linux-kernel - Re: [PATCH] USB: serial: cp210x: Implement GPIO support for CP2102N

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Date:   Mon, 02 Jul 2018 20:04:32 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     Johan Hovold <johan@...nel.org>
Cc:     Karoly Pados <pados@...os.hu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martyn Welch <martyn.welch@...labora.co.uk>
Subject: Re: [PATCH] USB: serial: cp210x: Implement GPIO support for CP2102N

Johan Hovold <johan@...nel.org> writes:

>> Not quite. It is not from a forum post, but from a SiLabs Knowledge
>> Base article
>> (https://www.silabs.com/community/interface/knowledge-base.entry.html/2017/06/12/fletcher_checksumfo-TeDF)
>
> Yeah, that's the one I was referring to.
>
>> That article states explicitly that the code was taken from Wikipedia,
>> so it is CC-SA, which is to the best of my knowledge 1) compatible
>> with GPL, and 2) does not require attribution if the original material
>> is missing it, and it does. So AFAICT we are clear on the licensing
>> front.
>
> First of all I can't seem to find that code snippet on the wiki page it
> does refer to, so I'm still not convinced.

It was there in older versions of the article.  See for example:
https://en.wikipedia.org/w/index.php?title=Fletcher%27s_checksum&oldid=730327006

> Second, this should have been high-lighted in your submission somehow.

Definitely. All code has an original author who deserves credit.  And if
you cannot find the original author, then there is always a risk than
someone along the line stole the code...  Maybe long before it ended up
in Wikipedia.  But that doesn't matter.

Doesn't seem worth the risk for a simple checksum algorithm which
probably has lots of GPL implementations.

Bjørn