pcmcia: cs: make pcmcia_socket_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 pcmcia_socket_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>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

drivers/pcmcia/cs.c

@@ -892,7 +892,7 @@ static const struct dev_pm_ops pcmcia_socket_pm_ops = {
 
 #endif /* CONFIG_PM */
 
-struct class pcmcia_socket_class = {
+const struct class pcmcia_socket_class = {
 	.name = "pcmcia_socket",
 	.dev_uevent = pcmcia_socket_uevent,
 	.dev_release = pcmcia_release_socket,

drivers/pcmcia/cs_internal.h

@@ -113,7 +113,7 @@ struct pcmcia_callback{
 /* cs.c */
 extern struct rw_semaphore pcmcia_socket_list_rwsem;
 extern struct list_head pcmcia_socket_list;
-extern struct class pcmcia_socket_class;
+extern const struct class pcmcia_socket_class;
 
 int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c);
 struct pcmcia_socket *pcmcia_get_socket_by_nr(unsigned int nr);