Commit a9be2022 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq 

io-wq assumes that an issue is blocking, but it may not be if the
request type has asked for a non-blocking attempt. If we get
-EAGAIN for that case, then we need to treat it as a final result
and not retry or arm poll for it.

Cc: stable@vger.kernel.org # 5.10+
Link: https://github.com/axboe/liburing/issues/897


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6adc2272

io_uring/io_uring.c

+8 −0
Original line number Diff line number Diff line
@@ -1948,6 +1948,14 @@ void io_wq_submit_work(struct io_wq_work *work) 
		ret = io_issue_sqe(req, issue_flags);

		if (ret != -EAGAIN)

			break;



		/*

		 * If REQ_F_NOWAIT is set, then don't wait or retry with

		 * poll. -EAGAIN is final for that case.

		 */

		if (req->flags & REQ_F_NOWAIT)

			break;



		/*

		 * We can get EAGAIN for iopolled IO even though we're

		 * forcing a sync submission from here, since we can't