How can i use opencl in loop of host program? - opencl

Question

I want to write the input image into the buffer and execute the kernel file in the while loop of the host program (not in the kernel file). I did set OpenCL stuff (context, device, buffer, command queue, etc) out of the while loop, write the image to the buffer I created in the loop, and run the kernel. It works on my desktop, but when i executed it on i.mx6 board, it returns segmentation fault error in second while loop. The code is below.
while (count < 10)
{
unsigned char* input = (unsigned char*)inImg.data;
start = clock();
unsigned char* output = (unsigned char*)malloc(width * height * sizeof(unsigned char));
size_t localWorkSize[2] = { WGX, WGY };
size_t globalWorkSize[2] = { RoundUp(WGX, width), RoundUp(WGY, height) };
cl_mem cl_inImg = clCreateBuffer(context, CL_MEM_READ_ONLY, width * height * sizeof(unsigned char) * inImg.channels(), NULL, &ret);
/*error check*/
cl_mem cl_outImg = clCreateBuffer(context, CL_MEM_WRITE_ONLY, width * height * sizeof(unsigned char) * inImg.channels(), NULL, &ret);
/*error check*/
int filterSize = 5;
int paddingSize = (int)(filterSize / 2) * 2;
int localWidth = WGX + paddingSize;
int localHeight = WGY + paddingSize;
size_t localMemSize = (localWidth * localHeight * sizeof(unsigned char) * inImg.channels());
clEnqueueWriteBuffer(queue, cl_inImg, CL_TRUE, 0, width * height * sizeof(unsigned char) * inImg.channels(), input, 0, NULL, NULL);
cl_int errNum = 0;
errNum = clSetKernelArg(kernel, 0, sizeof(cl_mem), &cl_inImg);
errNum |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &cl_outImg);
errNum |= clSetKernelArg(kernel, 2, localMemSize, NULL);
errNum |= clSetKernelArg(kernel, 3, sizeof(int), &filterSize);
errNum |= clSetKernelArg(kernel, 4, sizeof(int), &localWidth);
errNum |= clSetKernelArg(kernel, 5, sizeof(int), &localHeight);
errNum |= clSetKernelArg(kernel, 6, sizeof(int), &width);
errNum |= clSetKernelArg(kernel, 7, sizeof(int), &height);
/*error check*/
errNum = clEnqueueNDRangeKernel(queue, kernel, 2, NULL,
globalWorkSize, localWorkSize,
0, NULL, NULL);
/*error check*/
clFinish(queue);
errNum = clEnqueueReadBuffer(queue, cl_outImg,
CL_TRUE, 0, width * height * sizeof(unsigned char) * inImg.channels(), output, 0, NULL, NULL);
/*error check*/
}
I can't find where i did incorrectly, because it works normally on my PC.
How should i fix this?