linux-kernel - [PATCH 3.4 121/146] drm/i915: Don't skip request retirement if the active list is empty

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Date:	Tue, 15 Sep 2015 17:03:56 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 121/146] drm/i915: Don't skip request retirement if the active list is empty

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

3.4.109-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 0aedb1626566efd72b369c01992ee7413c82a0c5 upstream.

Apparently we can have requests even if though the active list is empty,
so do the request retirement regardless of whether there's anything
on the active list.

The way it happened here is that during suspend intel_ring_idle()
notices the olr hanging around and then proceeds to get rid of it by
adding a request. However since there was nothing on the active lists
i915_gem_retire_requests() didn't clean those up, and so the idle work
never runs, and we leave the GPU "busy" during suspend resulting in a
WARN later.

Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b1f1d10..e1c744d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1779,9 +1779,6 @@ i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 	uint32_t seqno;
 	int i;
 
-	if (list_empty(&ring->request_list))
-		return;
-
 	WARN_ON(i915_verify_lists(ring->dev));
 
 	seqno = ring->get_seqno(ring);
-- 
1.9.1

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