On Tue, Oct 08, 2019 at 02:13:42PM +0300, Heikki Krogerus wrote:
> Copying everything from struct typec_capability to struct
> typec_port during port registration. This will make sure
> that under no circumstances the driver can change the values
> in the struct typec_capability that the port uses.
>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> drivers/usb/typec/class.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 94a3eda62add..0bbf10c8ad58 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -52,6 +52,7 @@ struct typec_port {
> struct typec_switch *sw;
> struct typec_mux *mux;
>
> + const struct typec_capability *orig_cap; /* to be removed */
> const struct typec_capability *cap;
> };
>
> @@ -968,7 +969,7 @@ preferred_role_store(struct device *dev, struct device_attribute *attr,
> return -EINVAL;
> }
>
> - ret = port->cap->try_role(port->cap, role);
> + ret = port->cap->try_role(port->orig_cap, role);
> if (ret)
> return ret;
>
> @@ -1014,7 +1015,7 @@ static ssize_t data_role_store(struct device *dev,
> goto unlock_and_ret;
> }
>
> - ret = port->cap->dr_set(port->cap, ret);
> + ret = port->cap->dr_set(port->orig_cap, ret);
> if (ret)
> goto unlock_and_ret;
>
> @@ -1071,7 +1072,7 @@ static ssize_t power_role_store(struct device *dev,
> goto unlock_and_ret;
> }
>
> - ret = port->cap->pr_set(port->cap, ret);
> + ret = port->cap->pr_set(port->orig_cap, ret);
> if (ret)
> goto unlock_and_ret;
>
> @@ -1119,7 +1120,7 @@ port_type_store(struct device *dev, struct device_attribute *attr,
> goto unlock_and_ret;
> }
>
> - ret = port->cap->port_type_set(port->cap, type);
> + ret = port->cap->port_type_set(port->orig_cap, type);
> if (ret)
> goto unlock_and_ret;
>
> @@ -1184,7 +1185,7 @@ static ssize_t vconn_source_store(struct device *dev,
> if (ret)
> return ret;
>
> - ret = port->cap->vconn_set(port->cap, (enum typec_role)source);
> + ret = port->cap->vconn_set(port->orig_cap, (enum typec_role)source);
> if (ret)
> return ret;
>
> @@ -1278,6 +1279,7 @@ static void typec_release(struct device *dev)
> ida_destroy(&port->mode_ids);
> typec_switch_put(port->sw);
> typec_mux_put(port->mux);
> + kfree(port->cap);
> kfree(port);
> }
>
> @@ -1579,9 +1581,10 @@ struct typec_port *typec_register_port(struct device *parent,
> mutex_init(&port->port_type_lock);
>
> port->id = id;
> - port->cap = cap;
> + port->orig_cap = cap;
> port->port_type = cap->type;
> port->prefer_role = cap->prefer_role;
> + port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
I just realized ... unfortunately kmemdup() can return NULL.
>
> device_initialize(&port->dev);
> port->dev.class = typec_class;
> --
> 2.23.0
>
