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io_uring: avoid io-wq -EAGAIN looping for !IOPOLL

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[ Upstream commit e0deb6a025ae8c850dc8685be39fb27b06c88736 ]

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: def596e9557c9 ("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>
This commit is contained in:
Pavel Begunkov 2022-05-13 11:24:56 +01:00 committed by Greg Kroah-Hartman
parent b3cec8a42f
commit 51ebf1b6a0
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -6866,7 +6866,7 @@ static void io_wq_submit_work(struct io_wq_work *work)
* forcing a sync submission from here, since we can't
* wait for request slots on the block side.
*/
if (ret != -EAGAIN)
if (ret != -EAGAIN || !(req->ctx->flags & IORING_SETUP_IOPOLL))
break;
cond_resched();
} while (1);