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

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Message-ID: <20171115143211.azfduwkxmzrhlcsd@dell>
Date:   Wed, 15 Nov 2017 14:32:11 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Daniel Thompson <daniel.thompson@...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 Wed, 15 Nov 2017, Johan Hovold wrote:

> On Tue, Nov 14, 2017 at 07:48:09PM +0000, Daniel Thompson wrote:
> > On 14/11/17 18:05, Johan Hovold wrote:
> > > 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.
> > 
> > To be honest it was adding the separate and less critical FIXMEs into 
> > the patches that attracted my attention in the first place. ;-)
> 
> Heh. Since I was touching those error paths, I at least wanted to record
> somehow there were further issues to be addressed. But feel free to drop
> the FIXMEs if you prefer.

In my experience FIXME's tend not to get addressed:

$ git grep -i fixme | wc -l
4431

Submit patches instead. :)

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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