@@ -282,7 +282,6 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
{
struct rmnet_priv *priv = netdev_priv(dev);
struct net_device *real_dev;
- struct rmnet_endpoint *ep;
struct rmnet_port *port;
u16 mux_id;
@@ -297,19 +296,27 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
if (data[IFLA_RMNET_MUX_ID]) {
mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
- if (rmnet_get_endpoint(port, mux_id)) {
- NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
- return -EINVAL;
- }
- ep = rmnet_get_endpoint(port, priv->mux_id);
- if (!ep)
- return -ENODEV;
- hlist_del_init_rcu(&ep->hlnode);
- hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]);
+ if (mux_id != priv->mux_id) {
+ struct rmnet_endpoint *ep;
+
+ ep = rmnet_get_endpoint(port, priv->mux_id);
+ if (!ep)
+ return -ENODEV;
- ep->mux_id = mux_id;
- priv->mux_id = mux_id;
+ if (rmnet_get_endpoint(port, mux_id)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "MUX ID already exists");
+ return -EINVAL;
+ }
+
+ hlist_del_init_rcu(&ep->hlnode);
+ hlist_add_head_rcu(&ep->hlnode,
+ &port->muxed_ep[mux_id]);
+
+ ep->mux_id = mux_id;
+ priv->mux_id = mux_id;
+ }
}
if (data[IFLA_RMNET_FLAGS]) {
This allows the changelink operation to succeed if the mux_id was specified as an argument. Note that the mux_id must match the existing mux_id of the rmnet device or should be an unused mux_id. Fixes: 1dc49e9d164c ("net: rmnet: do not allow to change mux id if mux id is duplicated") Reported-and-tested-by: Alex Elder <elder@linaro.org> Signed-off-by: Sean Tranchetti <stranche@codeaurora.org> Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> --- v1->v2: Get the endpoint within the mux check as mentioned by Alex. --- .../ethernet/qualcomm/rmnet/rmnet_config.c | 31 ++++++++++++------- 1 file changed, 19 insertions(+), 12 deletions(-)