netlink: reduce NLA_POLICY_NESTED{,_ARRAY} arguments

In typical cases, there's no need to pass both the maxattr
and the policy array pointer, as the maxattr should just be
ARRAY_SIZE(policy) - 1. Therefore, to be less error prone,
just remove the maxattr argument from the default macros
and deduce the size accordingly.

Leave the original macros with a leading underscore to use
here and in case somebody needs to pass a policy pointer
where the policy isn't declared in the same place and thus
ARRAY_SIZE() cannot be used.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/netlink.h

@@ -306,10 +306,14 @@ struct nla_policy {
 #define NLA_POLICY_ETH_ADDR		NLA_POLICY_EXACT_LEN(ETH_ALEN)
 #define NLA_POLICY_ETH_ADDR_COMPAT	NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN)
 
-#define NLA_POLICY_NESTED(maxattr, policy) \
+#define _NLA_POLICY_NESTED(maxattr, policy) \
 	{ .type = NLA_NESTED, .validation_data = policy, .len = maxattr }
-#define NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
+#define _NLA_POLICY_NESTED_ARRAY(maxattr, policy) \
 	{ .type = NLA_NESTED_ARRAY, .validation_data = policy, .len = maxattr }
+#define NLA_POLICY_NESTED(policy) \
+	_NLA_POLICY_NESTED(ARRAY_SIZE(policy) - 1, policy)
+#define NLA_POLICY_NESTED_ARRAY(policy) \
+	_NLA_POLICY_NESTED_ARRAY(ARRAY_SIZE(policy) - 1, policy)
 
 #define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
 #define NLA_ENSURE_INT_TYPE(tp)				\

net/wireless/nl80211.c

@@ -259,15 +259,13 @@ nl80211_pmsr_ftm_req_attr_policy[NL80211_PMSR_FTM_REQ_ATTR_MAX + 1] = {
 static const struct nla_policy
 nl80211_pmsr_req_data_policy[NL80211_PMSR_TYPE_MAX + 1] = {
 	[NL80211_PMSR_TYPE_FTM] =
-		NLA_POLICY_NESTED(NL80211_PMSR_FTM_REQ_ATTR_MAX,
-				  nl80211_pmsr_ftm_req_attr_policy),
+		NLA_POLICY_NESTED(nl80211_pmsr_ftm_req_attr_policy),
 };
 
 static const struct nla_policy
 nl80211_pmsr_req_attr_policy[NL80211_PMSR_REQ_ATTR_MAX + 1] = {
 	[NL80211_PMSR_REQ_ATTR_DATA] =
-		NLA_POLICY_NESTED(NL80211_PMSR_TYPE_MAX,
-				  nl80211_pmsr_req_data_policy),
+		NLA_POLICY_NESTED(nl80211_pmsr_req_data_policy),
 	[NL80211_PMSR_REQ_ATTR_GET_AP_TSF] = { .type = NLA_FLAG },
 };
 
@@ -280,8 +278,7 @@ nl80211_psmr_peer_attr_policy[NL80211_PMSR_PEER_ATTR_MAX + 1] = {
 	 */
 	[NL80211_PMSR_PEER_ATTR_CHAN] = { .type = NLA_NESTED },
 	[NL80211_PMSR_PEER_ATTR_REQ] =
-		NLA_POLICY_NESTED(NL80211_PMSR_REQ_ATTR_MAX,
-				  nl80211_pmsr_req_attr_policy),
+		NLA_POLICY_NESTED(nl80211_pmsr_req_attr_policy),
 	[NL80211_PMSR_PEER_ATTR_RESP] = { .type = NLA_REJECT },
 };
 
@@ -292,8 +289,7 @@ nl80211_pmsr_attr_policy[NL80211_PMSR_ATTR_MAX + 1] = {
 	[NL80211_PMSR_ATTR_RANDOMIZE_MAC_ADDR] = { .type = NLA_REJECT },
 	[NL80211_PMSR_ATTR_TYPE_CAPA] = { .type = NLA_REJECT },
 	[NL80211_PMSR_ATTR_PEERS] =
-		NLA_POLICY_NESTED_ARRAY(NL80211_PMSR_PEER_ATTR_MAX,
-					nl80211_psmr_peer_attr_policy),
+		NLA_POLICY_NESTED_ARRAY(nl80211_psmr_peer_attr_policy),
 };
 
 const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
@@ -555,8 +551,7 @@ const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
 	},
 	[NL80211_ATTR_TIMEOUT] = NLA_POLICY_MIN(NLA_U32, 1),
 	[NL80211_ATTR_PEER_MEASUREMENTS] =
-		NLA_POLICY_NESTED(NL80211_PMSR_ATTR_MAX,
-				  nl80211_pmsr_attr_policy),
+		NLA_POLICY_NESTED(nl80211_pmsr_attr_policy),
 	[NL80211_ATTR_AIRTIME_WEIGHT] = NLA_POLICY_MIN(NLA_U16, 1),
 };