/**
* sysdev_shutdown - Shut down all system devices.
*
* Loop over each class of system devices, and the devices in each
* of those classes. For each device, we call the shutdown method for
/**
* sysdev_shutdown - Shut down all system devices.
*
* Loop over each class of system devices, and the devices in each
* of those classes. For each device, we call the shutdown method for