Re: [PATCH v2] usb: typec: ucsi: gaokun: unwind notifier on UCSI register failure

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

On Mon, Jun 22, 2026 at 11:32:30PM +0800, Pengpeng Hou wrote:
> gaokun_ucsi_register_worker() registers the EC notifier before calling
> ucsi_register().  If ucsi_register() fails, the worker currently only logs
> the error and leaves the notifier registered.  Later EC events can then
> call into an unpublished UCSI instance.  The remove path also
> unconditionally unregisters the notifier and UCSI device even if the
> delayed worker failed before both were published.
> 
> Unregister the notifier immediately when ucsi_register() fails, and track
> only the fully published state.  The remove path then tears down the pair
> only if both publication steps completed.
> 
> Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> Changes since v1:
> - Drop the two-flag bookkeeping objected to by Greg Kroah-Hartman.
> - Keep the existing registration order, but use a single flag that is set
>   only after both the notifier and UCSI device are published.
> - Unregister the EC notifier immediately if ucsi_register() fails.
> - Compile-tested only; no Gaokun hardware was available.
> 
>  drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c b/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
> index ca749fde49bd..0dcbbff5f205 100644
> --- a/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
> +++ b/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
> @@ -98,6 +98,7 @@ struct gaokun_ucsi {
>  	struct device *dev;
>  	struct delayed_work work;
>  	struct notifier_block nb;
> +	bool registered;
>  	u16 version;
>  	u8 num_ports;
>  };
> @@ -457,8 +458,12 @@ static void gaokun_ucsi_register_worker(struct work_struct *work)
>  	}
>  
>  	ret = ucsi_register(ucsi);
> -	if (ret)
> +	if (ret) {
>  		dev_err_probe(ucsi->dev, ret, "ucsi register failed\n");
> +		gaokun_ec_unregister_notify(uec->ec, &uec->nb);
> +		return;
> +	}
> +	uec->registered = true;
>  }
>  
>  static int gaokun_ucsi_probe(struct auxiliary_device *adev,
> @@ -504,8 +509,10 @@ static void gaokun_ucsi_remove(struct auxiliary_device *adev)
>  	struct gaokun_ucsi *uec = auxiliary_get_drvdata(adev);
>  
>  	disable_delayed_work_sync(&uec->work);
> -	gaokun_ec_unregister_notify(uec->ec, &uec->nb);
> -	ucsi_unregister(uec->ucsi);
> +	if (uec->registered) {
> +		gaokun_ec_unregister_notify(uec->ec, &uec->nb);
> +		ucsi_unregister(uec->ucsi);
> +	}
>  	ucsi_destroy(uec->ucsi);
>  }
>  
> -- 
> 2.50.1

-- 
heikki