linux-kernel - [PATCH 5.7 431/477] io_uring: dont fail links for EAGAIN error in IOPOLL mode

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Date:   Tue, 23 Jun 2020 21:57:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.7 431/477] io_uring: dont fail links for EAGAIN error in IOPOLL mode

From: Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.com>

[ Upstream commit 2d7d67920e5c8e0854df23ca77da2dd5880ce5dd ]

In IOPOLL mode, for EAGAIN error, we'll try to submit io request
again using io-wq, so don't fail rest of links if this io request
has links.

Cc: stable@...r.kernel.org
Signed-off-by: Xiaoguang Wang <xiaoguang.wang@...ux.alibaba.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
@@ -1936,7 +1936,7 @@ static void io_complete_rw_iopoll(struct
 	if (kiocb->ki_flags & IOCB_WRITE)
 		kiocb_end_write(req);
 
-	if (res != req->result)
+	if (res != -EAGAIN && res != req->result)
 		req_set_fail_links(req);
 	req->result = res;
 	if (res != -EAGAIN)