endless loop

qat_poll_mode heuristic;
proxy_ssl_asynch off;
hi, When the upstream is https, using these two configurations will cause nginx cpu 100% and stay in this line all the time. When op_done.job == NULL, can it be considered that the asynchronous task has not been created successfully and should exit this loop and switch to sw mode, instead of looping all the time here，can you tell me why it needs to loop all the time?
https://github.com/intel/QAT_Engine/blob/07012109f0893cfb39ce1108760d58fdb8230eda/qat_hw_rsa.c#L709