net: qualcomm: rmnet: Allow only one rmnet dev per muxid per real dev

Upon de-multiplexing data from one real dev, the packets can be sent
to an unique rmnet device for a given mux id.

Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
index 9caa5e387450933ebb1c963da14dd5042b45f2f7..5bb29f44d114a53adca1b6b04084560e7928d6b0 100644 (file)
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
@@ -185,6 +185,9 @@ int rmnet_vnd_newlink(u8 id, struct net_device *rmnet_dev,
        if (ep->egress_dev)
                return -EINVAL;
 
+       if (rmnet_get_endpoint(port, id))
+               return -EBUSY;
+
        rc = register_netdevice(rmnet_dev);
        if (!rc) {
                ep->egress_dev = rmnet_dev;