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From: Hao Xu <haoxu@linux.alibaba.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: io-uring@vger.kernel.org, Pavel Begunkov <asml.silence@gmail.com>,
	Joseph Qi <joseph.qi@linux.alibaba.com>
Subject: [PATCH 2/3] io_uring: fix lacking of EPOLLONESHOT
Date: Wed, 22 Sep 2021 18:12:37 +0800	[thread overview]
Message-ID: <20210922101238.7177-3-haoxu@linux.alibaba.com> (raw)
In-Reply-To: <20210922101238.7177-1-haoxu@linux.alibaba.com>

We should set EPOLLONESHOT if cqring_fill_event() returns false since
io_poll_add() decides to put req or not by it.

Fixes: 5082620fb2ca ("io_uring: terminate multishot poll for CQ ring overflow")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
---
 fs/io_uring.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4b0a40ad28b0..b7c9fcce2de2 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -5340,8 +5340,10 @@ static bool __io_poll_complete(struct io_kiocb *req, __poll_t mask)
 	}
 	if (req->poll.events & EPOLLONESHOT)
 		flags = 0;
-	if (!io_cqring_fill_event(ctx, req->user_data, error, flags))
+	if (!io_cqring_fill_event(ctx, req->user_data, error, flags)) {
+		req->poll.events |= EPOLLONESHOT;
 		flags = 0;
+	}
 	if (flags & IORING_CQE_F_MORE)
 		ctx->cq_extra++;
 
-- 
2.24.4


  parent reply	other threads:[~2021-09-22 10:13 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-22 10:12 [PATCH 0/3] poll fixes Hao Xu
2021-09-22 10:12 ` [PATCH 1/3] io_uring: fix race between poll completion and cancel_hash insertion Hao Xu
2021-09-22 10:12 ` Hao Xu [this message]
2021-09-22 10:12 ` [PATCH 3/3] io_uring: fix potential req refcount underflow Hao Xu
2021-09-22 15:55 ` [PATCH 0/3] poll fixes Jens Axboe

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