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virtio: store owner from modules with register_virtio_driver()

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Modules registering driver with register_virtio_driver() might forget to
set .owner field.  i2c-virtio.c for example has it missing.  The field
is used by some 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
virtio code, just like we did for platform_driver in
commit 9447057eaf ("platform_device: use a macro instead of
platform_driver_register").

Fixes: 3cfc883804 ("i2c: virtio: add a virtio i2c frontend driver")
Cc: "Jie Deng" <jie.deng@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-Id: <20240331-module-owner-virtio-v2-1-98f04bfaf46a@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Krzysztof Kozlowski 2024-03-31 10:43:48 +02:00 committed by Michael S. Tsirkin
parent df9ace7647
commit ffe6176b7f
3 changed files with 9 additions and 5 deletions
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1
Documentation/driver-api/virtio/writing_virtio_drivers.rst
View File

@ -97,7 +97,6 @@ like this::
static struct virtio_driver virtio_dummy_driver = {
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = virtio_dummy_probe,
.remove = virtio_dummy_remove,

6
drivers/virtio/virtio.c
View File

@ -362,14 +362,16 @@ static const struct bus_type virtio_bus = {
.remove = virtio_dev_remove,
};
int register_virtio_driver(struct virtio_driver *driver)
int __register_virtio_driver(struct virtio_driver *driver, struct module *owner)
{
/* Catch this early. */
BUG_ON(driver->feature_table_size && !driver->feature_table);
driver->driver.bus = &virtio_bus;
driver->driver.owner = owner;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL_GPL(register_virtio_driver);
EXPORT_SYMBOL_GPL(__register_virtio_driver);
void unregister_virtio_driver(struct virtio_driver *driver)
{

7
include/linux/virtio.h
View File

@ -170,7 +170,7 @@ size_t virtio_max_dma_size(const struct virtio_device *vdev);
/**
* struct virtio_driver - operations for a virtio I/O driver
* @driver: underlying device driver (populate name and owner).
* @driver: underlying device driver (populate name).
* @id_table: the ids serviced by this driver.
* @feature_table: an array of feature numbers supported by this driver.
* @feature_table_size: number of entries in the feature table array.
@ -208,7 +208,10 @@ static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv)
return container_of(drv, struct virtio_driver, driver);
}
int register_virtio_driver(struct virtio_driver *drv);
/* use a macro to avoid include chaining to get THIS_MODULE */
#define register_virtio_driver(drv) \
__register_virtio_driver(drv, THIS_MODULE)
int __register_virtio_driver(struct virtio_driver *drv, struct module *owner);
void unregister_virtio_driver(struct virtio_driver *drv);
/* module_virtio_driver() - Helper macro for drivers that don't do