This is a note to let you know that I've just added the patch titled
ACPI: scan: Do not increase dep_unmet for already met dependencies
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-scan-do-not-increase-dep_unmet-for-already-met-dependencies.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d730192ff0246356a2d7e63ff5bd501060670eec Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Sat, 6 Apr 2024 13:40:52 +0200
Subject: ACPI: scan: Do not increase dep_unmet for already met dependencies
From: Hans de Goede <hdegoede@xxxxxxxxxx>
commit d730192ff0246356a2d7e63ff5bd501060670eec upstream.
On the Toshiba Encore WT10-A tablet the BATC battery ACPI device depends
on 3 other devices:
Name (_DEP, Package (0x03) // _DEP: Dependencies
{
I2C1,
GPO2,
GPO0
})
acpi_scan_check_dep() adds all 3 of these to the acpi_dep_list and then
before an acpi_device is created for the BATC handle (and thus before
acpi_scan_dep_init() runs) acpi_scan_clear_dep() gets called for both
GPIO depenencies, with free_when_met not set for the dependencies.
Since there is no adev for BATC yet, there also is no dep_unmet to
decrement. The only result of acpi_scan_clear_dep() in this case is
dep->met getting set.
Soon after acpi_scan_clear_dep() has been called for the GPIO dependencies
the acpi_device gets created for the BATC handle and acpi_scan_dep_init()
runs, this sees 3 dependencies on the acpi_dep_list and initializes
unmet_dep to 3. Later when the dependency for I2C1 is met unmet_dep
becomes 2, but since the 2 GPIO deps where already met it never becomes 0
causing battery monitoring to not work.
Fix this by modifying acpi_scan_dep_init() to not increase dep_met for
dependencies which have already been marked as being met.
Fixes: 3ba12d8de3fa ("ACPI: scan: Reduce overhead related to devices with dependencies")
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: 6.5+ <stable@xxxxxxxxxxxxxxx> # 6.5+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/scan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1798,7 +1798,8 @@ static void acpi_scan_dep_init(struct ac
if (dep->honor_dep)
adev->flags.honor_deps = 1;
- adev->dep_unmet++;
+ if (!dep->met)
+ adev->dep_unmet++;
}
}
}
Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are
queue-6.6/acpi-scan-do-not-increase-dep_unmet-for-already-met-dependencies.patch
