On Sat, Oct 21, 2017 at 01:34:00PM +0800, Zhengui Li wrote:
> From: Zhengui <lizhengui@huawei.com>
> 
> In blk_remove_bs, all I/O should be completed before removing throttle
> timers. If there has inflight I/O, removing throttle timers here will
> cause the inflight I/O never return.
> This patch add bdrv_drained_begin before throttle_timers_detach_aio_context
> to let all I/O completed before removing throttle timers.
> 
> Signed-off-by: Zhengui <lizhengui@huawei.com>
> ---
>  block/block-backend.c | 4 ++++
>  1 file changed, 4 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>