linux-kernel - [PATCH 4.9 089/109] dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound

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Date:   Thu,  7 Dec 2017 13:57:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Sean Paul <seanpaul@...omium.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Subject: [PATCH 4.9 089/109] dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 61894b02716f122dd7662d5d89f5b2245ca551e2 upstream.

Use the canonical __dma_fence_is_later() to compare the fence seqno
against the timeline seqno to check if the fence is signaled.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: Sean Paul <seanpaul@...omium.org>
Cc: Gustavo Padovan <gustavo@...ovan.org>
Reviewed-by: Sean Paul <seanpaul@...omium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629125930.821-2-chris@chris-wilson.co.uk
[s/dma_fence/fence/g - gregkh]
Cc: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/dma-buf/sw_sync.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -219,7 +219,7 @@ static bool timeline_fence_signaled(stru
 {
 	struct sync_timeline *parent = fence_parent(fence);
 
-	return (fence->seqno > parent->value) ? false : true;
+	return !__fence_is_later(fence->seqno, parent->value);
 }
 
 static bool timeline_fence_enable_signaling(struct fence *fence)