Bluetooth: Force -EIO from tty read/write if .activate() fails

If rfcomm_dlc_open() fails, set tty into error state which returns
-EIO from reads and writes.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-By: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 375b60dae04d..f6b9f0c4c29e 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -111,8 +111,12 @@ static void rfcomm_dev_destruct(struct tty_port *port)
 static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
 {
         struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
+        int err;
 
-        return rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
+        err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
+        if (err)
+                set_bit(TTY_IO_ERROR, &tty->flags);
+        return err;
 }
 
 /* we block the open until the dlc->state becomes BT_CONNECTED */