On Tue, Nov 22, 2022 at 07:12:26PM +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
>
> The 'parent' returned by fwnode_get_parent() with refcount incremented.
> it needs be put after using.
>
> Fixes: 6fadd72943b8 ("usb: roles: get usb-role-switch from parent")
> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> ---
> v2 -> v4:
> Remove not needed null pointer check.
>
> v1 -> v2:
> Add description to how is the report generated.
> ---
> drivers/usb/roles/class.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
> index dfaed7eee94f..32e6d19f7011 100644
> --- a/drivers/usb/roles/class.c
> +++ b/drivers/usb/roles/class.c
> @@ -106,10 +106,13 @@ usb_role_switch_is_parent(struct fwnode_handle *fwnode)
> struct fwnode_handle *parent = fwnode_get_parent(fwnode);
> struct device *dev;
>
> - if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
> + if (!fwnode_property_present(parent, "usb-role-switch")) {
> + fwnode_handle_put(parent);
> return NULL;
> + }
>
> dev = class_find_device_by_fwnode(role_class, parent);
> + fwnode_handle_put(parent);
> return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
> }
>
thanks,
--
heikki
