linux-kernel - Re: [PATCH 1/3] driver core/platform: don't leak memory allocated for dma

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Message-ID: <20140526165105.GD3693@n2100.arm.linux.org.uk>
Date:	Mon, 26 May 2014 17:51:05 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Emil Goode <emilgoode@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Yann Droneaud <ydroneaud@...eya.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Olof Johansson <olof@...om.net>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/3] driver core/platform: don't leak memory allocated
	for dma_mask

On Mon, May 26, 2014 at 06:41:21PM +0200, Emil Goode wrote:
> @@ -211,6 +215,7 @@ struct platform_device *platform_device_alloc(const char *name, int id)
>  		strcpy(pa->name, name);
>  		pa->pdev.name = pa->name;
>  		pa->pdev.id = id;
> +		pa->pdev.dev.dma_mask = &pa->dma_mask;

There is code in the kernel which, rightly or wrongly, checks whether
dev->dma_mask is NULL to determine whether the device can do any kind
of DMA.  The above results in devices allocated via this interface
always having this member set, which is a change of core kernel behaviour.

How sure are you that this will not break anything?

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