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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, David Laight <david.laight@aculab.com>,
        Pavel Begunkov <asml.silence@gmail.com>,
        Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.10 278/306] fs/io_uring Dont use the return value from import_iovec().
Date:   Thu, 16 Sep 2021 18:00:23 +0200
Message-Id: <20210916155803.557131514@linuxfoundation.org>
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From: David Laight <David.Laight@ACULAB.COM>

[ Upstream commit 10fc72e43352753a08f9cf83aa5c40baec00d212 ]

This is the only code that relies on import_iovec() returning
iter.count on success.
This allows a better interface to import_iovec().

Signed-off-by: David Laight <david.laight@aculab.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/io_uring.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 6978a42fa39b..8de0f52fd29d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3128,7 +3128,7 @@ static ssize_t __io_import_iovec(int rw, struct io_kiocb *req,
 
 		ret = import_single_range(rw, buf, sqe_len, *iovec, iter);
 		*iovec = NULL;
-		return ret < 0 ? ret : sqe_len;
+		return ret;
 	}
 
 	if (req->flags & REQ_F_BUFFER_SELECT) {
@@ -3154,7 +3154,7 @@ static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
 	if (!iorw)
 		return __io_import_iovec(rw, req, iovec, iter, needs_lock);
 	*iovec = NULL;
-	return iov_iter_count(&iorw->iter);
+	return 0;
 }
 
 static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb)
@@ -3423,7 +3423,7 @@ static int io_read(struct io_kiocb *req, bool force_nonblock,
 	if (ret < 0)
 		return ret;
 	iov_count = iov_iter_count(iter);
-	io_size = ret;
+	io_size = iov_count;
 	req->result = io_size;
 	ret = 0;
 
@@ -3552,7 +3552,7 @@ static int io_write(struct io_kiocb *req, bool force_nonblock,
 	if (ret < 0)
 		return ret;
 	iov_count = iov_iter_count(iter);
-	io_size = ret;
+	io_size = iov_count;
 	req->result = io_size;
 
 	/* Ensure we clear previously set non-block flag */
-- 
2.30.2