linux-kernel - Re: [PATCH v3 0/3] ACPI: SBS: Fix various issues

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Date:   Thu, 30 Mar 2023 19:02:50 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Armin Wolf <W_Armin@....de>
Cc:     rafael@...nel.org, lenb@...nel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] ACPI: SBS: Fix various issues

On Fri, Mar 24, 2023 at 9:26 PM Armin Wolf <W_Armin@....de> wrote:
>
> On my Acer Travelmate 4002WLMi, the system locks up upon
> suspend/shutdown. After a lot of research, it turned out
> that the sbs module was the culprit. The driver would not
> correctly mask out the value used to select a battery using
> the "Smart Battery Selector" (subset of the "Smart Battery Manager").
> This accidentally caused a invalid power source to be selected,
> which was automatically corrected by the selector. Upon
> notifing the host about the corrected power source, some batteries
> would be selected for re-reading, causing a endless loop.
> This would lead to some workqueues filling up, which caused the
> lockup upon suspend/shutdown.
>
> The first patch fixes an issue inside the ec driver regarding the
> removal of query handlers discovered thru ACPI. The second patch fixes
> a kernel oops on module removal caused by a race condition when removing
> custom EC query handlers. The last patch finally fixes the
> suspend/shutdown issues.
>
> As a side note: This was the first machine on which i installed Linux,
> to finally fixing this took ~5 years of tinkering.
>
> Tested on a Acer Travelmate 4002WLMi.
> ---
> Changes in v3:
> - Rework solution for the kernel oops on module removal
> Changes in v2:
> - make acpi_ec_add_query_handler() static to fix warning
>
> Armin Wolf (3):
>   ACPI: EC: Limit explicit removal of query handlers to custom query
>     handlers
>   ACPI: EC: Fix oops when removing custom query handlers
>   ACPI: SBS: Fix handling of Smart Battery Selectors
>
>  drivers/acpi/ec.c  | 17 ++++++++++++++---
>  drivers/acpi/sbs.c | 27 ++++++++++++++++++---------
>  2 files changed, 32 insertions(+), 12 deletions(-)
>
> --

All applied as 6.4 material with a minor comment adjustment in the first patch.

Thanks!