linux-kernel - Re: [PATCH v4 09/18] of: overlay: validate overlay properties #address-cells and #size-cells

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Date:   Thu, 18 Oct 2018 13:13:38 -0500
From:   Rob Herring <robh@...nel.org>
To:     frowand.list@...il.com
Cc:     Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alan Tull <atull@...nel.org>, Moritz Fischer <mdf@...nel.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-fpga@...r.kernel.org
Subject: Re: [PATCH v4 09/18] of: overlay: validate overlay properties
 #address-cells and #size-cells

On Mon, Oct 15, 2018 at 07:37:29PM -0700, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> If overlay properties #address-cells or #size-cells are already in
> the live devicetree for any given node, then the values in the
> overlay must match the values in the live tree.
> 
> If the properties are already in the live tree then there is no
> need to create a changeset entry to add them since they must
> have the same value.  This reduces the memory used by the
> changeset and eliminates a possible memory leak.  This is
> verified by 12 fewer warnings during the devicetree unittest,
> as the possible memory leak warnings about #address-cells and

Still missing the rest...

And what about my other comments too?

> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
> Changes since v3:
>   - for errors of an overlay changing the value of #size-cells or
>     #address-cells, return -EINVAL so that overlay apply will fail
>   - for errors of an overlay changing the value of #size-cells or
>     #address-cells, make the message more direct.
>     Old message:
>       OF: overlay: ERROR: overlay and/or live tree #size-cells invalid in node /soc/base_fpga_region
>     New message:
>       OF: overlay: ERROR: changing value of /soc/base_fpga_region/#size-cells not allowed
> 
>  drivers/of/overlay.c | 42 +++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 39 insertions(+), 3 deletions(-)