linux-kernel - Re: [PATCH] mtd: parser: cmdline: Support MTD names containing one or more colons

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Date:   Fri, 27 Nov 2020 10:54:30 -0800
From:   ron minnich <rminnich@...il.com>
To:     Sven Eckelmann <sven@...fation.org>
Cc:     linux-mtd@...ts.infradead.org, John Audia <graysky@...hlinux.us>,
        Adrian Schmutzler <freifunk@...ianschmutzler.de>,
        jstefek@...to.com, Richard Weinberger <richard@....at>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Ron Minnich <rminnich@...gle.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH] mtd: parser: cmdline: Support MTD names containing one or
 more colons

Thanks, Sven, for your patience, I will indeed try to test this next week.

On Fri, Nov 27, 2020 at 9:35 AM Sven Eckelmann <sven@...fation.org> wrote:
>
> On Friday, 27 November 2020 18:16:54 CET ron minnich wrote:
> > What none of the people involved in the original patch knew was that
> > there would be other ':' in use. Sorry!
> >
> > But you are right, my idea is a complete non-starter, don't know what
> > I was thinking.
>
> I am still not sure because I still didn't get what you actually wanted to
> change. I first thought that you wanted to change
>
>     mtdparts=spi0.0:256k(0:SBL1)
>
> to
>
>     mtdparts=spi0.0!256k(0:SBL1)
>
> which wouldn't work for me when ":" is not supported anymore. And it would
> break a lot of already working installations.
>
> But maybe I completely misread it. Maybe you wanted to introduce an
> optional(!!!) stop marker like !
>
>     mtdparts=spi0.0!:256k(0:SBL1)
>
> to inform the parser that it doesn't have to search for : before the !. While
> this could work for me, I am not qualified enough to say which character is
> not yet used and can be utilized.
>
> But the note about [ and ] at least makes sense to me (if it is optional):
>
>     mtdparts=[spi0.0]:256k(0:SBL1)
>
> But I am not sure if this will be a problem for people which already adopted
> PCI IDs inside the mtdparts without [ and ].
>
> > So it seems your patch, if it works, is the way to go?
>
> At least this is a workaround [1] which can be pushed to all the stable
> kernels which broke with the "Support MTD names containing one or more colons"
> patch. And the one which OpenWrt adopted now to get the devices booting again.
> It is only waiting for a Tested-by from you.
>
> > I can't think
> > of anything better that lets us preserve current behavior and support
> > PCI device specifiers?
>
> I am not that deep in this topic. So I am not sure what else could be done.
>
> Kind regards,
>         Sven
>
> [1] https://patchwork.ozlabs.org/project/linux-mtd/patch/20201124062506.185392-1-sven@narfation.org/