[Bluetooth] Store remote modem status for RFCOMM TTY

When switching a RFCOMM socket to a TTY, the remote modem status might
be needed later. Currently it is lost since the original configuration
is done via the socket interface. So store the modem status and reply
it when the socket has been converted to a TTY.

Signed-off-by: Denis Kenzior <denis.kenzior@trolltech.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

3 files changed, 8 insertions, 0 deletions

diff --git a/include/net/bluetooth/rfcomm.h b/include/net/bluetooth/rfcomm.h
index 8c54ff37ad4f..4dc8d92a4638 100644
--- a/include/net/bluetooth/rfcomm.h
+++ b/include/net/bluetooth/rfcomm.h
@@ -180,6 +180,7 @@ struct rfcomm_dlc {
         u8            addr;
         u8            priority;
         u8            v24_sig;
+        u8            remote_v24_sig;
         u8            mscex;
         u8            out;
 
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index e56bcfc35a49..fcd2cafe70c8 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -1463,8 +1463,12 @@ static int rfcomm_recv_msc(struct rfcomm_session *s, int cr, struct sk_buff *skb
                         clear_bit(RFCOMM_TX_THROTTLED, &d->flags);
 
                 rfcomm_dlc_lock(d);
+
+                d->remote_v24_sig = msc->v24_sig;
+
                 if (d->modem_status)
                         d->modem_status(d, msc->v24_sig);
+
                 rfcomm_dlc_unlock(d);
 
                 rfcomm_send_msc(s, 0, dlci, msc->v24_sig);
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 248802796e12..8fcca08cef8e 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -271,6 +271,9 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
 
         dlc->owner = dev;
         dev->dlc   = dlc;
+
+        rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
+
         rfcomm_dlc_unlock(dlc);
 
         /* It's safe to call __module_get() here because socket already