de81
parent 2f8ed1c60b06b797bf79a1dc540f0bed8c9d75a0

Hibernation: Add PM_RESTORE_PREPARE and PM_POST_RESTORE notifiers (rev. 2)

Add PM_RESTORE_PREPARE and PM_POST_RESTORE notifiers to the PM core, to be used
in analogy with the existing PM_HIBERNATION_PREPARE and PM_POST_HIBERNATION
notifiers.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

kernel/power/user.c

diff --git a/kernel/power/user.c b/kernel/power/user.c
index b902a7e..f5512cb 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -67,6 +67,7 @@
 static int snapshot_open(struct inode *inode, struct file *filp)
 {
 	struct snapshot_data *data;
+	int error;
 
 	if (!atomic_add_unless(&snapshot_device_available, -1, 0))
 		return -EBUSY;
@@ -87,9 +88,19 @@
 		data->swap = swsusp_resume_device ?
 			swap_type_of(swsusp_resume_device, 0, NULL) : -1;
 		data->mode = O_RDONLY;
+		error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+		if (error)
+			pm_notifier_call_chain(PM_POST_RESTORE);
 	} else {
 		data->swap = -1;
 		data->mode = O_WRONLY;
+		error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
+		if (error)
+			pm_notifier_call_chain(PM_POST_HIBERNATION);
+	}
+	if (error) {
+		atomic_inc(&snapshot_device_available);
+		return error;
 	}
 	data->frozen = 0;
 	data->ready = 0;
@@ -111,6 +122,8 @@
 		thaw_processes();
 		mutex_unlock(&pm_mutex);
 	}
+	pm_notifier_call_chain(data->mode == O_WRONLY ?
+			PM_POST_HIBERNATION : PM_POST_RESTORE);
 	atomic_inc(&snapshot_device_available);
 	return 0;
 }
@@ -174,18 +187,13 @@
 		if (data->frozen)
 			break;
 		mutex_lock(&pm_mutex);
-		error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
-		if (!error) {
-			printk("Syncing filesystems ... ");
-			sys_sync();
-			printk("done.\n");
+		printk("Syncing filesystems ... ");
+		sys_sync();
+		printk("done.\n");
 
-			error = freeze_processes();
-			if (error)
-				thaw_processes();
-		}
+		error = freeze_processes();
 		if (error)
-			pm_notifier_call_chain(PM_POST_HIBERNATION);
+			thaw_processes();
 		mutex_unlock(&pm_mutex);
 		if (!error)
 			data->frozen = 1;
@@ -196,7 +204,6 @@
 			break;
 		mutex_lock(&pm_mutex);
 		thaw_processes();
-		pm_notifier_call_chain(PM_POST_HIBERNATION);
 		mutex_unlock(&pm_mutex);
 		data->frozen = 0;
 		break;