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Message-ID: <941f292d-2ce2-d7aa-3d70-01a11ba171cf@leemhuis.info>
Date:   Thu, 5 May 2022 11:52:50 +0200
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From:   Thorsten Leemhuis <regressions@leemhuis.info>
Cc:     Samuel Clark <slc2015@gmail.com>,
        "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
        "regressions@lists.linux.dev" <regressions@lists.linux.dev>,
        LKML <linux-kernel@vger.kernel.org>
To:     Jarkko Nikula <jarkko.nikula@linux.intel.com>
Subject: regression: Null pointer exception on resume from S3 with i2c
 DesignWare driver
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Hi, this is your Linux kernel regression tracker.

I noticed a regression report in bugzilla.kernel.org that afaics nobody
acted upon since it was reported about a week ago, that's why I decided
to forward it to the lists and all people that seemed to be relevant. To
quote from https://bugzilla.kernel.org/show_bug.cgi?id=215907 :

> Running Manjaro on a Gigabyte B660M DS3H DDR4 with custom 5.17 kernel. Confirmed on other distributions and kernels back to 5.12; issue is not present on most recent 5.11 kernel. dmesg traceback points to i2c DesignWare driver, specifically drivers/i2c/busses/i2c-designware-master.c:369. It seems the msgs struct passed in to i2c_dw_xfer_msg is null.
> 
> Similar issue seems to be reported here:  https://lore.kernel.org/lkml/YY5BRrE8bLyvd3PB@smile.fi.intel.com/t/  
> 
> lspci output: https://pastebin.com/MwFM2VBJ
> dmesg from crashed kernel: https://pastebin.com/t6GsHjkq
> kernel config: https://pastebin.com/awrSve5u

Could somebody take a look into this? Or was this discussed somewhere
else already? Or even fixed?

Anyway, to get this tracked:

#regzbot introduced: v5.11..v5.12
#regzbot from: Samuel Clark <slc2015@gmail.com>
#regzbot title: i2c: designware: Null pointer exception on resume from S3
#regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215907

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)

P.S.: As the Linux kernel's regression tracker I deal with a lot of
reports and sometimes miss something important when writing mails like
this. If that's the case here, don't hesitate to tell me in a public
reply, it's in everyone's interest to set the public record straight.

-- 
Additional information about regzbot:

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https://gitlab.com/knurd42/regzbot/-/blob/main/docs/getting_started.md
https://gitlab.com/knurd42/regzbot/-/blob/main/docs/reference.md

The last two documents will explain how you can interact with regzbot
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Hint for reporters: when reporting a regression it's in your interest to
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the regression makes it onto the radar of the Linux kernel's regression
tracker -- that's in your interest, as it ensures your report won't fall
through the cracks unnoticed.

Hint for developers: you normally don't need to care about regzbot once
it's involved. Fix the issue as you normally would, just remember to
include 'Link:' tag in the patch descriptions pointing to all reports
about the issue. This has been expected from developers even before
regzbot showed up for reasons explained in
'Documentation/process/submitting-patches.rst' and
'Documentation/process/5.Posting.rst'.