genetlink: add function genl_has_listeners()

[firefly-linux-kernel-4.4.55.git] / include / net / genetlink.h

diff --git a/include/net/genetlink.h b/include/net/genetlink.h
index 93695f0e22a54a7e4fa16f6934b1e085e75e1a7b..af10c2cf8a1dce00d9cc5414f67d5917bf911570 100644 (file)
--- a/include/net/genetlink.h
+++ b/include/net/genetlink.h
@@ -394,4 +394,12 @@ static inline int genl_set_err(struct genl_family *family, struct net *net,
        return netlink_set_err(net->genl_sock, portid, group, code);
 }
 
+static inline int genl_has_listeners(struct genl_family *family,
+                                    struct sock *sk, unsigned int group)
+{
+       if (WARN_ON_ONCE(group >= family->n_mcgrps))
+               return -EINVAL;
+       group = family->mcgrp_offset + group;
+       return netlink_has_listeners(sk, group);
+}
 #endif /* __NET_GENERIC_NETLINK_H */