netdev - Re: [REGRESSION] NFC broken on Thinkpad T14 Gen since 9c328f5

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Message-ID: <b82d8cc1-2124-417d-95f8-5fed429e2d0e@leemhuis.info>
Date: Fri, 6 Feb 2026 17:24:34 +0100
From: Thorsten Leemhuis <regressions@...mhuis.info>
To: "Lukas K." <kernel@...3.eu>, linux-kernel@...r.kernel.org, krzk@...nel.org
Cc: regressions@...ts.linux.dev, netdev@...r.kernel.org,
 Michael Thalmeier <michael.thalmeier@...e.at>
Subject: Re: [REGRESSION] NFC broken on Thinkpad T14 Gen since 9c328f5

On 2/6/26 16:15, Lukas K. wrote:
> 
> from 6.17.2 to 6.17.3, the integrated NFC reader (driver: nxp-nci_i2c)
> in the Thinkpad T14 Gen 4 (AMD) stopped detecting tags. This can be
> tested by running
> 
> sudo nfctool -1 -p -d nfc0
> 
> Looking at the commits between 6.17.2 and 6.17.3, 9c328f5 (net: nfc:
> nci: Add parameter validation for packet data) was the only one related
> to NFC.
> 
> To see if that commit indeed was the culprit, I reverted it on 6.18.7
> and nfctool is detecting tags again.
> 
> Since the offending commit merely adds some bounds checks, the root
> cause may very well be in another driver in the NFC stack.

Thx for the report. Seems Michael (now CCed) also ran into problems and
tried to fix them, but looks like that effort stalled; but might be good
to know if this fixes your problem, too:

https://lore.kernel.org/all/20260112124819.171028-1-michael.thalmeier@hale.at/

Anyway: Given that the regressions seems to be known for a weeks now
without a fix forthcoming I wonder if we should revert the culprit, as
we are way past what Linus wants to see in a situation like this (see
the "within a week" part in
https://lore.kernel.org/all/CAHk-=wi86AosXs66-yi54+mpQjPu0upxB8ZAfG+LsMyJmcuMSA@mail.gmail.com/
).

Ciao, Thorsten