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

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Message-ID: <ff97b58a-f422-4f15-99d3-cbf60bf90583@lunn.ch>
Date: Sat, 7 Feb 2026 01:38:47 +0100
From: Andrew Lunn <andrew@...n.ch>
To: "Lukas K." <kernel@...3.eu>
Cc: Thorsten Leemhuis <regressions@...mhuis.info>,
	linux-kernel@...r.kernel.org, krzk@...nel.org,
	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 Sat, Feb 07, 2026 at 01:25:29AM +0100, Lukas K. wrote:
> On 06.02.26 17:24, Thorsten Leemhuis wrote:
> > 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/
> 
> Hi Thorsten,
> 
> thanks for the pointer. Tried the patch you linked to and it works for me.
> 
> Don't know how to reply to the linked mail as I'm new to LKML, but one thing
> caught my eye:

If you look at the page you will see:

Message-ID: <20260112124819.171028-1-michael.thalmeier@...e.at>

You can take the message ID and give it to b4:

$ b4 mbox 20260112124819.171028-1-michael.thalmeier@...e.at
Looking up https://lore.kernel.org/r/20260112124819.171028-1-michael.thalmeier%40hale.at
Grabbing thread from lore.kernel.org/all
2 messages in the thread
Saved ./20260112124819.171028-1-michael.thalmeier@...e.at.mbx

You can then open
20260112124819.171028-1-michael.thalmeier@...e.at.mbx in a mail client
as a mailbox and hit group reply to one of the messages.

    Andrew