Merge tag 'drm-misc-fixes-2018-11-21' of git://anongit.freedesktop.org/drm/drm-misc...

- vc4: Fix NULL deref in async path (Boris)
- vc4: Avoid taking async path for cursor updates when impossible (Boris)
- udmabuf: Fix mmap with PROT_WRITE (Gerd)
- fb-helper: Don't use writeback connectors for fbdev (Paul)

Cc: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20181121155248.GA241511@art_vandelay