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net: qualcomm: rmnet: Allow configuration updates to existing devices

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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: 1dc49e9d16 ("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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Subash Abhinov Kasiviswanathan 2020-04-01 15:23:55 -06:00 committed by David S. Miller
parent d61f4d61ff
commit 2abb579238
1 changed files with 20 additions and 13 deletions
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33
drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
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@ -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;
if (mux_id != priv->mux_id) {
struct rmnet_endpoint *ep;
ep = rmnet_get_endpoint(port, priv->mux_id);
if (!ep)
return -ENODEV;
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;
}
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]);
ep->mux_id = mux_id;
priv->mux_id = mux_id;
}
if (data[IFLA_RMNET_FLAGS]) {