linux-kernel - [PATCH v2 01/19] ACPI: store owner from modules with acpi_bus_register

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Message-Id: <20240328-b4-module-owner-acpi-v2-1-1e5552c2c69f@linaro.org>
Date: Thu, 28 Mar 2024 20:49:11 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
 Robert Moore <robert.moore@...el.com>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Benson Leung <bleung@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>, 
 Corentin Chary <corentin.chary@...il.com>, 
 "Luke D. Jones" <luke@...nes.dev>, Hans de Goede <hdegoede@...hat.com>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>, 
 Pali Rohár <pali@...nel.org>, 
 Matan Ziv-Av <matan@...alib.org>, Mattia Dongili <malattia@...ux.it>, 
 Azael Avalos <coproscefalo@...il.com>, Ajay Kaher <akaher@...are.com>, 
 Alexey Makhalov <amakhalov@...are.com>, 
 VMware PV-Drivers Reviewers <pv-drivers@...are.com>, 
 Richard Cochran <richardcochran@...il.com>, Theodore Ts'o <tytso@....edu>, 
 "Jason A. Donenfeld" <Jason@...c4.com>
Cc: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org, 
 acpica-devel@...ts.linux.dev, linux-input@...r.kernel.org, 
 netdev@...r.kernel.org, chrome-platform@...ts.linux.dev, 
 platform-driver-x86@...r.kernel.org, 
 "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 01/19] ACPI: store owner from modules with
 acpi_bus_register_driver()

Modules registering driver with acpi_bus_register_driver() often forget to
set .owner field.  The field is used by some of other kernel parts for
reference counting (try_module_get()), so it is expected that drivers
will set it.

Solve the problem by moving this task away from the drivers to the core
ACPI bus code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/acpi/bus.c      | 9 +++++----
 include/acpi/acpi_bus.h | 7 ++++++-
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index d9fa730416f1..eda951032f3c 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -990,25 +990,26 @@ EXPORT_SYMBOL_GPL(acpi_driver_match_device);
    -------------------------------------------------------------------------- */

 /**
- * acpi_bus_register_driver - register a driver with the ACPI bus
+ * __acpi_bus_register_driver - register a driver with the ACPI bus
  * @driver: driver being registered
+ * @owner: owning module/driver
  *
  * Registers a driver with the ACPI bus.  Searches the namespace for all
  * devices that match the driver's criteria and binds.  Returns zero for
  * success or a negative error status for failure.
  */
-int acpi_bus_register_driver(struct acpi_driver *driver)
+int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner)
 {
 	if (acpi_disabled)
 		return -ENODEV;
 	driver->drv.name = driver->name;
 	driver->drv.bus = &acpi_bus_type;
-	driver->drv.owner = driver->owner;
+	driver->drv.owner = owner;

 	return driver_register(&driver->drv);
 }

-EXPORT_SYMBOL(acpi_bus_register_driver);
+EXPORT_SYMBOL(__acpi_bus_register_driver);

 /**
  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 5de954e2b18a..7453be56f855 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -656,7 +656,12 @@ void acpi_scan_lock_release(void);
 void acpi_lock_hp_context(void);
 void acpi_unlock_hp_context(void);
 int acpi_scan_add_handler(struct acpi_scan_handler *handler);
-int acpi_bus_register_driver(struct acpi_driver *driver);
+/*
+ * use a macro to avoid include chaining to get THIS_MODULE
+ */
+#define acpi_bus_register_driver(drv) \
+	__acpi_bus_register_driver(drv, THIS_MODULE)
+int __acpi_bus_register_driver(struct acpi_driver *driver, struct module *owner);
 void acpi_bus_unregister_driver(struct acpi_driver *driver);
 int acpi_bus_scan(acpi_handle handle);
 void acpi_bus_trim(struct acpi_device *start);

-- 
2.34.1