ipv6: Remove setsockopt_needs_rtnl().

We no longer need to hold RTNL for IPv6 socket options.

Let's remove setsockopt_needs_rtnl().

Signed-off-by: Kuniyuki Iwashima <[e-mail]>
Reviewed-by: Eric Dumazet <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/ipv6/ipv6_sockglue.c

···
 	return opt;
 }
 
-static bool setsockopt_needs_rtnl(int optname)
-{
-	return false;
-}
-
 static int copy_group_source_from_sockptr(struct group_source_req *greqs,
 		sockptr_t optval, int optlen)
 {
···
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct net *net = sock_net(sk);
-	int val, valbool;
 	int retv = -ENOPROTOOPT;
-	bool needs_rtnl = setsockopt_needs_rtnl(optname);
+	int val, valbool;
 
 	if (sockptr_is_null(optval))
 		val = 0;
···
 		return 0;
 	}
 	}
-	if (needs_rtnl)
-		rtnl_lock();
+
 	sockopt_lock_sock(sk);
 
 	/* Another thread has converted the socket into IPv4 with
···
 
 unlock:
 	sockopt_release_sock(sk);
-	if (needs_rtnl)
-		rtnl_unlock();
 
 	return retv;