linux-kernel - Re: [PATCH 1/2] usb: typec: Add helper to get partner device struct

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Date:   Tue, 22 Nov 2022 11:58:22 +0200
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        chrome-platform@...ts.linux.dev,
        Benson Leung <bleung@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 1/2] usb: typec: Add helper to get partner device struct

Hi Prashant,

On Mon, Nov 21, 2022 at 08:13:35PM +0000, Prashant Malani wrote:
> +/**
> + * typec_partner_to_dev - Get the device struct of a USB Type-C partner.
> + * @partner: USB Type-C Partner
> + *
> + * Returns a pointer to the device struct or NULL.
> + */
> +struct device *typec_partner_to_dev(struct typec_partner *partner)
> +{
> +	return partner ? &partner->dev : NULL;
> +}
> +EXPORT_SYMBOL_GPL(typec_partner_to_dev);

Let's not loose the protection around these devices unless there is no
other way, and in this case there is.

Please just create a wrapper for usb_power_delivery_register() instead:

struct usb_power_delivery *
typec_partner_usb_power_delivery_register(struct typec_partner *partner,
                                          struct usb_power_delivery_desc *desc)
{
        return usb_power_delivery_register(&partner->dev, desc);
}
EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register);

thanks,

-- 
heikki