linux-kernel - Re: [PATCH 1/5] usb: gadget: f

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Date:	Fri, 4 Mar 2016 09:07:40 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Felipe Ferreri Tonello <eu@...ipetonello.com>,
	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
	Michal Nazarewicz <mina86@...a86.com>
Subject: Re: [PATCH 1/5] usb: gadget: f_midi: refactor state machine

Felipe Ferreri Tonello wrote:
> On 03/03/16 11:38, Clemens Ladisch wrote:
>> But in what way was the old state machine not "proper"?
>
> Because it didn't reflect all the correct and possible MIDI states

The whole point of the one-byte real-time messages is that they do not
affect the parsing of the surrounding MIDI stream.  So not making them
part of the state machine is the proper way of handling them.  (Also
see the flowchart in appendix A of the spec.)

> This patch doesn't change any functionality. But the important thing
> here is that it improves the driver maintainability [...]

Then I won't get in the way of this driver's maintainer.

Regards,
Clemens