ocl: workaround for subbuffer memory leaks

modules/ocl/src/cl_operations.cpp

@@ -148,11 +148,27 @@ void openCLMallocPitchEx(Context *ctx, void **dev_ptr, size_t *pitch,
 {
     cl_int status;
     size_t size = widthInBytes * height;
+    bool useSubBuffers =
 #ifndef MEMORY_CORRUPTION_GUARD
+            false;
+#else
+            true;
+#endif
+    const DeviceInfo& devInfo = ctx->getDeviceInfo();
+    if (useSubBuffers && devInfo.isIntelDevice)
+    {
+        useSubBuffers = false; // TODO FIXIT We observe memory leaks then we working with sub-buffers
+                               // on the CPU device of Intel OpenCL SDK (Linux). We will investigate this later.
+    }
+    if (!useSubBuffers)
+    {
         *dev_ptr = clCreateBuffer(getClContext(ctx), gDevMemRWValueMap[rw_type]|gDevMemTypeValueMap[mem_type],
                                   size, 0, &status);
         openCLVerifyCall(status);
-#else
+    }
+#ifdef MEMORY_CORRUPTION_GUARD
+    else
+    {
         size_t allocSize = size + __memory_corruption_guard_bytes * 2;
         cl_mem mainBuffer = clCreateBuffer(getClContext(ctx), gDevMemRWValueMap[rw_type]|gDevMemTypeValueMap[mem_type],
                 allocSize, 0, &status);
@@ -177,6 +193,7 @@ void openCLMallocPitchEx(Context *ctx, void **dev_ptr, size_t *pitch,
 #endif
         CheckBuffers data(mainBuffer, size, widthInBytes, height);
         __check_buffers.insert(std::pair<cl_mem, CheckBuffers>((cl_mem)*dev_ptr, data));
+    }
 #endif
     *pitch = widthInBytes;
 }
@@ -230,6 +247,7 @@ void openCLCopyBuffer2D(Context *ctx, void *dst, size_t dpitch, int dst_offset,
 
 void openCLFree(void *devPtr)
 {
+    openCLSafeCall(clReleaseMemObject((cl_mem)devPtr));
 #ifdef MEMORY_CORRUPTION_GUARD
 #ifdef CHECK_MEMORY_CORRUPTION
     bool failBefore = false, failAfter = false;
@@ -270,9 +288,7 @@ void openCLFree(void *devPtr)
         openCLSafeCall(clReleaseMemObject(data.mainBuffer));
         __check_buffers.erase(i);
     }
-#endif
-    openCLSafeCall(clReleaseMemObject((cl_mem)devPtr));
-#if defined(MEMORY_CORRUPTION_GUARD) && defined(CHECK_MEMORY_CORRUPTION)
+#if defined(CHECK_MEMORY_CORRUPTION)
     if (failBefore)
     {
 #ifdef CHECK_MEMORY_CORRUPTION_PRINT_ERROR
@@ -291,7 +307,8 @@ void openCLFree(void *devPtr)
         CV_Error(CV_StsInternal, "Memory corruption detected: after buffer");
 #endif
     }
-#endif
+#endif // CHECK_MEMORY_CORRUPTION
+#endif // MEMORY_CORRUPTION_GUARD
 }
 
 cl_kernel openCLGetKernelFromSource(const Context *ctx, const cv::ocl::ProgramEntry* source, string kernelName)