On 1/15/20 7:37 PM, Bijan Mottahedeh wrote:
> req->result is cleared when io_issue_sqe() calls io_read/write_pre()
> routines. Those routines however are not called when the sqe
> argument is NULL, which is the case when io_issue_sqe() is called from
> io_wq_submit_work(). io_issue_sqe() may then examine a stale result if
> a polled request had previously failed with -EAGAIN:
>
> if (ctx->flags & IORING_SETUP_IOPOLL) {
> if (req->result == -EAGAIN)
> return -EAGAIN;
>
> io_iopoll_req_issued(req);
> }
>
> and in turn cause a subsequently completed request to be re-issued in
> io_wq_submit_work().
Looks good, thanks.
--
Jens Axboe
