qed: Use a coroutine for need_check_timer
This fixes the last place where we degraded from AIO to actual blocking synchronous I/O requests. Putting it into a coroutine means that instead of blocking, the coroutine simply yields while doing I/O. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
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