[PATCH] genetlink: don't touch module ref count

Increasing the module ref count at registration will block the module from
ever being unloaded. In fact, genetlink should not care about the owner at
all. This patch removes the owner field from the struct registered with
genetlink.

Signed-off-by: Per Liden <[e-mail]>
Signed-off-by: Jamal Hadi Salim <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/genetlink.h

···
 	char			name[GENL_NAMSIZ];
 	unsigned int		version;
 	unsigned int		maxattr;
-	struct module *		owner;
 	struct nlattr **	attrbuf;	/* private */
 	struct list_head	ops_list;	/* private */
 	struct list_head	family_list;	/* private */

net/netlink/genetlink.c

···
 		goto errout_locked;
 	}
 
-	if (!try_module_get(family->owner)) {
-		err = -EBUSY;
-		goto errout_locked;
-	}
-
 	if (family->id == GENL_ID_GENERATE) {
 		u16 newid = genl_generate_id();
 
···
 		INIT_LIST_HEAD(&family->ops_list);
 		genl_unlock();
 
-		module_put(family->owner);
 		kfree(family->attrbuf);
 		genl_ctrl_event(CTRL_CMD_DELFAMILY, family);
 		return 0;
···
 	.name = "nlctrl",
 	.version = 0x1,
 	.maxattr = CTRL_ATTR_MAX,
-	.owner = THIS_MODULE,
 };
 
 static int __init genl_init(void)

net/tipc/netlink.c

···
         .version	= TIPC_GENL_VERSION,
         .hdrsize	= TIPC_GENL_HDRLEN,
         .maxattr	= 0,
-	.owner		= THIS_MODULE,
 };
 
 static struct genl_ops ops = {