pcmcia: ds: make pcmcia_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the pcmcia_bus_type variable to be a constant structure as well,
placing it into read-only memory which can not be modified at runtime.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ricardo B. Marliere <ricardo@marliere.net>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

drivers/pcmcia/cs_internal.h

@@ -132,7 +132,7 @@ void pcmcia_put_socket(struct pcmcia_socket *skt);
  * Stuff internal to module "pcmcia".
  */
 /* ds.c */
-extern struct bus_type pcmcia_bus_type;
+extern const struct bus_type pcmcia_bus_type;
 
 struct pcmcia_device;
 

drivers/pcmcia/ds.c

@@ -1406,7 +1406,7 @@ static const struct dev_pm_ops pcmcia_bus_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(pcmcia_dev_suspend, pcmcia_dev_resume)
 };
 
-struct bus_type pcmcia_bus_type = {
+const struct bus_type pcmcia_bus_type = {
 	.name = "pcmcia",
 	.uevent = pcmcia_bus_uevent,
 	.match = pcmcia_bus_match,