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

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Message-ID: <20201029023306.GB20928@redsun51.ssa.fujisawa.hgst.com>
Date:   Thu, 29 Oct 2020 11:33:06 +0900
From:   Keith Busch <kbusch@...nel.org>
To:     Gloria Tsai <Gloria.Tsai@...tc.com>
Cc:     Christoph Hellwig <hch@....de>, Jongpil Jung <jongpuls@...il.com>,
        Jens Axboe <axboe@...com>, Sagi Grimberg <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jongpil19.jung@...sung.com" <jongpil19.jung@...sung.com>,
        "jongheony.kim@...sung.com" <jongheony.kim@...sung.com>,
        "dj54.sohn@...sung.com" <dj54.sohn@...sung.com>
Subject: Re: [PATCH V3 1/1] nvme: Add quirk for LiteON CL1 devices running FW
 220TQ,22001

On Thu, Oct 29, 2020 at 02:20:27AM +0000, Gloria Tsai wrote:
> Corrected the description of this bug that SSD will not do GC after receiving shutdown cmd.
> Do GC before shutdown -> delete IO Q -> shutdown from host -> breakup GC -> D3hot -> enter PS4 -> have a chance swap block -> use wrong pointer on device SRAM -> over program

What do you mean by "wrong pointer"? At the place in the sequence you're
referring to, the PCI BME is disabled: you can't access *any* host RAM,
so there's no "correct" pointer either.