linux-kernel - Re: [PATCH] NVMe: do not touch sq door bell if nvmeq has been suspended

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Date:	Tue, 2 Feb 2016 16:33:10 +0200
From:	Sagi Grimberg <sagig@....mellanox.co.il>
To:	Keith Busch <keith.busch@...el.com>
Cc:	Wenbo Wang <wenbo.wang@...blaze.com>, Jens Axboe <axboe@...com>,
	Wenbo Wang <mail_weber_wang@....com>,
	"Wenwei.Tao" <wenwei.tao@...blaze.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH] NVMe: do not touch sq door bell if nvmeq has been
 suspended

Hey Keith,

>> First of all, I think we need to cancel all
>> inflight requests before nvme_dev_unmap.
>
> IO cancelling is where it is because it protects against host memory
> corruption. If you're going to mess with the ordering, just make sure
> the PCI device is disabled from bus mastering first.

Little help? :)

What corruption is the ordering protecting against?