mISDN: Fix deactivation, if peer IP is removed from l1oip instance.

 Added GETPEER operation.
 Socket now checks if device is already busy at a differen mode.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <kkeil@suse.de>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index 2f6d6e88ff2c..916569ca156d 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -460,6 +460,8 @@ data_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 {
         struct sockaddr_mISDN *maddr = (struct sockaddr_mISDN *) addr;
         struct sock *sk = sock->sk;
+        struct hlist_node *node;
+        struct sock *csk;
         int err = 0;
 
         if (*debug & DEBUG_SOCKET)
@@ -480,6 +482,24 @@ data_sock_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
                 err = -ENODEV;
                 goto done;
         }
+
+        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);
+
         _pms(sk)->ch.send = mISDN_send;
         _pms(sk)->ch.ctrl = mISDN_ctrl;