[PATCH 01/19] ACPI: store owner from modules with acpi_bus_register_driver()

Krzysztof Kozlowski
2024-03-27T07:44:48Z

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").

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.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