linux-kernel - Re: [PATCH v2 1/2] soc: imx: gpcv2: Do not pass static memory as platform data

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Message-ID: <20180315030804.GI26859@dragon>
Date:   Thu, 15 Mar 2018 11:08:06 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Fabio Estevam <fabio.estevam@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Stefan Agner <stefan@...er.ch>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: Re: [PATCH v2 1/2] soc: imx: gpcv2: Do not pass static memory as
 platform data

On Thu, Feb 08, 2018 at 02:47:10PM +0800, Shawn Guo wrote:
> On Mon, Jan 22, 2018 at 07:07:47AM -0800, Andrey Smirnov wrote:
> > Platform device core assumes the ownership of dev.platform_data as
> > well as that it is dynamically allocated and it will try to kfree it
> > as a part of platform_device_release(). Change the code to pass
> > kzalloc'ed chunk of memory instead of a pointer to a static memory to
> > avoid causing a BUG() when calling platform_device_put().
> > 
> > The problem can be reproduced by artificially enabling the error path
> > of platform_device_add() call (around line 357).
> > 
> > Note that this change also allows us to constify imx7_pgc_domains,
> > since we no longer need to be able to modify it.
> > 
> > Cc: Shawn Guo <shawnguo@...nel.org>
> > Cc: Stefan Agner <stefan@...er.ch>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Cc: linux-kernel@...r.kernel.org
> > Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> 
> Applied both, thanks.

I decided to drop these two patches.  Triggered by Fabio's patch on top
of you changes, I just took another look at them, and found that
platform_device_add_data() can help us do the same thing in a nicer way.

Shawn

[1] https://patchwork.kernel.org/patch/10274969/