linux-kernel - Re: [PATCHv4] usb: typec: Add a sysfs node to manage port type

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Date:   Sat, 27 May 2017 13:34:43 -0700
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Oliver Neukum <oneukum@...e.com>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv4] usb: typec: Add a sysfs node to manage port type

On Fri, May 26, 2017 at 10:43 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Fri, May 26, 2017 at 01:42:57PM -0700, Badhri Jagan Sridharan wrote:
>> User space applications in some cases have the need to enforce a
>> specific port type(DFP/UFP/DRP). This change allows userspace to
>> attempt setting the desired port type. Low level drivers can
>> however reject the request if the specific port type is not supported.
>>
>> Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>
>> ---
>> Changelog since v1:
>> - introduced a new variable port_type in struct typec_port to track
>>   the current port type instead of changing type member in
>>   typec_capability to address Heikki Krogerus comments.
>> - changed the output format and strings that would be displayed as
>>   suggested by Heikki Krogerus.
>>
>> Changelog since v2:
>> - introduced a new mutex lock to protect port_type for addressing
>>   the race conditions identified by Geunter Roeck
>> - added typec_port_types_drp for printing port_type when cap->type
>>   is TYPE_PORT_DRP as suggested by Geunter Roeck
>> - Power role swap and data role swaps would be rejected unless
>>   port port_type == TYPE_PORT_DRP
>> - port_type_store would return immediately if the current port_type
>>   is same as the new port_type as suggested by Geunter Roeck
>>
>> Changelog since v3:
>> - Moved as much as code outside port_type_lock as suggested by
>>   Geunter Roeck
>> - Removed Change-Id line from commit message identified by
>>   Greg Kroah-Hartman
>
> Ok, this is how you write a changelog for a patch, very nice job!

Thanks Greg :)

>
> greg k-h