linux-kernel - [PATCH 23/30] staging: sync: Update new fence status with sync_fence_signal

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Date:	Thu, 28 Feb 2013 16:43:19 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Erik Gilling <konkers@...roid.com>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robclark@...il.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	dri-devel@...ts.freedesktop.org,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 23/30] staging: sync: Update new fence status with sync_fence_signal_pt

From: Erik Gilling <konkers@...roid.com>

If a fence's pt is signaled before sync_fence_create is called, the fence
will never transition into the signaled state.  This also address a tiny
race if a merged fence's pt after sync_fence_get_status checks it's status
and before fence->status is updated.

Cc: Maarten Lankhorst <maarten.lankhorst@...onical.com>
Cc: Erik Gilling <konkers@...roid.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Rob Clark <robclark@...il.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: dri-devel@...ts.freedesktop.org
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: Erik Gilling <konkers@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/sync.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 2394189..889ca6e 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -295,6 +295,12 @@ struct sync_fence *sync_fence_create(const char *name, struct sync_pt *pt)
 	list_add(&pt->pt_list, &fence->pt_list_head);
 	sync_pt_activate(pt);
 
+	/*
+	 * signal the fence in case pt was activated before
+	 * sync_pt_activate(pt) was called
+	 */
+	sync_fence_signal_pt(pt);
+
 	return fence;
 }
 EXPORT_SYMBOL(sync_fence_create);
@@ -457,7 +463,13 @@ struct sync_fence *sync_fence_merge(const char *name,
 	if (err < 0)
 		goto err;
 
-	fence->status = sync_fence_get_status(fence);
+	/*
+	 * signal the fence in case one of it's pts were activated before
+	 * they were activated
+	 */
+	sync_fence_signal_pt(list_first_entry(&fence->pt_list_head,
+					      struct sync_pt,
+					      pt_list));
 
 	return fence;
 err:
-- 
1.7.10.4

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