linux-kernel - Re: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running FW 220TQ,22001

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Message-ID: <20201028171726.GA9897@lst.de>
Date:   Wed, 28 Oct 2020 18:17:26 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jongpil Jung <jongpuls@...il.com>
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gloria.tsai@...tc.com, jongpil19.jung@...sung.com,
        jongheony.kim@...sung.com, dj54.sohn@...sung.com
Subject: Re: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running
 FW 220TQ,22001

On Wed, Oct 28, 2020 at 06:14:21PM +0900, Jongpil Jung wrote:
> LiteON(SSSTC) CL1 device running FW 220TQ,22001 has bugs with simple
> suspend.
> 
> When NVMe device receive D3hot from host, NVMe firmware will do
> garbage collection. While NVMe device do Garbage collection,
> firmware has chance to going incorrect address.

I'm still lost on what this means.  The device doesn't receive 'D3hot'
from the host, it receives a shutdown request.  And we don't just do
that when hibernating, but also when doing an actual shutdown, a suspend
to disk, unbinding the driver, etc.  So if the device has a problem
with shutdowns we really are in trouble.