net: nfc: have genetlink code to parse the attrs during dumpit

Benefit from the fact that the generic netlink code can parse the attrs
for dumpit op and avoid need to parse it in the op callback.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/nfc/netlink.c

@@ -102,22 +102,14 @@ nla_put_failure:
 
 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 {
-	struct nlattr **attrbuf = genl_family_attrbuf(&nfc_genl_family);
+	const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 	struct nfc_dev *dev;
-	int rc;
 	u32 idx;
 
-	rc = nlmsg_parse_deprecated(cb->nlh,
-				    GENL_HDRLEN + nfc_genl_family.hdrsize,
-				    attrbuf, nfc_genl_family.maxattr,
-				    nfc_genl_policy, NULL);
-	if (rc < 0)
-		return ERR_PTR(rc);
-
-	if (!attrbuf[NFC_ATTR_DEVICE_INDEX])
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 		return ERR_PTR(-EINVAL);
 
-	idx = nla_get_u32(attrbuf[NFC_ATTR_DEVICE_INDEX]);
+	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
 	dev = nfc_get_device(idx);
 	if (!dev)
@@ -1697,7 +1689,8 @@ static const struct genl_ops nfc_genl_ops[] = {
 	},
 	{
 		.cmd = NFC_CMD_GET_TARGET,
-		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
+		.validate = GENL_DONT_VALIDATE_STRICT |
+			    GENL_DONT_VALIDATE_DUMP_STRICT,
 		.dumpit = nfc_genl_dump_targets,
 		.done = nfc_genl_dump_targets_done,
 	},