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ARM: 9361/1: amba: store owner from modules with amba_driver_register()

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Modules registering driver with amba_driver_register() 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
amba bus code, just like we did for platform_driver in
commit 9447057eaff8 ("platform_device: use a macro instead of
platform_driver_register").

Link: https://lore.kernel.org/r/20240326-module-owner-amba-v1-1-4517b091385b@linaro.org

Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Krzysztof Kozlowski 2024-04-02 10:51:08 +01:00 committed by Russell King (Oracle)
parent 4cece76496
commit 5677b17c33
2 changed files with 16 additions and 6 deletions
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11
drivers/amba/bus.c
View File

@ -488,28 +488,31 @@ static int __init amba_stub_drv_init(void)
* waiting on amba_match(). So, register a stub driver to make sure
* amba_match() is called even if no amba driver has been registered.
*/
return amba_driver_register(&amba_proxy_drv);
return __amba_driver_register(&amba_proxy_drv, NULL);
}
late_initcall_sync(amba_stub_drv_init);
/**
* amba_driver_register - register an AMBA device driver
* __amba_driver_register - register an AMBA device driver
* @drv: amba device driver structure
* @owner: owning module/driver
*
* Register an AMBA device driver with the Linux device model
* core. If devices pre-exist, the drivers probe function will
* be called.
*/
int amba_driver_register(struct amba_driver *drv)
int __amba_driver_register(struct amba_driver *drv,
struct module *owner)
{
if (!drv->probe)
return -EINVAL;
drv->drv.owner = owner;
drv->drv.bus = &amba_bustype;
return driver_register(&drv->drv);
}
EXPORT_SYMBOL(amba_driver_register);
EXPORT_SYMBOL(__amba_driver_register);
/**
* amba_driver_unregister - remove an AMBA device driver

11
include/linux/amba/bus.h
View File

@ -112,11 +112,18 @@ extern struct bus_type amba_bustype;
#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
/*
* use a macro to avoid include chaining to get THIS_MODULE
*/
#define amba_driver_register(drv) \
__amba_driver_register(drv, THIS_MODULE)
#ifdef CONFIG_ARM_AMBA
int amba_driver_register(struct amba_driver *);
int __amba_driver_register(struct amba_driver *, struct module *);
void amba_driver_unregister(struct amba_driver *);
#else
static inline int amba_driver_register(struct amba_driver *drv)
static inline int __amba_driver_register(struct amba_driver *drv,
struct module *owner)
{
return -EINVAL;
}