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

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Message-Id: <1512853110-4893-4-git-send-email-subashab@codeaurora.org>
Date:   Sat,  9 Dec 2017 13:58:27 -0700
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: [PATCH net-next v2 3/6] 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@...eaurora.org>
---
 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