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Code Issues Releases Wiki Activity

io_uring: fix missing set of EPOLLONESHOT for CQ ring overflow

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

Fixes: 5082620fb2 ("io_uring: terminate multishot poll for CQ ring overflow")
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210922101238.7177-3-haoxu@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hao Xu 2021-09-22 18:12:37 +08:00 committed by Jens Axboe
parent bd99c71bd1
commit a62682f92e
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -5337,8 +5337,10 @@ 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++;