From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 29 Jun 2017 12:59:25 +0000 (+0100)
Subject: dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=61894b02716f122dd7662d5d89f5b2245ca551e2;p=openwrt%2Fstaging%2Fblogic.git

dma-buf/sw-sync: Fix the is-signaled test to handle u32 wraparound

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@chris-wilson.co.uk>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629125930.821-2-chris@chris-wilson.co.uk
---

diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
index 69c5ff36e2f9..4d5d8c5e2534 100644
--- a/drivers/dma-buf/sw_sync.c
+++ b/drivers/dma-buf/sw_sync.c
@@ -219,7 +219,7 @@ static bool timeline_fence_signaled(struct dma_fence *fence)
 {
 	struct sync_timeline *parent = dma_fence_parent(fence);
 
-	return (fence->seqno > parent->value) ? false : true;
+	return !__dma_fence_is_later(fence->seqno, parent->value);
 }
 
 static bool timeline_fence_enable_signaling(struct dma_fence *fence)