linux-kernel - Re: [PATCH] USB: Add quirk for WORLDE easykey.25 MIDI keyboard

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Message-ID: <CAGUtLj_si26-vBmknrQ+WiX1sKhVi0-Lj4MDu5WiTtUSv72TOw@mail.gmail.com>
Date:   Mon, 23 Jan 2017 19:36:44 +0100
From:   Lukáš Lalinský <lukas@...gene.sk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH] USB: Add quirk for WORLDE easykey.25 MIDI keyboard

On Sat, Jan 21, 2017 at 10:08 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> Always use scripts/get_maintainer.pl to determine who to send patches
> to, and what mailing list.  You forgot linux-usb@...r, which I've now
> added...

I'm sorry about that. I actually did use scripts/get_maintainer.pl,
but it only returned your email address and I added linux-kernel@...r
myself. I guess I ran it with wrong options.

> That's odd, how does other operating systems handle this device?

I'm not sure how realistic this test is, but I ran a Wireshark capture
from Windows 8.1 VM and it seems that for this particular device,
Windows doesn't try to set the current configuration (since there is
only one) and it does not even attempt to get the configuration string
descriptor. I'm not sure if Windows does this in general, but it seems
to work around the problem for this device by not caring about the
configuration string descriptor in the first place.

I have uploaded both captures here -
https://gist.github.com/lalinsky/83148a827d5cd43e79e377d8e1b5ed0d

Lukas