Re: [PATCH v4 2/6] nbd: convert to use blk_mq_find_and_get_req()

["yukuai (C)" <yukuai3@huawei.com>]

On 2021/09/08 15:30, Ming Lei wrote:

> > +put_req:
> > +	if (req)
> > +		blk_mq_put_rq_ref(req);
> >   	return ret ? ERR_PTR(ret) : cmd;
>
> After the request's refcnt is dropped, it can be freed immediately, then
> one stale command is returned to caller.

Hi, Ming

It's right this patch leave this problem. Please take a look at patch 3
and patch 4, the problem should be fixed with these patches.

Thanks,
Kuai
> Thanks,
> Ming
>
> .