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platform/x86: firmware_attributes_class: Simplify API

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[ Upstream commit d03cfde56f5cf9ec50b4cf099a42bf056fc80ddd ]

The module core already guarantees that a module can only be unloaded
after all other modules using its symbols have been unloaded.
As it's already the responsibility of the drivers using
firmware_attributes_class to clean up their devices before unloading,
the lifetime of the firmware_attributes_class can be bound to the
lifetime of the module.
This enables the direct usage of firmware_attributes_class from the
drivers, without having to go through the lifecycle functions,
leading to simplifications for both the subsystem and its users.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Link: https://lore.kernel.org/r/20250104-firmware-attributes-simplify-v1-2-949f9709e405@weissschuh.net
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Stable-dep-of: 5ff1fbb30597 ("platform/x86: think-lmi: Fix class device unregistration")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Weißschuh
2025-01-04 00:05:10 +01:00
committed by Greg Kroah-Hartman
parent e52b896d5f
commit ee813c62af
2 changed files with 15 additions and 26 deletions
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40
drivers/platform/x86/firmware_attributes_class.c
View File

@@ -2,47 +2,35 @@
/* Firmware attributes class helper module */
#include <linux/mutex.h>
#include <linux/module.h>
#include "firmware_attributes_class.h"
static DEFINE_MUTEX(fw_attr_lock);
static int fw_attr_inuse;
static const struct class firmware_attributes_class = {
const struct class firmware_attributes_class = {
.name = "firmware-attributes",
};
EXPORT_SYMBOL_GPL(firmware_attributes_class);
static __init int fw_attributes_class_init(void)
{
return class_register(&firmware_attributes_class);
}
module_init(fw_attributes_class_init);
static __exit void fw_attributes_class_exit(void)
{
class_unregister(&firmware_attributes_class);
}
module_exit(fw_attributes_class_exit);
int fw_attributes_class_get(const struct class **fw_attr_class)
{
int err;
mutex_lock(&fw_attr_lock);
if (!fw_attr_inuse) { /*first time class is being used*/
err = class_register(&firmware_attributes_class);
if (err) {
mutex_unlock(&fw_attr_lock);
return err;
}
}
fw_attr_inuse++;
*fw_attr_class = &firmware_attributes_class;
mutex_unlock(&fw_attr_lock);
return 0;
}
EXPORT_SYMBOL_GPL(fw_attributes_class_get);
int fw_attributes_class_put(void)
{
mutex_lock(&fw_attr_lock);
if (!fw_attr_inuse) {
mutex_unlock(&fw_attr_lock);
return -EINVAL;
}
fw_attr_inuse--;
if (!fw_attr_inuse) /* No more consumers */
class_unregister(&firmware_attributes_class);
mutex_unlock(&fw_attr_lock);
return 0;
}
EXPORT_SYMBOL_GPL(fw_attributes_class_put);

1
drivers/platform/x86/firmware_attributes_class.h
View File

@@ -7,6 +7,7 @@
#include <linux/device/class.h>
extern const struct class firmware_attributes_class;
int fw_attributes_class_get(const struct class **fw_attr_class);
int fw_attributes_class_put(void);