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io_uring: don't check iopoll if request completes
commit 9b43ef3d52532a0175ed6654618f7db61d390d2e upstream. IOPOLL request should never return IOU_OK, so the following iopoll queueing check in io_issue_sqe() after getting IOU_OK doesn't make any sense as would never turn true. Let's optimise on that and return a bit earlier. It's also much more resilient to potential bugs from mischieving iopoll implementations. Cc: <stable@vger.kernel.org> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/2f8690e2fa5213a2ff292fac29a7143c036cdd60.1701390926.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 5 additions and 1 deletions
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@ -1891,7 +1891,11 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
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io_req_complete_defer(req);
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else
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io_req_complete_post(req, issue_flags);
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} else if (ret != IOU_ISSUE_SKIP_COMPLETE)
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return 0;
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}
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if (ret != IOU_ISSUE_SKIP_COMPLETE)
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return ret;
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/* If the op doesn't have a file, we're not polling for it */
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