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

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commit a9be202269580ca611c6cebac90eaf1795497800 upstream.

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: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-07-20 13:16:53 -06:00 • committed by Greg Kroah-Hartman
parent 5302e81aa2
commit 1b87f546a0
1 changed files with 8 additions and 0 deletions
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8
io_uring/io_uring.c
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@ -1803,6 +1803,14 @@ fail:
ret = io_issue_sqe(req, issue_flags); ret = io_issue_sqe(req, issue_flags);
if (ret != -EAGAIN) if (ret != -EAGAIN)
break; 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 * We can get EAGAIN for iopolled IO even though we're
* forcing a sync submission from here, since we can't * forcing a sync submission from here, since we can't