Commit 93c97dc1 authored Nov 07, 2016 by Imre Deak

drm/i915: Avoid early GPU idling due to race with new request



There is a small race where a new request can be submitted and retired
after the idle worker started to run which leads to idling the GPU too
early. Fix this by deferring the idling to the pending instance of the
worker.

This scenario was pointed out by Chris.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1478510405-11799-2-git-send-email-imre.deak@intel.com

parent 5bd11a34

drivers/gpu/drm/i915/i915_gem.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -2766,6 +2766,13 @@ i915_gem_idle_work_handler(struct work_struct *work)
		goto out_rearm;
		}

		/*
		* New request retired after this work handler started, extend active
		* period until next instance of the work.
		*/
		if (work_pending(work))
		goto out_unlock;

		if (dev_priv->gt.active_requests)
		goto out_unlock;