linux-kernel - Re: [PATCH 1/3] backlight: as3711

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Message-ID: <20171114180514.GA11226@localhost>
Date:   Tue, 14 Nov 2017 19:05:14 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>, Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        Guennadi Liakhovetski <g.liakhovetski@....de>
Subject: Re: [PATCH 1/3] backlight: as3711_bl: fix device-tree node lookup

On Mon, Nov 13, 2017 at 02:16:09PM +0000, Daniel Thompson wrote:
> On 13/11/17 10:20, Johan Hovold wrote:
> > Fix child-node lookup during probe, which ended up searching the whole
> > device tree depth-first starting at the parent rather than just matching
> > on its children.
> > 
> > To make things worse, the parent mfd node was also prematurely freed.
> > 
> > Note that the nodes returned from the two calls to of_parse_phandle()
> > are also leaking, but fixing that is a bit more involved as pointers to
> > node fields are being stored for later use.
> 
> Is using a devm_kstrdup() to remember the full_name sufficient so get 
> each of the FIXMEs cleaned up as well?

Yeah, that may be sufficient, but looking closer at this now, it seems
the name pointers (su1_fb and su2_fb) are only used as booleans, and the
fb_name pointer in struct as3711_bl_data is never used at all.

So cleaning that up somehow (e.g. and maybe even dropping non-dt
probing) would also work.

But since this is a separate, and less critical issue, I think it needs
to be done as a follow up to this one.

Thanks,
Johan