git: drm: Sync drm_read() with Linux 4.7.10

[Francois Tigeot]

commit d420a8a88d271f244e34680d0f9bf03c7bf2f5ed
Author: François Tigeot <ftigeot at wolfpond.org>
Date:   Sun Aug 5 17:07:46 2018 +0200

    drm: Sync drm_read() with Linux 4.7.10
    
    This should fix various issues related to multithreaded races
    and make the drm subsystem more robust.

Summary of changes:
 sys/dev/drm/drm_fops.c | 102 ++++++++++++++++++++++++++++---------------------
 1 file changed, 58 insertions(+), 44 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/d420a8a88d271f244e34680d0f9bf03c7bf2f5ed


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