Driver core: Protect device shutdown from hot unplug events. (6245838f) · Commits · 戴 / test

drivers/base/core.c

+22 −3

Original line number	Diff line number	Diff line
		@@ -1734,10 +1734,25 @@ EXPORT_SYMBOL_GPL(device_move);
		*/
		void device_shutdown(void)
		{
		struct device dev, devn;
		struct device *dev;

		spin_lock(&devices_kset->list_lock);
		/*
		* Walk the devices list backward, shutting down each in turn.
		* Beware that device unplug events may also start pulling
		* devices offline, even as the system is shutting down.
		*/
		while (!list_empty(&devices_kset->list)) {
		dev = list_entry(devices_kset->list.prev, struct device,
		kobj.entry);
		get_device(dev);
		/*
		* Make sure the device is off the kset list, in the
		* event that dev->*->shutdown() doesn't remove it.
		*/
		list_del_init(&dev->kobj.entry);
		spin_unlock(&devices_kset->list_lock);

		list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
		kobj.entry) {
		if (dev->bus && dev->bus->shutdown) {
		dev_dbg(dev, "shutdown\n");
		dev->bus->shutdown(dev);
		@@ -1745,6 +1760,10 @@ void device_shutdown(void)
		dev_dbg(dev, "shutdown\n");
		dev->driver->shutdown(dev);
		}
		put_device(dev);

		spin_lock(&devices_kset->list_lock);
		}
		spin_unlock(&devices_kset->list_lock);
		async_synchronize_full();
		}