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io_uring: add reschedule point to handle_tw_list()

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Commit f586800854 upstream.

If CONFIG_PREEMPT_NONE is set and the task_work chains are long, we
could be running into issues blocking others for too long. Add a
reschedule check in handle_tw_list(), and flush the ctx if we need to
reschedule.

Cc: stable@vger.kernel.org # 5.10+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-07-17 10:27:20 -06:00 • committed by Justin Hammond
parent 9a2e8985c4
commit 549e380d21
1 changed files with 5 additions and 2 deletions
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7
io_uring/io_uring.c
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@ -2217,9 +2217,12 @@ static void tctx_task_work(struct callback_head *cb)
}
req->io_task_work.func(req, &locked);
node = next;
if (unlikely(need_resched())) {
ctx_flush_and_put(ctx, &locked);
ctx = NULL;
cond_resched();
}
} while (node);
cond_resched();
}
ctx_flush_and_put(ctx, &locked);