Re: [PATCH] usb: typec: qcom-pmic-typec: fix missing fwnode removal in error path

[Dmitry Baryshkov]

On Sat, Oct 19, 2024 at 11:10:51PM +0200, Javier Carrasco wrote:
> If drm_dp_hpd_bridge_register() fails, the probe function returns
> without removing the fwnode via fwnode_remove_software_node(), leaking
> the resource.
> 
> Jump to fwnode_remove if drm_dp_hpd_bridge_register() fails to remove
> the software node acquired with device_get_named_child_node().

I think the fwnode_remove_software_node() is not a proper cleanup
function here (and was most likely c&p from some other driver). See the
comment in front of device_get_named_child_node().

Please add another patch before this one, replacing
fwnode_remove_software_node() with fwnode_handle_put().

> 
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 7d9f1b72b296 ("usb: typec: qcom-pmic-typec: switch to DRM_AUX_HPD_BRIDGE")
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
> ---
>  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> index 2201eeae5a99..776fc7f93f37 100644
> --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> @@ -93,8 +93,10 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  
>  	bridge_dev = devm_drm_dp_hpd_bridge_alloc(tcpm->dev, to_of_node(tcpm->tcpc.fwnode));
> -	if (IS_ERR(bridge_dev))
> -		return PTR_ERR(bridge_dev);
> +	if (IS_ERR(bridge_dev)) {
> +		ret = PTR_ERR(bridge_dev);
> +		goto fwnode_remove;
> +	}
>  
>  	tcpm->tcpm_port = tcpm_register_port(tcpm->dev, &tcpm->tcpc);
>  	if (IS_ERR(tcpm->tcpm_port)) {
> 
> ---
> base-commit: f2493655d2d3d5c6958ed996b043c821c23ae8d3
> change-id: 20241019-qcom_pmic_typec-fwnode_remove-00dc49054cf7
> 
> Best regards,
> -- 
> Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
> 

-- 
With best wishes
Dmitry