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

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Date:   Fri, 24 Mar 2023 21:26:25 +0100
From:   Armin Wolf <W_Armin@....de>
To:     rafael@...nel.org, lenb@...nel.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] ACPI: SBS: Fix various issues

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(-)

--
2.30.2