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Date:   Tue, 11 Jul 2023 16:12:06 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Sagi Grimberg <sagi@grimberg.me>
Cc:     Christoph Hellwig <hch@lst.de>,
        Linux regressions mailing list <regressions@lists.linux.dev>,
        Pankaj Raghav <p.raghav@samsung.com>,
        Keith Busch <kbusch@kernel.org>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Jens Axboe <axboe@kernel.dk>,
        "Clemens S." <cspringsguth@gmail.com>,
        Martin Belanger <martin.belanger@dell.com>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        John Meneghini <jmeneghi@redhat.com>,
        Hannes Reinecke <hare@suse.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux NVMe <linux-nvme@lists.infradead.org>,
        Kanchan Joshi <joshi.k@samsung.com>,
        Javier Gonzalez <javier.gonz@samsung.com>,
        =?utf-8?B?67CV7KeE7ZmY?= <jh.i.park@samsung.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: Fwd: Need NVME QUIRK BOGUS for SAMSUNG MZ1WV480HCGL-000MV
 (Samsung SM-953 Datacenter SSD)
Message-ID: <2023071135-opt-choosing-51dd@gregkh>
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On Tue, Jul 11, 2023 at 03:14:54PM +0300, Sagi Grimberg wrote:
> 
> > > Well, that "They keep pumping out more and more devices with the same
> > > breakage" and the "new device" comment from Pankaj below bear the
> > > question: should we stop trying to play "whack a mole" with all those
> > > quirk entries and handle devices with duplicate ids just like Windows does?
> > 
> > As far as I can tell Windows completely ignores the IDs.  Which, looking
> > back, I'd love to be able to do as well, but they are already used
> > by udev for the /dev/disk/by-id/ links.   Those are usually not used
> > on desktop systems, as they use the file system labels and UUIDs, but
> > that doesn't work for non-file system uses.
> > 
> > And all this has been working really well with the good old enterprise
> > SSDs, it's just that the cheap consumer devices keep fucking it up.
> > 
> > If we'd take it away now we'd break existing users, which puts us between
> > a rock and a hard place.
> 
> Maybe the compromise would be to add a modparam that tells the driver
> to ignore it altogether (like allow_bogus_identifiers) that would
> default to false. Then people can just workaround the problem instead
> of having the back-and-fourth with the vendor?
> 

Module parameters do not work on a per-device basis, sorry.  This isn't
the 1990's anymore, please do not attempt to add new ones :)

thanks,

greg k-h