linux-kernel - Re: [PATCHv11 2/3] usb: USB Type-C connector class

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Date:   Mon, 21 Nov 2016 07:33:45 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Badhri Jagan Sridharan <badhri@...gle.com>,
        Oliver Neukum <oneukum@...e.com>, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCHv11 2/3] usb: USB Type-C connector class

On 11/21/2016 06:23 AM, Heikki Krogerus wrote:
> On Mon, Nov 21, 2016 at 03:11:03PM +0200, Heikki Krogerus wrote:
>> Hi Greg,
>>
>> On Mon, Nov 21, 2016 at 11:35:28AM +0100, Greg KH wrote:
>>>> +static void typec_partner_release(struct device *dev)
>>>> +{
>>>> +	struct typec_port *port = to_typec_port(dev->parent);
>>>> +
>>>> +	typec_unregister_altmodes(dev);
>>>> +	port->partner = NULL;
>>>> +}
>>>
>>> This doesn't feel right, why are you both exporting
>>> typec_unregister_altmodes() and also calling it from release callbacks?
>>> That implies there is two way to clean stuff up, so what is a driver
>>> writer to use?  Please simplify and force it to be one way or the other.
>>
>> OK.
>
> Guenter did you need to also remove the alternate modes in drivers, or
> can we just do it here?
>

It is currently called explicitly on a data role change, when executing
a hard reset, on detach, and during error recovery. Most of those would
also unregister the partner, so I should be able to drop those calls
(or maybe I'll have to - I will see when testing), but I am not sure
how to handle data role changes.

Guenter