Re: regression: Null pointer exception on resume from S3 with i2c DesignWare driver

[Jarkko Nikula]

Hi

On 5/5/22 12:52, Thorsten Leemhuis wrote:
> > 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@xxxxxxxxxxxxxxxxxx/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@xxxxxxxxx>
> #regzbot title: i2c: designware: Null pointer exception on resume from S3
> #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215907
Thanks for sharing the bug. The reason why it occurs after v5.11 is that 
the i2c-designware support for Alder Lake -S came to v5.12 and issue is 
hiding before it.

Looks like there are suspend/resume issues with i2c-designware on some 
Gigabyte motherboards. I commented in the bugzilla if Samuel can attach 
the ACPI dump there.

Jarkko