ACPI: platform_profile: Use guard(mutex) for register/unregister

guard(mutex) can be used to automatically release mutexes when going
out of scope.

Tested-by: Mark Pearson <[email protected]>
Tested-by: Matthew Schwartz <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Mark Pearson <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Reviewed-by: Armin Wolf <[email protected]>
Signed-off-by: Mario Limonciello <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ilpo Järvinen <[email protected]>

Author: superm1

drivers/acpi/platform_profile.c

@@ -184,32 +184,26 @@ int platform_profile_register(struct platform_profile_handler *pprof)
 		return -EINVAL;
 	}
 
-	mutex_lock(&profile_lock);
+	guard(mutex)(&profile_lock);
 	/* We can only have one active profile */
-	if (cur_profile) {
-		mutex_unlock(&profile_lock);
+	if (cur_profile)
 		return -EEXIST;
-	}
 
 	err = sysfs_create_group(acpi_kobj, &platform_profile_group);
-	if (err) {
-		mutex_unlock(&profile_lock);
+	if (err)
 		return err;
-	}
 
 	cur_profile = pprof;
-	mutex_unlock(&profile_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_profile_register);
 
 int platform_profile_remove(struct platform_profile_handler *pprof)
 {
-	sysfs_remove_group(acpi_kobj, &platform_profile_group);
+	guard(mutex)(&profile_lock);
 
-	mutex_lock(&profile_lock);
+	sysfs_remove_group(acpi_kobj, &platform_profile_group);
 	cur_profile = NULL;
-	mutex_unlock(&profile_lock);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(platform_profile_remove);