linux-kernel - Re: [PATCH] nvme: Add 48-bit DMA address quirk

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Message-ID: <20210203112645.GA11942@lst.de>
Date:   Wed, 3 Feb 2021 12:26:45 +0100
From:   Christoph Hellwig <hch@....de>
To:     Filippo Sironi <sironi@...zon.de>
Cc:     Christoph Hellwig <hch@....de>, serebrin@...zon.com,
        dwmw@...zon.co.uk, kbusch@...nel.org, axboe@...com,
        sagi@...mberg.me, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme: Add 48-bit DMA address quirk

On Wed, Feb 03, 2021 at 12:22:31PM +0100, Filippo Sironi wrote:
> To avoid issues, it is easier to apply the quirk to all Amazon NVMe 
> controllers for now till the new lines of controllers with the fix comes 
> out.  At that point, we'll be able to restrict the application to the known 
> bad controllers.

No, that is simply not acceptable.  For one we've had enough cases where
knowlege about old devices was lost after a decade or so.  And secondly
shipping more of these broken devices should be as painful as possible
for you so that it preferably does not happen at all.