X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=kernel%2Fpower%2Fpm.c;h=84063ac8fcfc95bd15d56dc6778ec45bb503aa43;hb=9464c7cf61b9433057924c36e6e02f303a00e768;hp=c50d15266c1096d42d61e296ea4da13d34cb57ec;hpb=41689045f6a3cbe0550e1d34e9cc20d2e8c432ba;p=linux-2.6.git

diff --git a/kernel/power/pm.c b/kernel/power/pm.c
index c50d15266..84063ac8f 100644
--- a/kernel/power/pm.c
+++ b/kernel/power/pm.c
@@ -75,6 +75,42 @@ struct pm_dev *pm_register(pm_dev_t type,
 	return dev;
 }
 
+static void __pm_unregister(struct pm_dev *dev)
+{
+	if (dev) {
+		list_del(&dev->entry);
+		kfree(dev);
+	}
+}
+
+/**
+ *	pm_unregister_all - unregister all devices with matching callback
+ *	@callback: callback function pointer
+ *
+ *	Unregister every device that would call the callback passed. This
+ *	is primarily meant as a helper function for loadable modules. It
+ *	enables a module to give up all its managed devices without keeping
+ *	its own private list.
+ */
+ 
+void pm_unregister_all(pm_callback callback)
+{
+	struct list_head *entry;
+
+	if (!callback)
+		return;
+
+	mutex_lock(&pm_devs_lock);
+	entry = pm_devs.next;
+	while (entry != &pm_devs) {
+		struct pm_dev *dev = list_entry(entry, struct pm_dev, entry);
+		entry = entry->next;
+		if (dev->callback == callback)
+			__pm_unregister(dev);
+	}
+	mutex_unlock(&pm_devs_lock);
+}
+
 /**
  *	pm_send - send request to a single device
  *	@dev: device to send to
@@ -203,6 +239,7 @@ int pm_send_all(pm_request_t rqst, void *data)
 }
 
 EXPORT_SYMBOL(pm_register);
+EXPORT_SYMBOL(pm_unregister_all);
 EXPORT_SYMBOL(pm_send_all);
 EXPORT_SYMBOL(pm_active);