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cpuidle: move to use bus_get_dev_root()

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Direct access to the struct bus_type dev_root pointer is going away soon
so replace that with a call to bus_get_dev_root() instead, which is what
it is there for.

This allows us to clean up the cpuidle_add_interface() call a bit as it
was only called in one place, with the same argument so just put that
into the function itself.  Note that cpuidle_remove_interface() should
also probably be removed in the future as there are no callers of it for
some reason.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-pm@vger.kernel.org
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230322090557.2943479-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2023-03-22 10:05:57 +01:00
parent af48ab8b39
commit bf6479dbe7
3 changed files with 12 additions and 5 deletions
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2
drivers/cpuidle/cpuidle.c
View File

@ -808,7 +808,7 @@ static int __init cpuidle_init(void)
if (cpuidle_disabled())
return -ENODEV;
return cpuidle_add_interface(cpu_subsys.dev_root);
return cpuidle_add_interface();
}
module_param(off, int, 0444);

2
drivers/cpuidle/cpuidle.h
View File

@ -30,7 +30,7 @@ extern int cpuidle_switch_governor(struct cpuidle_governor *gov);
struct device;
extern int cpuidle_add_interface(struct device *dev);
extern int cpuidle_add_interface(void);
extern void cpuidle_remove_interface(struct device *dev);
extern int cpuidle_add_device_sysfs(struct cpuidle_device *device);
extern void cpuidle_remove_device_sysfs(struct cpuidle_device *device);

13
drivers/cpuidle/sysfs.c
View File

@ -119,11 +119,18 @@ static struct attribute_group cpuidle_attr_group = {
/**
* cpuidle_add_interface - add CPU global sysfs attributes
* @dev: the target device
*/
int cpuidle_add_interface(struct device *dev)
int cpuidle_add_interface(void)
{
return sysfs_create_group(&dev->kobj, &cpuidle_attr_group);
struct device *dev_root = bus_get_dev_root(&cpu_subsys);
int retval;
if (!dev_root)
return -EINVAL;
retval = sysfs_create_group(&dev_root->kobj, &cpuidle_attr_group);
put_device(dev_root);
return retval;
}
/**