Multiple drivers may attempt to register platform profile handlers, but only one may be registered and the behavior is non-deterministic for which one wins. It's mostly controlled by probing order. This can be problematic if one driver changes CPU settings and another driver notifies the EC for changing fan curves. Modify the ACPI platform profile handler to let multiple drivers register platform profile handlers and abstract this detail from userspace. To avoid undefined behaviors only offer profiles that are commonly advertised across multiple handlers. If any problems occur when changing profiles for any driver, then the drivers that were already changed remain changed and the legacy sysfs handler will report 'custom'. Tested-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx> Tested-by: Matthew Schwartz <matthew.schwartz@xxxxxxxxx> Reviewed-by: Mark Pearson <mpearson-lenovo@xxxxxxxxx> Reviewed-by: Armin Wolf <W_Armin@xxxxxx> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> --- v7: * rebase v6: * rebase v5: * reword commit message --- drivers/acpi/platform_profile.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c index e88b355a72112..7d774c43f4fa7 100644 --- a/drivers/acpi/platform_profile.c +++ b/drivers/acpi/platform_profile.c @@ -10,7 +10,6 @@ #include <linux/platform_profile.h> #include <linux/sysfs.h> -static struct platform_profile_handler *cur_profile; static DEFINE_MUTEX(profile_lock); static const char * const profile_names[] = { @@ -400,8 +399,6 @@ static const struct attribute_group platform_profile_group = { void platform_profile_notify(struct platform_profile_handler *pprof) { - if (!cur_profile) - return; scoped_cond_guard(mutex_intr, return, &profile_lock) { class_for_each_device(&platform_profile_class, NULL, NULL, _notify_class_profile); @@ -465,9 +462,6 @@ int platform_profile_register(struct platform_profile_handler *pprof) } guard(mutex)(&profile_lock); - /* We can only have one active profile */ - if (cur_profile) - return -EEXIST; /* create class interface for individual handler */ pprof->minor = ida_alloc(&platform_profile_ida, GFP_KERNEL); @@ -483,8 +477,6 @@ int platform_profile_register(struct platform_profile_handler *pprof) sysfs_notify(acpi_kobj, NULL, "platform_profile"); - cur_profile = pprof; - err = sysfs_update_group(acpi_kobj, &platform_profile_group); if (err) goto cleanup_cur; @@ -492,7 +484,6 @@ int platform_profile_register(struct platform_profile_handler *pprof) return 0; cleanup_cur: - cur_profile = NULL; device_unregister(pprof->class_dev); cleanup_ida: @@ -507,8 +498,6 @@ int platform_profile_remove(struct platform_profile_handler *pprof) int id; guard(mutex)(&profile_lock); - cur_profile = NULL; - id = pprof->minor; device_unregister(pprof->class_dev); ida_free(&platform_profile_ida, id); -- 2.43.0