Handle exception cases to BindBackend

This patch handles below two exception cases properly,
	 - A case that user calls BindBackend second time.
	 - A case that user calls BIndBackend with null parameter.

Change-Id: Ia104226b81b5fcb56fe0111a5d74f27ec4d0ed01
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/src/inference_engine_common_impl.cpp b/src/inference_engine_common_impl.cpp
index b6707e2..8ef900d 100755 (executable)
--- a/src/inference_engine_common_impl.cpp
+++ b/src/inference_engine_common_impl.cpp
@@ -203,6 +203,16 @@ int InferenceEngineCommon::BindBackend(inference_engine_config *config)
 {
     LOGI("ENTER");
 
+       if (mBackendHandle) {
+               LOGE("Already backend engine has been initialized.");
+               return INFERENCE_ENGINE_ERROR_INVALID_OPERATION;
+       }
+
+       if (config == nullptr) {
+               LOGE("config object is invalid.");
+               return INFERENCE_ENGINE_ERROR_INVALID_PARAMETER;
+       }
+
        if (mUseProfiler == true) {
                // Memory usage will be measured between BindBackend ~ UnbindBackend callbacks.
                mProfiler->Start(IE_PROFILER_MEMORY);