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Commit 978d6fac authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
Browse files

serdev: fix controller-allocation error handling 



Reorder controller initialisation so that in the unlikely event that id
allocation fails, we don't end up releasing id 0 in the destructor.

Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 08fcee28

drivers/tty/serdev/core.c

+14 −9
Original line number Diff line number Diff line
@@ -358,26 +358,31 @@ struct serdev_controller *serdev_controller_alloc(struct device *parent, 
	if (!ctrl)

		return NULL;



	device_initialize(&ctrl->dev);

	ctrl->dev.type = &serdev_ctrl_type;

	ctrl->dev.bus = &serdev_bus_type;

	ctrl->dev.parent = parent;

	ctrl->dev.of_node = parent->of_node;

	serdev_controller_set_drvdata(ctrl, &ctrl[1]);



	id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);

	if (id < 0) {

		dev_err(parent,

			"unable to allocate serdev controller identifier.\n");

		serdev_controller_put(ctrl);

		return NULL;

		goto err_free;

	}



	ctrl->nr = id;



	device_initialize(&ctrl->dev);

	ctrl->dev.type = &serdev_ctrl_type;

	ctrl->dev.bus = &serdev_bus_type;

	ctrl->dev.parent = parent;

	ctrl->dev.of_node = parent->of_node;

	serdev_controller_set_drvdata(ctrl, &ctrl[1]);



	dev_set_name(&ctrl->dev, "serial%d", id);



	dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);

	return ctrl;



err_free:

	kfree(ctrl);



	return NULL;

}

EXPORT_SYMBOL_GPL(serdev_controller_alloc);