[regression] LG Gram Laptop Extra Features stopped working

[regression] LG Gram Laptop Extra Features stopped working

[Linux regression tracking (Thorsten Leemhuis)]

Hi, Thorsten here, the Linux kernel's regression tracker.

Jann, I noticed a report about a regression in bugzilla.kernel.org that
appears to be caused directly or indirectly by a change of yours:

3cad1bc010416c ("filelock: Remove locks reliably when fcntl/close race
is detected") [v6.10-rc7]

As many (most?) kernel developers don't keep an eye on the bug tracker,
I decided to write this mail. To quote from
https://bugzilla.kernel.org/show_bug.cgi?id=219075 :

> On my 2023, LG Gram laptop (kernel 6.9.10), the Laptop extra features
> stopped working, and like in
> https://bugzilla.kernel.org/show_bug.cgi?id=218901, none of the
> kernel variables for the are writable. for example, trying to write
> 80 to `/sys/devices/platform/lg-laptop/battery_care_limit` or
> `/sys/class/power_supply/BAT0/charge_control_end_threshold` results
> in 0 when running cat. The same issue occurs when I try set these
> parameters with EndeavorOS.
> 
> 
> Output of `sudo dmesg | grep -iC 3 "lg_laptop" `
> 
> ``
> [    4.283723] ACPI Error: No handler for Region [XIN1] (0000000011d0c87d) [UserDefinedRegion] (20230628/evregion-126)
> [    4.284919] ACPI Error: Region UserDefinedRegion (ID=143) has no handler (20230628/exfldio-261)
> [    4.286191] ACPI Error: Aborting method \_SB.PC00.LPCB.LGEC.SEN1._TMP due to previous error (AE_NOT_EXIST) (20230628/psparse-529)
> [    4.286773] lg_laptop: product: 16ZB90R-G.AA75G  year: 2019
> [    4.292951] input: LG WMI hotkeys as /devices/virtual/input/input6
> [    4.293115] ACPI: battery: new extension: LG Battery Extension
> [    4.293296] resource: resource sanity check: requesting [mem 0x00000000fedc0000-0x00000000fedcffff], which spans more than pnp 00:04 [mem 0xfedc0000-0xfedc7fff]
> ``

6.11-rc1 is still affected.

See the ticket for more details and additional comments. Note, you have
to use bugzilla to reach the reporter, as I sadly[1] can not CCed them
in mails like this.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

[1] because bugzilla.kernel.org tells users upon registration their
"email address will never be displayed to logged out users"

P.S.: let me use this mail to also add the report to the list of tracked
regressions to ensure it's doesn't fall through the cracks:

#regzbot introduced: 3cad1bc010416c6dd780643476bc59ed742436b9
#regzbot title: vfs/platform-drivers: LG Gram Laptop Extra Features
stopped working
#regzbot from: Chris
#regzbot duplicate: https://bugzilla.kernel.org/show_bug.cgi?id=219075
#regzbot ignore-activity