genetlink: only pass array to genl_register_family_with_ops()

As suggested by David Miller, make genl_register_family_with_ops()
a macro and pass only the array, evaluating ARRAY_SIZE() in the
macro, this is a little safer.

The openvswitch has some indirection, assing ops/n_ops directly in
that code. This might ultimately just assign the pointers in the
family initializations, saving the struct genl_family_and_ops and
code (once mcast groups are handled differently.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/team/team.c

@@ -2699,8 +2699,7 @@ static int team_nl_init(void)
 {
 	int err;
 
-	err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
-					    ARRAY_SIZE(team_nl_ops));
+	err = genl_register_family_with_ops(&team_nl_family, team_nl_ops);
 	if (err)
 		return err;
 

drivers/net/wireless/mac80211_hwsim.c

@@ -2148,8 +2148,7 @@ static int hwsim_init_netlink(void)
 
 	printk(KERN_INFO "mac80211_hwsim: initializing netlink\n");
 
-	rc = genl_register_family_with_ops(&hwsim_genl_family,
-		hwsim_ops, ARRAY_SIZE(hwsim_ops));
+	rc = genl_register_family_with_ops(&hwsim_genl_family, hwsim_ops);
 	if (rc)
 		goto failure;
 

fs/dlm/netlink.c

@@ -74,14 +74,16 @@ static int user_cmd(struct sk_buff *skb, struct genl_info *info)
 	return 0;
 }
 
-static struct genl_ops dlm_nl_ops = {
+static struct genl_ops dlm_nl_ops[] = {
+	{
 		.cmd	= DLM_CMD_HELLO,
 		.doit	= user_cmd,
+	},
 };
 
 int __init dlm_netlink_init(void)
 {
-	return genl_register_family_with_ops(&family, &dlm_nl_ops, 1);
+	return genl_register_family_with_ops(&family, dlm_nl_ops);
 }
 
 void dlm_netlink_exit(void)

include/linux/genl_magic_func.h

@@ -293,8 +293,7 @@ static int CONCAT_(GENL_MAGIC_FAMILY, _genl_multicast_ ## group)(	\
 
 int CONCAT_(GENL_MAGIC_FAMILY, _genl_register)(void)
 {
-	int err = genl_register_family_with_ops(&ZZZ_genl_family,
-		ZZZ_genl_ops, ARRAY_SIZE(ZZZ_genl_ops));
+	int err = genl_register_family_with_ops(&ZZZ_genl_family, ZZZ_genl_ops);
 	if (err)
 		return err;
 #undef GENL_mc_group

include/net/genetlink.h

@@ -152,8 +152,9 @@ static inline int genl_register_family(struct genl_family *family)
  *
  * Return 0 on success or a negative error code.
  */
-static inline int genl_register_family_with_ops(struct genl_family *family,
-	const struct genl_ops *ops, size_t n_ops)
+static inline int _genl_register_family_with_ops(struct genl_family *family,
+						 const struct genl_ops *ops,
+						 size_t n_ops)
 {
 	family->module = THIS_MODULE;
 	family->ops = ops;
@@ -161,6 +162,9 @@ static inline int genl_register_family_with_ops(struct genl_family *family,
 	return __genl_register_family(family);
 }
 
+#define genl_register_family_with_ops(family, ops)	\
+	_genl_register_family_with_ops((family), (ops), ARRAY_SIZE(ops))
+
 int genl_unregister_family(struct genl_family *family);
 int genl_register_mc_group(struct genl_family *family,
 			   struct genl_multicast_group *grp);

kernel/taskstats.c

@@ -703,8 +703,7 @@ static int __init taskstats_init(void)
 {
 	int rc;
 
-	rc = genl_register_family_with_ops(&family, taskstats_ops,
-					   ARRAY_SIZE(taskstats_ops));
+	rc = genl_register_family_with_ops(&family, taskstats_ops);
 	if (rc)
 		return rc;
 

net/core/drop_monitor.c

@@ -365,8 +365,7 @@ static int __init init_net_drop_monitor(void)
 	}
 
 	rc = genl_register_family_with_ops(&net_drop_monitor_family,
-					   dropmon_ops,
-					   ARRAY_SIZE(dropmon_ops));
+					   dropmon_ops);
 	if (rc) {
 		pr_err("Could not create drop monitor netlink family\n");
 		return rc;

net/hsr/hsr_netlink.c

@@ -414,8 +414,7 @@ int __init hsr_netlink_init(void)
 	if (rc)
 		goto fail_rtnl_link_register;
 
-	rc = genl_register_family_with_ops(&hsr_genl_family, hsr_ops,
-					   ARRAY_SIZE(hsr_ops));
+	rc = genl_register_family_with_ops(&hsr_genl_family, hsr_ops);
 	if (rc)
 		goto fail_genl_register_family;
 

net/ieee802154/netlink.c

@@ -129,8 +129,7 @@ int __init ieee802154_nl_init(void)
 {
 	int rc;
 
-	rc = genl_register_family_with_ops(&nl802154_family, ieee8021154_ops,
-					   ARRAY_SIZE(ieee8021154_ops));
+	rc = genl_register_family_with_ops(&nl802154_family, ieee8021154_ops);
 	if (rc)
 		return rc;
 

net/ipv4/tcp_metrics.c

@@ -1082,8 +1082,7 @@ void __init tcp_metrics_init(void)
 	if (ret < 0)
 		goto cleanup;
 	ret = genl_register_family_with_ops(&tcp_metrics_nl_family,
-					    tcp_metrics_nl_ops,
-					    ARRAY_SIZE(tcp_metrics_nl_ops));
+					    tcp_metrics_nl_ops);
 	if (ret < 0)
 		goto cleanup_subsys;
 	return;

net/irda/irnetlink.c

@@ -149,8 +149,7 @@ static const struct genl_ops irda_nl_ops[] = {
 
 int irda_nl_register(void)
 {
-	return genl_register_family_with_ops(&irda_nl_family,
-		irda_nl_ops, ARRAY_SIZE(irda_nl_ops));
+	return genl_register_family_with_ops(&irda_nl_family, irda_nl_ops);
 }
 
 void irda_nl_unregister(void)

net/l2tp/l2tp_netlink.c

@@ -887,13 +887,8 @@ EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
 
 static int l2tp_nl_init(void)
 {
-	int err;
-
 	pr_info("L2TP netlink interface\n");
-	err = genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops,
-					    ARRAY_SIZE(l2tp_nl_ops));
-
-	return err;
+	return genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops);
 }
 
 static void l2tp_nl_cleanup(void)

net/netfilter/ipvs/ip_vs_ctl.c

@@ -3666,7 +3666,7 @@ static const struct genl_ops ip_vs_genl_ops[] __read_mostly = {
 static int __init ip_vs_genl_register(void)
 {
 	return genl_register_family_with_ops(&ip_vs_genl_family,
-		ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
+					     ip_vs_genl_ops);
 }
 
 static void ip_vs_genl_unregister(void)

net/netlabel/netlabel_cipso_v4.c

@@ -783,5 +783,5 @@ static const struct genl_ops netlbl_cipsov4_ops[] = {
 int __init netlbl_cipsov4_genl_init(void)
 {
 	return genl_register_family_with_ops(&netlbl_cipsov4_gnl_family,
-		netlbl_cipsov4_ops, ARRAY_SIZE(netlbl_cipsov4_ops));
+					     netlbl_cipsov4_ops);
 }

net/netlabel/netlabel_mgmt.c

@@ -779,5 +779,5 @@ static const struct genl_ops netlbl_mgmt_genl_ops[] = {
 int __init netlbl_mgmt_genl_init(void)
 {
 	return genl_register_family_with_ops(&netlbl_mgmt_gnl_family,
-		netlbl_mgmt_genl_ops, ARRAY_SIZE(netlbl_mgmt_genl_ops));
+					     netlbl_mgmt_genl_ops);
 }

net/netlabel/netlabel_unlabeled.c

@@ -1397,7 +1397,7 @@ static const struct genl_ops netlbl_unlabel_genl_ops[] = {
 int __init netlbl_unlabel_genl_init(void)
 {
 	return genl_register_family_with_ops(&netlbl_unlabel_gnl_family,
-		netlbl_unlabel_genl_ops, ARRAY_SIZE(netlbl_unlabel_genl_ops));
+					     netlbl_unlabel_genl_ops);
 }
 
 /*

net/netlink/genetlink.c

@@ -906,11 +906,13 @@ static int genl_ctrl_event(int event, void *data)
 	return 0;
 }
 
-static struct genl_ops genl_ctrl_ops = {
+static struct genl_ops genl_ctrl_ops[] = {
+	{
 		.cmd		= CTRL_CMD_GETFAMILY,
 		.doit		= ctrl_getfamily,
 		.dumpit		= ctrl_dumpfamily,
 		.policy		= ctrl_policy,
+	},
 };
 
 static struct genl_multicast_group notify_grp = {
@@ -954,7 +956,7 @@ static int __init genl_init(void)
 	for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
 		INIT_LIST_HEAD(&family_ht[i]);
 
-	err = genl_register_family_with_ops(&genl_ctrl, &genl_ctrl_ops, 1);
+	err = genl_register_family_with_ops(&genl_ctrl, genl_ctrl_ops);
 	if (err < 0)
 		goto problem;
 

net/nfc/netlink.c

@@ -1536,8 +1536,7 @@ int __init nfc_genl_init(void)
 {
 	int rc;
 
-	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
-					   ARRAY_SIZE(nfc_genl_ops));
+	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops);
 	if (rc)
 		return rc;
 

net/openvswitch/datapath.c

@@ -1817,8 +1817,9 @@ static int dp_register_genl(void)
 	for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
 		const struct genl_family_and_ops *f = &dp_genl_families[i];
 
-		err = genl_register_family_with_ops(f->family, f->ops,
-						    f->n_ops);
+		f->family->ops = f->ops;
+		f->family->n_ops = f->n_ops;
+		err = genl_register_family(f->family);
 		if (err)
 			goto error;
 		n_registered++;

net/tipc/netlink.c

@@ -76,9 +76,11 @@ static struct genl_family tipc_genl_family = {
 	.maxattr	= 0,
 };
 
-static struct genl_ops tipc_genl_ops = {
+static struct genl_ops tipc_genl_ops[] = {
+	{
 		.cmd		= TIPC_GENL_CMD,
 		.doit		= handle_cmd,
+	},
 };
 
 static int tipc_genl_family_registered;
@@ -87,8 +89,7 @@ int tipc_netlink_start(void)
 {
 	int res;
 
-	res = genl_register_family_with_ops(&tipc_genl_family,
-		&tipc_genl_ops, 1);
+	res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops);
 	if (res) {
 		pr_err("Failed to register netlink interface\n");
 		return res;

net/wimax/stack.c

@@ -597,8 +597,8 @@ int __init wimax_subsys_init(void)
 
 	snprintf(wimax_gnl_family.name, sizeof(wimax_gnl_family.name),
 		 "WiMAX");
-	result = genl_register_family_with_ops(&wimax_gnl_family, wimax_gnl_ops,
-					       ARRAY_SIZE(wimax_gnl_ops));
+	result = genl_register_family_with_ops(&wimax_gnl_family,
+					       wimax_gnl_ops);
 	if (unlikely(result < 0)) {
 		printk(KERN_ERR "cannot register generic netlink family: %d\n",
 		       result);

net/wireless/nl80211.c

@@ -11329,8 +11329,7 @@ int nl80211_init(void)
 {
 	int err;
 
-	err = genl_register_family_with_ops(&nl80211_fam,
-		nl80211_ops, ARRAY_SIZE(nl80211_ops));
+	err = genl_register_family_with_ops(&nl80211_fam, nl80211_ops);
 	if (err)
 		return err;