The dev->devname being passed to request_irq in drm_irq.h is null. With the

    old DRM interface, the devname was set in DRM(setunique), but with the
    current DRM interface >=1.1 the devname is not being set in
    DRM(set_busid).
From: Alan Swanson Approved-by: Dave Airlie <airlied@linux.ie>