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From: Tor Vic <torvic9@mailbox.org>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-i2c@vger.kernel.org
Cc: benjamin.bara@skidata.com, dmitry.osipenko@collabora.com
Subject: [Bug Report] [6.6] i2c: No atomic i2c transfer handler
Date: Fri, 1 Dec 2023 11:48:40 +0100	[thread overview]
Message-ID: <13271b9b-4132-46ef-abf8-2c311967bb46@mailbox.org> (raw)

Hi,

Since Linux 6.6.3, I see some warnings in the late phase of shutdown.
Unfortunately, they are not logged because syslog has already shut down 
at that point.

I used a camera to capture a small part of the warnings:

   No atomic I2C transfer handler for 'i2c-0'
   [trace follows]
   i2c_smbus_xfer
   [...]

After checking the changelog, the culprit was found quickly:

   (3473cf43b) i2c: core: Run atomic i2c xfer when !preemptible

Reverting that commit made the warnings go away.

This is a voluntary preemption kernel running on a Skylake laptop.

Please tell me if you need more info.

Cheers,
Tor

             reply	other threads:[~2023-12-01 10:48 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-01 10:48 Tor Vic [this message]
2023-12-01 11:50 ` Dmitry Osipenko
2023-12-01 12:26   ` Tor Vic

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