linux-kernel - Re: platform_device_add

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Message-ID: <20091026164807.GC28072@suse.de>
Date:	Mon, 26 Oct 2009 09:48:07 -0700
From:	Greg KH <gregkh@...e.de>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Russell King <rmk+kernel@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: platform_device_add_data(pdev, NULL, 0)

On Fri, Oct 23, 2009 at 10:26:22PM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> mfd_add_device() (defined in drivers/mfd/mfd-core.c) is a wrapper do
> allocate platform_devices.
> 
> It contains:
> 
> 	ret = platform_device_add_data(pdev,
> 			cell->platform_data, cell->data_size);
> 
> If cell->data_size is 0 (and so likely cell->platform_data == NULL),
> still pdev->dev.platform_data get assigned ZERO_SIZE_PTR.
> 
> IMHO the result should better be that pdev->dev.platform_data ends being
> NULL, too.  Agreed?

Why?  Is this causing problems somewhere?

thanks,

greg k-h
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