linux-kernel - Re: [PATCH v1] usb: typec: Return size of buffer if pd

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Message-ID: <Zf1Tvk0SeE9oxXiA@kuha.fi.intel.com>
Date: Fri, 22 Mar 2024 11:47:42 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Kyle Tso <kyletso@...gle.com>
Cc: linux@...ck-us.net, gregkh@...uxfoundation.org, badhri@...gle.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH v1] usb: typec: Return size of buffer if pd_set operation
 succeeds

On Tue, Mar 19, 2024 at 03:43:09PM +0800, Kyle Tso wrote:
> The attribute writing should return the number of bytes used from the
> buffer on success.
> 
> Fixes: a7cff92f0635 ("usb: typec: USB Power Delivery helpers for ports and partners")
> Cc: stable@...r.kernel.org
> Signed-off-by: Kyle Tso <kyletso@...gle.com>

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

> ---
>  drivers/usb/typec/class.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 389c7f0b8d93..9610e647a8d4 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -1310,6 +1310,7 @@ static ssize_t select_usb_power_delivery_store(struct device *dev,
>  {
>  	struct typec_port *port = to_typec_port(dev);
>  	struct usb_power_delivery *pd;
> +	int ret;
>  
>  	if (!port->ops || !port->ops->pd_set)
>  		return -EOPNOTSUPP;
> @@ -1318,7 +1319,11 @@ static ssize_t select_usb_power_delivery_store(struct device *dev,
>  	if (!pd)
>  		return -EINVAL;
>  
> -	return port->ops->pd_set(port, pd);
> +	ret = port->ops->pd_set(port, pd);
> +	if (ret)
> +		return ret;
> +
> +	return size;
>  }
>  
>  static ssize_t select_usb_power_delivery_show(struct device *dev,
> -- 
> 2.44.0.291.gc1ea87d7ee-goog

-- 
heikki