Subject: [PATCH net-next v2 3/6] net: qualcomm: rmnet: Allow only one rmnet dev per muxid per real dev

From: Subash Abhinov Kasiviswanathan <[email-masked]>
Date: Sat, 9 Dec 2017 13:58:27 -0700

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 <[email-masked]>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_vnd.c
index 9caa5e3..5bb29f4 100644
--- 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;
-- 
1.9.1