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io_uring: always lock in io_apoll_task_func

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From: Dylan Yudaken <dylany@meta.com>

[ upstream commit c06c6c5d27 ]

This is required for the failure case (io_req_complete_failed) and is
missing.

The alternative would be to only lock in the failure path, however all of
the non-error paths in io_poll_check_events that do not do not return
IOU_POLL_NO_ACTION end up locking anyway. The only extraneous lock would
be for the multishot poll overflowing the CQE ring, however multishot poll
would probably benefit from being locked as it will allow completions to
be batched.

So it seems reasonable to lock always.

Signed-off-by: Dylan Yudaken <dylany@meta.com>
Link: https://lore.kernel.org/r/20221124093559.3780686-3-dylany@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2023-09-12 15:01:59 +01:00 committed by Greg Kroah-Hartman
parent 2920cc4c64
commit 1a0aba2bf2
1 changed files with 1 additions and 0 deletions
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1
io_uring/io_uring.c
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@ -5716,6 +5716,7 @@ static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
if (ret > 0)
return;
io_tw_lock(req->ctx, locked);
io_poll_remove_entries(req);
spin_lock(&ctx->completion_lock);
hash_del(&req->hash_node);