6.6-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Weißschuh linux@weissschuh.net
[ 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-v1-2-949f970... 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 --- .../platform/x86/firmware_attributes_class.c | 40 +++++++------------ .../platform/x86/firmware_attributes_class.h | 1 + 2 files changed, 15 insertions(+), 26 deletions(-)
diff --git a/drivers/platform/x86/firmware_attributes_class.c b/drivers/platform/x86/firmware_attributes_class.c index 4801f9f44aaa6..e214efc97311e 100644 --- a/drivers/platform/x86/firmware_attributes_class.c +++ b/drivers/platform/x86/firmware_attributes_class.c @@ -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); diff --git a/drivers/platform/x86/firmware_attributes_class.h b/drivers/platform/x86/firmware_attributes_class.h index 8e0f47cfdf92e..ef6c3764a8349 100644 --- a/drivers/platform/x86/firmware_attributes_class.h +++ b/drivers/platform/x86/firmware_attributes_class.h @@ -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);