fixes

modules/core/src/ocl.cpp

@@ -4516,7 +4516,14 @@ public:
                     }
                     else
                     {
-                        // nothing with CL_MEM_USE_HOST_PTR
+                        // CL_MEM_USE_HOST_PTR (nothing is required) and OTHER cases
+                        cl_int retval = 0;
+                        void* data = clEnqueueMapBuffer(q, (cl_mem)u->handle, CL_TRUE,
+                                                        (CL_MAP_READ | CL_MAP_WRITE),
+                                                        0, u->size, 0, 0, 0, &retval);
+                        CV_OclDbgAssert(retval == CL_SUCCESS);
+                        CV_OclDbgAssert(clEnqueueUnmapMemObject(q, (cl_mem)u->handle, data, 0, 0, 0) == CL_SUCCESS);
+                        CV_OclDbgAssert(clFinish(q) == CL_SUCCESS);
                     }
                 }
                 u->markHostCopyObsolete(false);

modules/core/test/test_umat.cpp

@@ -897,8 +897,9 @@ TEST(UMat, ReadBufferRect)
     EXPECT_MAT_NEAR(t, t2, 0);
 }
 
+
 // Use iGPU or OPENCV_OPENCL_DEVICE=:CPU: to catch problem
-TEST(UMat, DISABLED_synchronization_map_unmap)
+TEST(UMat, synchronization_map_unmap)
 {
     class TestParallelLoopBody : public cv::ParallelLoopBody
     {
@@ -935,6 +936,7 @@ TEST(UMat, DISABLED_synchronization_map_unmap)
     }
 }
 
+
 TEST(UMat, async_unmap)
 {
     for (int i = 0; i < 20; i++)
@@ -961,6 +963,7 @@ TEST(UMat, async_unmap)
     }
 }
 
+
 TEST(UMat, unmap_in_class)
 {
     class Logic
@@ -1024,7 +1027,7 @@ TEST(UMat, map_unmap_counting)
 
 
 
-TEST(UMat, Test_same_behaviour_read_and_read)
+TEST(UMat, DISABLED_Test_same_behaviour_read_and_read)
 {
     bool exceptionDetected = false;
     try