ata: pata_parport: make pata_parport_bus_type const

Now that the driver core can properly handle constant struct bus_type,
move the pata_parport_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 <[email protected]>
Suggested-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: "Ricardo B. Marliere" <[email protected]>
Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Niklas Cassel <[email protected]>

Author: rbmarliere

drivers/ata/pata_parport/pata_parport.c

@@ -464,7 +464,7 @@ static void pata_parport_bus_release(struct device *dev)
 	/* nothing to do here but required to avoid warning on device removal */
 }
 
-static struct bus_type pata_parport_bus_type = {
+static const struct bus_type pata_parport_bus_type = {
 	.name = DRV_NAME,
 };