[REGRESSION] *ERROR* Cannot create /sys/kernel/debug/dri/0

[REGRESSION] *ERROR* Cannot create /sys/kernel/debug/dri/0

[Gabriel Feceoru]

Hi Dave, Daniel,


This is a regression causing many failures in intel-gfx CI.


[  295.164523] [drm:drm_debugfs_init] *ERROR* Cannot create 
/sys/kernel/debug/dri/0
[  295.164531] [drm:drm_minor_register] *ERROR* DRM: Failed to 
initialize /sys/kernel/debug/dri.
[  295.167544] i915: probe of 0000:00:02.0 failed with error -1


After bisect:

commit d2307dea14a4f14a4b5db01b6d40a30fa6117e6c
Author: Dave Airlie <airlied@redhat.com>
Date:   Wed Apr 27 11:27:39 2016 +1000

     drm/atomic: use connector references (v3)

     Take a reference when setting a crtc on a connecter,
     also take one when duplicating if a crtc is set,
     and drop one on destroy if a crtc is set.

     v2: take Daniel Stone's advice and simplify the
     ref/unref dances, also take care of NULL as connector
     to state reset.

     v3: remove need for connector NULL check.

     Reviewed-by: Daniel Stone <daniels@collabora.com>
     Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
     Signed-off-by: Dave Airlie <airlied@redhat.com>

Regards,
Gabriel
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