linux-kernel - Re: [PATCH] nvme: drop bogus nid quirk for multipath devices which passed id test

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Message-ID: <bd91a6c1-cefc-43e2-8dd8-48b7ea241ded@flourine.local>
Date: Wed, 29 Oct 2025 10:45:57 +0100
From: Daniel Wagner <dwagner@...e.de>
To: Christoph Hellwig <hch@....de>
Cc: Daniel Wagner <wagi@...nel.org>, Keith Busch <kbusch@...nel.org>, 
	John Meneghini <jmeneghi@...hat.com>, Bryan Gurney <bgurney@...hat.com>, 
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme: drop bogus nid quirk for multipath devices which
 passed id test

On Wed, Oct 29, 2025 at 08:44:03AM +0100, Christoph Hellwig wrote:
> But more imporantly dropping the quirk for multipath devices is
> fundamentally the wrong thing to do, as we really need proper IDs for
> multipathing. So just add another entry for the Dell device using
> the dell subvendor/subdevice id that does not have the quirk.

The problem it is not possible to distinguish between the two devices
based on subvendor/subdevice ids. I've tried to find some way to keep
those two devices apart, serial numbers but I don't think there is
something usable. Thus the idea to rely our own sanity checks and
enable the feature if these pass.