linux-kernel - Re: Using statically allocated memory for platform

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Message-ID: <20091102150525.GB5785@n2100.arm.linux.org.uk>
Date:	Mon, 2 Nov 2009 15:05:25 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	Antonio Ospite <ospite@...denti.unina.it>,
	openezx-devel@...ts.openezx.org,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Mike Rapoport <mike@...pulab.co.il>,
	Daniel Ribeiro <drwyrm@...il.com>
Subject: Re: Using statically allocated memory for platform_data.

On Mon, Nov 02, 2009 at 03:00:11PM +0000, Ben Dooks wrote:
> This looks like something is freeing stuff that it did not allocate in
> the first place, which is IMHO bad. The call platform_device_alloc()
> is setting platform_device_release() as the default release function
> but platform_device_release() releases more than platform_device_alloc()
> actually created.
> 
> My view is that platform_device_alloc()'s default release shouldn't
> be freeing the platform data, and that using platform_device_add_data()
> or platform_device_add_resources() should change either the behvaiour 
> of platform_device_release() or it should change the pointer to a new
> release function.

That doesn't work - how do those other functions (adding) know what data
has also been added by other functions?  That can't work reliably.
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