From 9b43ef3d52532a0175ed6654618f7db61d390d2e Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Fri, 1 Dec 2023 00:38:52 +0000
Subject: [PATCH] io_uring: don't check iopoll if request completes

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/2f8690e2fa5213a2ff292fac29a7143c036cdd60.1701390926.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 io_uring/io_uring.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 9626a363f1213..828d0975c270d 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1898,7 +1898,11 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
 			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 */
-- 
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