linux-kernel - Re: [PATCH] mfd: syscon: Don't free allocated name for regmap

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Message-ID: <20200928091949.GC4637@dell>
Date:   Mon, 28 Sep 2020 10:19:49 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Suman Anna <s-anna@...com>
Cc:     Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Arnd Bergmann <arnd@...db.de>, kernel-team@...roid.com
Subject: Re: [PATCH] mfd: syscon: Don't free allocated name for regmap_config

On Fri, 25 Sep 2020, Suman Anna wrote:

> On 9/24/20 7:39 AM, Lee Jones wrote:
> > On Thu, 03 Sep 2020, Marc Zyngier wrote:
> > 
> >> The name allocated for the regmap_config structure is freed
> >> pretty early, right after the registration of the MMIO region.
> >>
> >> Unfortunately, that doesn't follow the life cycle that debugfs
> >> expects, as it can access the name field long after the free
> >> has occured.
> >>
> >> Move the free on the error path, and keep it forever otherwise.
> >>
> >> Fixes: e15d7f2b81d2 ("mfd: syscon: Use a unique name with regmap_config")
> >> Signed-off-by: Marc Zyngier <maz@...nel.org>
> >> ---
> >>  drivers/mfd/syscon.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Fixed the spelling mistake and applied, thanks.
> > 
> 
> Marc,
> Can you recheck the behavior once on the latest master to see if this patch is
> still needed? I see a new patch within the regmap core that is dealing with the
> delayed debugfs registration name. This follows the similar design logic I
> suggested on your initial submission [1].
> 
> Please see commit 94cc89eb8fa5 ("regmap: debugfs: Fix handling of name string
> for debugfs init delays") in mainline.
> 
> Lee,
> I haven't seen this patch in -next yet, so maybe worthwhile to hold it a little
> longer.

It's already applied.

If the lines become superfluous please submit a subsequent patch.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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