diff options
| author | Jens Axboe <axboe@kernel.dk> | 2023-07-20 22:16:53 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-27 09:50:23 +0300 |
| commit | 1b87f546a035bd8b2b4c73cb346344af542d8663 (patch) | |
| tree | b1bb2493f11df2f2473d7413ce7e35ace85f8b7f /io_uring | |
| parent | 5302e81aa2091d7dd59803f0727d1ba35ed2f929 (diff) | |
| download | linux-1b87f546a035bd8b2b4c73cb346344af542d8663.tar.xz | |
io_uring: treat -EAGAIN for REQ_F_NOWAIT as final for io-wq
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>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/io_uring.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 38bc0073a7d4..bd7b8cf8bc67 100644 --- 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 |