From: David Herrmann <dh.herrmann@gmail.com>
Date: Wed, 29 Jan 2014 09:49:19 +0000 (+0100)
Subject: drm: add minor-lookup/release helpers
X-Git-Tag: v3.15-rc1~51^2~56^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1616c525b98deb34b8f4b02eccf0ae3a1310fa27;p=pandora-kernel.git

drm: add minor-lookup/release helpers

Instead of accessing drm_minors_idr directly, this adds a small helper to
hide the internals. This will help us later to remove the drm_global_mutex
requirement for minor-lookup.

Furthermore, this also makes sure that minor->dev is always valid and
takes a reference-count to the device as long as the minor is used in an
open-file. This way, "struct file*"->private_data->dev is guaranteed to be
valid (which it has to, as we cannot reset it).

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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