From f42fca9f490a90e2311f03c9ed756055a50054d3 Mon Sep 17 00:00:00 2001
From: Alexander Alekhin <alexander.alekhin@intel.com>
Date: Tue, 15 May 2018 18:38:22 +0300
Subject: [PATCH] cuda: avoid unnecessary cudaStreamSynchronize() call

resolves #11511
---
 modules/core/src/cuda_stream.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/modules/core/src/cuda_stream.cpp b/modules/core/src/cuda_stream.cpp
index 67cb6ad954..d06ae67af9 100644
--- a/modules/core/src/cuda_stream.cpp
+++ b/modules/core/src/cuda_stream.cpp
@@ -594,10 +594,11 @@ namespace
 
     StackAllocator::~StackAllocator()
     {
-        cudaStreamSynchronize(stream_);
-
         if (memStack_ != 0)
+        {
+            cudaStreamSynchronize(stream_);
             memStack_->pool->returnMemStack(memStack_);
+        }
     }
 
     size_t alignUp(size_t what, size_t alignment)
-- 
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