drm_dev_register — Register DRM device
| int drm_dev_register ( | struct drm_device * dev, | 
| unsigned long flags ); | 
   Register the DRM device dev with the system, advertise device to user-space
   and start normal device operation. dev must be allocated via drm_dev_alloc
   previously.
   
Never call this twice on any device!
   To ensure backward compatibility with existing drivers method this
   function calls the ->load method after registering the device nodes,
   creating race conditions. Usage of the ->load methods is therefore
   deprecated, drivers must perform all initialization before calling
   drm_dev_register.