linux-kernel - Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

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Message-ID: <CAMuHMdWrhgvLv6syjFxfN42ah7pkO9Ye9SJYDTCwRMQCFrJAeg@mail.gmail.com>
Date:   Mon, 29 Jan 2018 15:08:24 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Frank Rowand <frowand.list@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Pantelis Antoniou <panto@...oniou-consulting.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] of: change overlay apply input data from EDT to FDT

Hi Frank,

On Mon, Jan 29, 2018 at 3:53 AM,  <frowand.list@...il.com> wrote:
> From: Frank Rowand <frank.rowand@...y.com>
>
> Move duplicating and unflattening of an overlay flattened devicetree
> (FDT) into the overlay application code.  To accomplish this,
> of_overlay_apply() is replaced by of_overlay_fdt_apply().
>
> The copy of the FDT (aka "duplicate FDT") now belongs to devicetree
> code, which is thus responsible for freeing the duplicate FDT.  The
> caller of of_overlay_fdt_apply() remains responsible for freeing the
> original FDT.
>
> The unflattened device tree (aka expanded device tree, EDT) now
> belongs to devicetree code, which is thus responsible for freeing
> the EDT.
>
> These ownership changes prevent early freeing of the duplicated FDT
> or the EDT, which could result in use after free errors.
>
> These changes led to migrating some unittest overlay data into
> their own devicetree source files, and then converting most of
> them to use sugar syntax instead of hand coding fragments.

Thanks for your series!

> Frank Rowand (2):
>   of: change overlay apply input data from EDT to FDT
>   of: convert unittest overlay devicetree source to sugar syntax

Do you plan to update Documentation/devicetree/overlay-notes.txt
and Documentation/devicetree/bindings/fpga/fpga-region.txt, too?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds