tree c184d7d430b3ec222e91e2773290c722088844fa
parent 9a6a644096a1066c2ef5c47db0db79ac72af7967
author Chris Wilson <chris@chris-wilson.co.uk> 1561467669 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1561490242 +0100

drm/i915/execlists: Convert recursive defer_request() into iterative

As this engine owns the lock around rq->sched.link (for those waiters
submitted to this engine), we can use that link as an element in a local
list. We can thus replace the recursive algorithm with an iterative walk
over the ordered list of waiters.

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/20190625130128.11009-1-chris@chris-wilson.co.uk