Re: [PATCH] nvme-pci: add NVME_QUIRK_NO_SECONDARY_TEMP_THRESH for WD SN740

[Christoph Hellwig <hch@lst.de>]

On Tue, Nov 03, 2026 at 05:31:29AM -0800, Guenter Roeck wrote:
>>> Mark the controller with NVME_QUIRK_NO_SECONDARY_TEMP_THRESH so only
>>> the sensor inputs are exposed.
>>
>> Given that this is an older device I suspect we're not going to
>> see firmware fixes for it.  But given that we had quite a few devices
>> with issues like this, I wonder why nvme-hwmon can't detect these
>> obviously fake values instead and we could drop the quirk?
>>
>
> Question is if the quirk is really needed. Personally I doubt it.
> Normally the thresholds are simply not set. I see that with the NVMEs
> on my system (Samsung SSD 990 PRO) as well. If I set min and max
> values, they are stored and subsequently displayed correctly.
> That means, no, the hwmon driver can _not_ detect if those values
> are fake because it can not distinguish "not set" from "not really
> supported".
>
> I have not seen the patch, but I strongly suspect that it fixes
> a non-issue, unless it can be shown that writing the values has no
> effect.

So should we drop NVME_QUIRK_NO_SECONDARY_TEMP_THRESH entirely?

Robson: what kind of adverse effects do you see without the quirk?