PLF_SERIAL_LEN
dma_buffer = kmalloc(PLF_SERIAL_LEN, GFP_KERNEL);
BUILD_BUG_ON(ETH_ALEN > PLF_SERIAL_LEN);
BUILD_BUG_ON(PLF_FW_VER_LEN > PLF_SERIAL_LEN);
dma_buffer, PLF_SERIAL_LEN);
dma_buffer, PLF_SERIAL_LEN);
memcpy(serial_number, dma_buffer, PLF_SERIAL_LEN);
memset(dma_buffer, 0x00, PLF_SERIAL_LEN);