From: Jens Axboe axboe@kernel.dk
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 --- io_uring/io_uring.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1803,6 +1803,14 @@ fail: 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