From: David Herrmann <dh.herrmann@gmail.com>
Date: Fri, 3 Jan 2014 13:24:19 +0000 (+0100)
Subject: drm: use anon-inode instead of relying on cdevs
X-Git-Tag: v3.15-rc1~51^2~52^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6796cb16c088905bf3af40548fda68c09e6f6ee5;p=pandora-kernel.git

drm: use anon-inode instead of relying on cdevs

DRM drivers share a common address_space across all character-devices of a
single DRM device. This allows simple buffer eviction and mapping-control.
However, DRM core currently waits for the first ->open() on any char-dev
to mark the underlying inode as backing inode of the device. This delayed
initialization causes ugly conditions all over the place:
  if (dev->dev_mapping)
    do_sth();

To avoid delayed initialization and to stop reusing the inode of the
char-dev, we allocate an anonymous inode for each DRM device and reset
filp->f_mapping to it on ->open().

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
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