[Bluetooth]: Call tty_hangup() when DCD is de-asserted

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / bluetooth / rfcomm / tty.c

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 6304590fd36a5f6d132f8a6262d5acdb616c0ebf..67d9dd6b0faca002db1ecc8c8bbbeda8a81ad689 100644 (file)
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -528,9 +528,14 @@ static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
        struct rfcomm_dev *dev = dlc->owner;
        if (!dev)
                return;
-       
+
        BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
 
+       if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV)) {
+               if (dev->tty && !C_CLOCAL(dev->tty))
+                       tty_hangup(dev->tty);
+       }
+
        dev->modem_status = 
                ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
                ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |