drm: Remove the minor master list

It doesn't appear to be used anywhere.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>

drivers/gpu/drm/drm_stub.c

@@ -127,8 +127,6 @@ struct drm_master *drm_master_create(struct drm_minor *minor)
 	INIT_LIST_HEAD(&master->magicfree);
 	master->minor = minor;
 
-	list_add_tail(&master->head, &minor->master_list);
-
 	return master;
 }
 
@@ -146,8 +144,6 @@ static void drm_master_destroy(struct kref *kref)
 	struct drm_device *dev = master->minor->dev;
 	struct drm_map_list *r_list, *list_temp;
 
-	list_del(&master->head);
-
 	if (dev->driver->master_destroy)
 		dev->driver->master_destroy(dev, master);
 
@@ -273,7 +269,6 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
 
 	minor->type = type;
 	minor->dev = dev;
-	INIT_LIST_HEAD(&minor->master_list);
 
 	*drm_minor_get_slot(dev, type) = minor;
 	return 0;

include/drm/drmP.h

@@ -689,7 +689,6 @@ struct drm_master {
 
 	struct kref refcount; /* refcount for this master */
 
-	struct list_head head; /**< each minor contains a list of masters */
 	struct drm_minor *minor; /**< link back to minor we are a master for */
 
 	char *unique;			/**< Unique identifier: e.g., busid */
@@ -1022,7 +1021,6 @@ struct drm_minor {
 	struct mutex debugfs_lock; /* Protects debugfs_list. */
 
 	struct drm_master *master; /* currently active master for this node */
-	struct list_head master_list;
 	struct drm_mode_group mode_group;
 };