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io_uring: avoid io-wq -EAGAIN looping for !IOPOLL
[ Upstream commite0deb6a025
] If an opcode handler semi-reliably returns -EAGAIN, io_wq_submit_work() might continue busily hammer the same handler over and over again, which is not ideal. The -EAGAIN handling in question was put there only for IOPOLL, so restrict it to IOPOLL mode only where there is no other recourse than to retry as we cannot wait. Fixes:def596e955
("io_uring: support for IO polling") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/f168b4f24181942f3614dd8ff648221736f572e6.1652433740.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -6939,6 +6939,8 @@ static void io_wq_submit_work(struct io_wq_work *work)
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* wait for request slots on the block side.
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*/
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if (!needs_poll) {
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if (!(req->ctx->flags & IORING_SETUP_IOPOLL))
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break;
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cond_resched();
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continue;
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}
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