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io_uring: don't attempt IO reissue from the ring exit path

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[ Upstream commit 7c977a58dc83366e488c217fd88b1469d242bee5 ]

If we're exiting the ring, just let the IO fail with -EAGAIN as nobody
will care anyway. It's not the right context to reissue from.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Axboe 2021-02-23 19:17:35 -07:00 committed by Greg Kroah-Hartman
parent 40345b9c9d
commit 3c08f772ad
1 changed files with 7 additions and 0 deletions
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7
fs/io_uring.c
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@ -2617,6 +2617,13 @@ static bool io_rw_reissue(struct io_kiocb *req, long res)
return false;
if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
return false;
/*
* If ref is dying, we might be running poll reap from the exit work.
* Don't attempt to reissue from that path, just let it fail with
* -EAGAIN.
*/
if (percpu_ref_is_dying(&req->ctx->refs))
return false;
ret = io_sq_thread_acquire_mm(req->ctx, req);