tree d737d3da7177c8e68bf3b68e8b5372ce1b5bd97e
parent 754f7a0b2a13fa601c4ea494f726214c07b81e08
author Chris Wilson <chris@chris-wilson.co.uk> 1559035796 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1559043929 +0100

drm/i915: Drop the deferred active reference

An old optimisation to reduce the number of atomics per batch sadly
relies on struct_mutex for coordination. In order to remove struct_mutex
from serialising object/context closing, always taking and releasing an
active reference on first use / last use greatly simplifies the locking.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-15-chris@chris-wilson.co.uk