Re: [PATCH v5 1/3] usb: typec: ucsi: add a common function ucsi_unregister_connectors()

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Fri, Apr 22, 2022 at 11:10:20AM +0800, Linyu Yuan wrote:
> As con->port will be used in error path of ucsi_init(),
> it should be NULL or valid.
> 
> In error path of ucsi_init(), it will unregister all valid ucsi connectors,
> and similar operation also happen in ucsi_unregister(),
> add a common function for two places.
> 
> Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
> ---
> v2: improve ucsi_connector_clean(), check total number of connector.
> v3: rename to ucsi_unregister_connectors(), suggest by maintainer
> v4: merge patch#1 in V3, fix a typo samiliar -> similar in commit description
> v5: no change
> 
>  drivers/usb/typec/ucsi/ucsi.c | 52 ++++++++++++++++++++++++-------------------
>  1 file changed, 29 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index f0c2fa1..af9a2a1 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1100,6 +1100,7 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
>  	con->port = typec_register_port(ucsi->dev, cap);
>  	if (IS_ERR(con->port)) {
>  		ret = PTR_ERR(con->port);
> +		con->port = NULL;

I'm not sure you need to add that line. See below.

>  		goto out;
>  	}
>  
> @@ -1186,6 +1187,32 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
>  	return ret;
>  }
>  
> +static void ucsi_unregister_connectors(struct ucsi *ucsi)
> +{
> +	struct ucsi_connector *con;
> +	int i;
> +
> +	if (!ucsi->connector)
> +		return;
> +
> +	for (i = 0; i < ucsi->cap.num_connectors; i++) {
> +		con = &ucsi->connector[i];
> +		if (!con->port)
> +			break;

                if (IS_ERR_OR_NULL(con->port))
                        break;

> +		cancel_work_sync(&con->work);
> +		ucsi_unregister_partner(con);
> +		ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON);
> +		ucsi_unregister_port_psy(con);
> +		if (con->wq)
> +			destroy_workqueue(con->wq);
> +		typec_unregister_port(con->port);
> +	}
> +
> +	kfree(ucsi->connector);
> +	ucsi->connector = NULL;
> +}
> +
>  /**
>   * ucsi_init - Initialize UCSI interface
>   * @ucsi: UCSI to be initialized
> @@ -1194,7 +1221,6 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
>   */
>  static int ucsi_init(struct ucsi *ucsi)
>  {
> -	struct ucsi_connector *con;
>  	u64 command;
>  	int ret;
>  	int i;
> @@ -1249,15 +1275,7 @@ static int ucsi_init(struct ucsi *ucsi)
>  	return 0;
>  
>  err_unregister:
> -	for (con = ucsi->connector; con->port; con++) {
> -		ucsi_unregister_partner(con);
> -		ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON);
> -		ucsi_unregister_port_psy(con);
> -		if (con->wq)
> -			destroy_workqueue(con->wq);
> -		typec_unregister_port(con->port);
> -		con->port = NULL;
> -	}
> +	ucsi_unregister_connectors(ucsi);
>  
>  err_reset:
>  	memset(&ucsi->cap, 0, sizeof(ucsi->cap));
> @@ -1363,7 +1381,6 @@ EXPORT_SYMBOL_GPL(ucsi_register);
>  void ucsi_unregister(struct ucsi *ucsi)
>  {
>  	u64 cmd = UCSI_SET_NOTIFICATION_ENABLE;
> -	int i;
>  
>  	/* Make sure that we are not in the middle of driver initialization */
>  	cancel_work_sync(&ucsi->work);
> @@ -1371,18 +1388,7 @@ void ucsi_unregister(struct ucsi *ucsi)
>  	/* Disable notifications */
>  	ucsi->ops->async_write(ucsi, UCSI_CONTROL, &cmd, sizeof(cmd));
>  
> -	for (i = 0; i < ucsi->cap.num_connectors; i++) {
> -		cancel_work_sync(&ucsi->connector[i].work);
> -		ucsi_unregister_partner(&ucsi->connector[i]);
> -		ucsi_unregister_altmodes(&ucsi->connector[i],
> -					 UCSI_RECIPIENT_CON);
> -		ucsi_unregister_port_psy(&ucsi->connector[i]);
> -		if (ucsi->connector[i].wq)
> -			destroy_workqueue(ucsi->connector[i].wq);
> -		typec_unregister_port(ucsi->connector[i].port);
> -	}
> -
> -	kfree(ucsi->connector);
> +	ucsi_unregister_connectors(ucsi);
>  }
>  EXPORT_SYMBOL_GPL(ucsi_unregister);

thanks,

-- 
heikki