On Mon, Nov 21, 2022 at 02:24:16PM +0800, Yang Yingliang wrote:
> I got the following report while doing device(mt6370-tcpc) load
> test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:
>
> OF: ERROR: memory leak, expected refcount 1 instead of 2,
> of_node_get()/of_node_put() unbalanced - destroy cset entry:
> attach overlay node /i2c/pmic@34/tcpc/connector
>
> The 'fwnode' set in tcpci_parse_config() which is called
> in tcpci_register_port(), its node refcount is increased
> in device_get_named_child_node(). It needs be put while
> exiting, so call fwnode_handle_put() in the error path of
> tcpci_register_port() and in tcpci_unregister_port() to
> avoid leak.
>
> Fixes: 5e85a04c8c0d ("usb: typec: add fwnode to tcpc")
> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> v2 -> v3:
> Move fwnode_handle_put() into tcpci_unregister_port().
>
> v1 -> v2:
> Add description to how is the report generated and
> the review tag from Guenter.
> ---
> drivers/usb/typec/tcpm/tcpci.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index b2bfcebe218f..72f8d1e87600 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -794,8 +794,10 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
> return ERR_PTR(err);
>
> tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc);
> - if (IS_ERR(tcpci->port))
> + if (IS_ERR(tcpci->port)) {
> + fwnode_handle_put(tcpci->tcpc.fwnode);
> return ERR_CAST(tcpci->port);
> + }
>
> return tcpci;
> }
> @@ -804,6 +806,7 @@ EXPORT_SYMBOL_GPL(tcpci_register_port);
> void tcpci_unregister_port(struct tcpci *tcpci)
> {
> tcpm_unregister_port(tcpci->port);
> + fwnode_handle_put(tcpci->tcpc.fwnode);
> }
> EXPORT_SYMBOL_GPL(tcpci_unregister_port);
>
> --
> 2.25.1
>
