+
+ if (sk->sk_protocol < ISDN_P_B_START) {
+ read_lock_bh(&data_sockets.lock);
+ sk_for_each(csk, node, &data_sockets.head) {
+ if (sk == csk)
+ continue;
+ if (_pms(csk)->dev != _pms(sk)->dev)
+ continue;
+ if (csk->sk_protocol >= ISDN_P_B_START)
+ continue;
+ if (IS_ISDN_P_TE(csk->sk_protocol)
+ == IS_ISDN_P_TE(sk->sk_protocol))
+ continue;
+ read_unlock_bh(&data_sockets.lock);
+ err = -EBUSY;
+ goto done;
+ }
+ read_unlock_bh(&data_sockets.lock);
+ }
+