6.6-stable review patch. If anyone has any objections, please let me know.
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From: Pavel Begunkov asml.silence@gmail.com
commit 9b43ef3d52532a0175ed6654618f7db61d390d2e upstream.
IOPOLL request should never return IOU_OK, so the following iopoll queueing check in io_issue_sqe() after getting IOU_OK doesn't make any sense as would never turn true. Let's optimise on that and return a bit earlier. It's also much more resilient to potential bugs from mischieving iopoll implementations.
Cc: stable@vger.kernel.org Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/2f8690e2fa5213a2ff292fac29a7143c036cdd60.170139092... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/io_uring.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -1891,7 +1891,11 @@ static int io_issue_sqe(struct io_kiocb io_req_complete_defer(req); else io_req_complete_post(req, issue_flags); - } else if (ret != IOU_ISSUE_SKIP_COMPLETE) + + return 0; + } + + if (ret != IOU_ISSUE_SKIP_COMPLETE) return ret;
/* If the op doesn't have a file, we're not polling for it */