commit bc808bced39f4e4b626c5ea8c63d5e41fce7205a upstream.

There are cases where it isn't always safe to block for submission,
even if the caller asked to wait for events as well. Revert the
previous optimization of doing that.

This reverts two commits:

bf7ec93c644cb
c576666863b78

Fixes: c576666863b78 ("io_uring: optimize submit_and_wait API")
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>