linux-kernel - [RFC 26/29] dma-buf/fence: remove pointless fence_timeline

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Date:	Fri, 15 Jan 2016 12:55:36 -0200
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org, daniels@...labora.com,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: [RFC 26/29] dma-buf/fence: remove pointless fence_timeline_signal at destroy phase

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

All changes to timeline value come through the user via
fence_timeline_signal() calls. When fence_timeline_destroy() is called no
changes on timeline->value happens hence call fence_timeline_signal() with
no increment is pointless.

Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
---
 drivers/dma-buf/fence.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c
index 7a5fc9b..26f5f0f 100644
--- a/drivers/dma-buf/fence.c
+++ b/drivers/dma-buf/fence.c
@@ -136,7 +136,7 @@ EXPORT_SYMBOL(fence_timeline_put);
  * fence_timeline_destroy - destroy a fence_timeline
  * @timeline	[in]	the fence_timeline to destroy
  *
- * This function destroys a timeline. It signals any active fence first.
+ * This function destroys a timeline.
  */
 void fence_timeline_destroy(struct fence_timeline *timeline)
 {
@@ -147,10 +147,6 @@ void fence_timeline_destroy(struct fence_timeline *timeline)
 	 */
 	smp_wmb();
 
-	/*
-	 * signal any children that their parent is going away.
-	 */
-	fence_timeline_signal(timeline, 0);
 	fence_timeline_put(timeline);
 }
 EXPORT_SYMBOL(fence_timeline_destroy);
-- 
2.5.0