1 files changed, 100 insertions, 3 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 02ec716a4927..f33769f97aca 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -795,6 +795,103 @@ int hibernate(void)
 	return error;
 }
 
+/**
+ * hibernate_quiet_exec - Execute a function with all devices frozen.
+ * @func: Function to execute.
+ * @data: Data pointer to pass to @func.
+ *
+ * Return the @func return value or an error code if it cannot be executed.
+ */
+int hibernate_quiet_exec(int (*func)(void *data), void *data)
+{
+	int error, nr_calls = 0;
+
+	lock_system_sleep();
+
+	if (!hibernate_acquire()) {
+		error = -EBUSY;
+		goto unlock;
+	}
+
+	pm_prepare_console();
+
+	error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
+	if (error) {
+		nr_calls--;
+		goto exit;
+	}
+
+	error = freeze_processes();
+	if (error)
+		goto exit;
+
+	lock_device_hotplug();
+
+	pm_suspend_clear_flags();
+
+	error = platform_begin(true);
+	if (error)
+		goto thaw;
+
+	error = freeze_kernel_threads();
+	if (error)
+		goto thaw;
+
+	error = dpm_prepare(PMSG_FREEZE);
+	if (error)
+		goto dpm_complete;
+
+	suspend_console();
+
+	error = dpm_suspend(PMSG_FREEZE);
+	if (error)
+		goto dpm_resume;
+
+	error = dpm_suspend_end(PMSG_FREEZE);
+	if (error)
+		goto dpm_resume;
+
+	error = platform_pre_snapshot(true);
+	if (error)
+		goto skip;
+
+	error = func(data);
+
+skip:
+	platform_finish(true);
+
+	dpm_resume_start(PMSG_THAW);
+
+dpm_resume:
+	dpm_resume(PMSG_THAW);
+
+	resume_console();
+
+dpm_complete:
+	dpm_complete(PMSG_THAW);
+
+	thaw_kernel_threads();
+
+thaw:
+	platform_end(true);
+
+	unlock_device_hotplug();
+
+	thaw_processes();
+
+exit:
+	__pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
+
+	pm_restore_console();
+
+	hibernate_release();
+
+unlock:
+	unlock_system_sleep();
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
 
 /**
  * software_resume - Resume from a saved hibernation image.
@@ -1062,7 +1159,7 @@ power_attr(disk);
 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
 			   char *buf)
 {
-	return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
+	return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
 		       MINOR(swsusp_resume_device));
 }
 
@@ -1162,7 +1259,7 @@ static ssize_t reserved_size_store(struct kobject *kobj,
 
 power_attr(reserved_size);
 
-static struct attribute * g[] = {
+static struct attribute *g[] = {
 	&disk_attr.attr,
 	&resume_offset_attr.attr,
 	&resume_attr.attr,
@@ -1190,7 +1287,7 @@ static int __init resume_setup(char *str)
 	if (noresume)
 		return 1;
 
-	strncpy( resume_file, str, 255 );
+	strncpy(resume_file, str, 255);
 	return 1;
 }