linux-kernel - Re: [PATCH 0/8]: blk-mq: use static

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Message-ID: <1553008222.152266.43.camel@acm.org>
Date:   Tue, 19 Mar 2019 08:10:22 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     "jianchao.wang" <jianchao.w.wang@...cle.com>, axboe@...nel.dk
Cc:     linux-block@...r.kernel.org, jsmart2021@...il.com,
        sagi@...mberg.me, josef@...icpanda.com,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        keith.busch@...el.com, hare@...e.de, jthumshirn@...e.de, hch@....de
Subject: Re: [PATCH 0/8]: blk-mq: use static_rqs to iterate busy tags

On Tue, 2019-03-19 at 09:25 +0800, jianchao.wang wrote:
> Do you mean this patch from Jens ?
> https://marc.info/?l=linux-block&m=154534605914798&w=2
> 
> +	rcu_read_lock();
>  	sbitmap_for_each_set(&bt->sb, bt_iter, &iter_data);
> +	rcu_read_unlock();
> 
> The busy_iter_fn could sleep for nvme
> blk_mq_check_expired
>   -> blk_mq_rq_timed_out
>     -> q->mq_ops->timeout
>        nvme_timeout
>          -> nvme_dev_disable
>             -> mutex_lock dev->shutdown_lock

Hi Jianchao,

I think that's an additional reason to rewrite NVMe error handling ...

Best regards,

Bart.