platform/x86: make fw_attr_class constant

Since commit 43a7206b ("driver core: class: make class_register() take
a const *"), the driver core allows for struct class to be in read-only
memory, so move the fw_attr_class structure to be declared at build time
placing it into read-only memory, instead of having to be dynamically
allocated at boot time.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: "Ricardo B. Marliere" <ricardo@marliere.net>
Link: https://lore.kernel.org/r/20240305-class_cleanup-platform-v1-1-9085c97b9355@marliere.netReviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

drivers/platform/x86/dell/dell-wmi-sysman/sysman.c

@@ -25,7 +25,7 @@ struct wmi_sysman_priv wmi_priv = {
 /* reset bios to defaults */
 static const char * const reset_types[] = {"builtinsafe", "lastknowngood", "factory", "custom"};
 static int reset_option = -1;
-static struct class *fw_attr_class;
+static const struct class *fw_attr_class;
 
 
 /**

drivers/platform/x86/firmware_attributes_class.c

@@ -10,11 +10,11 @@
 static DEFINE_MUTEX(fw_attr_lock);
 static int fw_attr_inuse;
 
-static struct class firmware_attributes_class = {
+static const struct class firmware_attributes_class = {
 	.name = "firmware-attributes",
 };
 
-int fw_attributes_class_get(struct class **fw_attr_class)
+int fw_attributes_class_get(const struct class **fw_attr_class)
 {
 	int err;
 

drivers/platform/x86/firmware_attributes_class.h

@@ -5,7 +5,7 @@
 #ifndef FW_ATTR_CLASS_H
 #define FW_ATTR_CLASS_H
 
-int fw_attributes_class_get(struct class **fw_attr_class);
+int fw_attributes_class_get(const struct class **fw_attr_class);
 int fw_attributes_class_put(void);
 
 #endif /* FW_ATTR_CLASS_H */

drivers/platform/x86/hp/hp-bioscfg/bioscfg.c

@@ -24,7 +24,7 @@ struct bioscfg_priv bioscfg_drv = {
 	.mutex = __MUTEX_INITIALIZER(bioscfg_drv.mutex),
 };
 
-static struct class *fw_attr_class;
+static const struct class *fw_attr_class;
 
 ssize_t display_name_language_code_show(struct kobject *kobj,
 					struct kobj_attribute *attr,

drivers/platform/x86/think-lmi.c

@@ -195,7 +195,7 @@ static const char * const level_options[] = {
 	[TLMI_LEVEL_MASTER] = "master",
 };
 static struct think_lmi tlmi_priv;
-static struct class *fw_attr_class;
+static const struct class *fw_attr_class;
 static DEFINE_MUTEX(tlmi_mutex);
 
 /* Convert BIOS WMI error string to suitable error code */