From: Pavel Begunkov asml.silence@gmail.com
[ upstream commit 108893ddcc4d3aa0a4a02aeb02d478e997001227 ]
send zc is not restricted to !IO_URING_F_UNLOCKED anymore and so we can't use task-tw ordering trick to order notification cqes with requests completions. In this case leave it alone and let io_send_zc_cleanup() flush it.
Cc: stable@vger.kernel.org Fixes: 53bdc88aac9a2 ("io_uring/notif: order notif vs send CQEs") Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/0031f3a00d492e814a4a0935a2029a46d9c9ba06.166448654... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/net.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/io_uring/net.c +++ b/io_uring/net.c @@ -1073,8 +1073,14 @@ int io_send_zc(struct io_kiocb *req, uns else if (zc->done_io) ret = zc->done_io;
- io_notif_flush(zc->notif); - req->flags &= ~REQ_F_NEED_CLEANUP; + /* + * If we're in io-wq we can't rely on tw ordering guarantees, defer + * flushing notif to io_send_zc_cleanup() + */ + if (!(issue_flags & IO_URING_F_UNLOCKED)) { + io_notif_flush(zc->notif); + req->flags &= ~REQ_F_NEED_CLEANUP; + } io_req_set_res(req, ret, IORING_CQE_F_MORE); return IOU_OK; }