static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
{
struct nlattr **attrbuf = genl_family_attrbuf(&nfc_genl_family);
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])
return ERR_PTR(-EINVAL);
idx = nla_get_u32(attrbuf[NFC_ATTR_DEVICE_INDEX]);
dev = nfc_get_device(idx);
if (!dev)
return ERR_PTR(-ENODEV);
return dev;
}
int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
{
u32 maxattr = tipc_genl_family.maxattr;
*attr = genl_family_attrbuf(&tipc_genl_family);
if (!*attr)
return -EOPNOTSUPP;
return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
NULL);
}
