kernel/git/stable/linux.git/drivers/acpi/hed.c, branch linux-7.2.y

ACPI: HED: Switch over to devres-based resource management

2026-05-25T14:43:51+00:00

Use the newly introduced devm_acpi_install_notify_handler() for installing an ACPI notify handler and since that function checks the ACPI companion of the owner device against NULL internally, remove the the explicit ACPI companion check from acpi_hed_probe(). No intentional functional impact. Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/7950702.EvYhyI6sBW@rafael.j.wysocki

ACPI: HED: Refine guarding against adding a second instance

2026-05-25T14:43:51+00:00

There can be only one ACPI hardware event device (HED) in use at a time, so acpi_hed_probe() uses static variable hed_handle for guarding against adding a second HED instance, but there is no reason for that variable to hold an ACPI handle, so change it to a bool one. While at it also set that variable at the end of acpi_hed_probe() to avouid the need to clear it when installing the ACPI notify handler fails. Note that ACPI devices are enumerated sequentially, so there's no need for additional locking around the accesses to that variable. No intentional functional impact. Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/2042970.PYKUYFuaPT@rafael.j.wysocki

ACPI: driver: Check ACPI_COMPANION() against NULL during probe

2026-05-11T16:50:06+00:00

Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers. Signed-off-by: Rafael J. Wysocki Reviewed-by: Hans de Goede Reviewed-by: Andy Shevchenko Link: https://patch.msgid.link/4516068.ejJDZkT8p0@rafael.j.wysocki Cc: 7.0+ # 7.0+

ACPI: HED: Convert the driver to a platform one

2025-12-29T20:04:10+00:00

While binding drivers directly to struct acpi_device objects allows basic functionality to be provided, at least in the majority of cases, there are some problems with it, related to general consistency, sysfs layout, power management operation ordering, and code cleanliness. Overall, it is better to bind drivers to platform devices than to their ACPI companions, so convert the ACPI hardware error device (HED) driver to a platform one. While this is not expected to alter functionality, it changes sysfs layout and so it will be visible to user space. Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/8620378.T7Z3S40VBb@rafael.j.wysocki

ACPI: HED: Always initialize before evged

2025-02-18T18:24:29+00:00

When the HED driver is built-in, it initializes after evged because they both are at the same initcall level, so the initialization ordering depends on the Makefile order. However, this prevents RAS records coming in between the evged driver initialization and the HED driver initialization from being handled. If the number of such RAS records is above the APEI HEST error source number, the HEST resources may be exhausted, and that may affect subsequent RAS error reporting. To fix this issue, change the initcall level of HED to subsys_initcall and prevent the driver from being built as a module by changing ACPI_HED in Kconfig from "tristate" to "bool". Signed-off-by: Xiaofei Tan Link: https://patch.msgid.link/20250212063408.927666-1-tanxiaofei@huawei.com [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki

ACPI: bus: Add context argument to acpi_dev_install_notify_handler()

2023-10-06T15:32:51+00:00

Add void *context arrgument to the list of arguments of acpi_dev_install_notify_handler() and modify it to pass that argument as context to acpi_install_notify_handler() instead of its first argument which is problematic in general (for example, if platform drivers used it, they would rather get struct platform_device pointers or pointers to their private data from the context arguments of their notify handlers). Make all of the current callers of acpi_dev_install_notify_handler() take this change into account so as to avoid altering the general functionality. Co-developed-by: Michal Wilczynski Signed-off-by: Michal Wilczynski Signed-off-by: Rafael J. Wysocki

ACPI: HED: Install Notify() handler directly

2023-07-14T16:58:34+00:00

Modify the ACPI HED driver to install its own Notify() handler directly instead of providing an ACPI driver .notify() callback. This will allow the ACPI driver .notify() callback to be eliminated and it will allow the HED driver to be switched over to a platform one in the future. Suggested-by: Rafael J. Wysocki Signed-off-by: Michal Wilczynski [ rjw: Subject and changelog edits, whitespace adjustments ] Signed-off-by: Rafael J. Wysocki

ACPI: make remove callback of ACPI driver void

2022-11-23T18:11:22+00:00

For bus-based driver, device removal is implemented as: 1 device_remove()-> 2 bus->remove()-> 3 driver->remove() Driver core needs no inform from callee(bus driver) about the result of remove callback. In that case, commit fc7a6209d571 ("bus: Make remove callback return void") forces bus_type::remove be void-returned. Now we have the situation that both 1 & 2 of calling chain are void-returned, so it does not make much sense for 3(driver->remove) to return non-void to its caller. So the basic idea behind this change is making remove() callback of any bus-based driver to be void-returned. This change, for itself, is for device drivers based on acpi-bus. Acked-by: Uwe Kleine-König Acked-by: Lee Jones Acked-by: Dmitry Torokhov Reviewed-by: Hans de Goede Signed-off-by: Dawei Li Reviewed-by: Maximilian Luz # for drivers/platform/surface/* Signed-off-by: Rafael J. Wysocki

ACPI: HED: Drop unused ACPI_MODULE_NAME() definition

2021-03-08T15:51:48+00:00

ACPI_MODULE_NAME() is only used by ACPICA message printing which in turn is not used by the ACPI HED driver, so drop that definition from there. No functional impact. Signed-off-by: Rafael J. Wysocki Reviewed-by: Hanjun Guo

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174

2019-05-30T18:26:41+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Kate Stewart Reviewed-by: Richard Fontana Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman