linux-kernel - [PATCH 5.15 514/530] io_uring/rw: fix errored retry return values

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Message-Id: <20221024113108.274007846@linuxfoundation.org>
Date:   Mon, 24 Oct 2022 13:34:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel test robot <lkp@...el.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.15 514/530] io_uring/rw: fix errored retry return values

From: Pavel Begunkov <asml.silence@...il.com>

[ upstream commit 62bb0647b14646fa6c9aa25ecdf67ad18f13523c ]

Kernel test robot reports that we test negativity of an unsigned in
io_fixup_rw_res() after a recent change, which masks error codes and
messes up the return value in case I/O is re-retried and failed with
an error.

Fixes: 4d9cb92ca41dd ("io_uring/rw: fix short rw error handling")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
Link: https://lore.kernel.org/r/9754a0970af1861e7865f9014f735c70dc60bf79.1663071587.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/io_uring.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2701,7 +2701,7 @@ static bool __io_complete_rw_common(stru
 	return false;
 }
 
-static inline unsigned io_fixup_rw_res(struct io_kiocb *req, unsigned res)
+static inline int io_fixup_rw_res(struct io_kiocb *req, unsigned res)
 {
 	struct io_async_rw *io = req->async_data;