linux-kernel - Re: [PATCH] sm501: Add uart support

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Date:	Tue, 12 Feb 2008 16:04:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	linux-kernel@...r.kernel.org, ben@...ff.org, magnus.damm@...il.com,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] sm501: Add uart support

On Fri, 08 Feb 2008 18:57:42 +0900
Magnus Damm <magnus.damm@...il.com> wrote:

>  	smdev = kzalloc(sizeof(struct sm501_device) +
> -			sizeof(struct resource) * res_count, GFP_KERNEL);
> +			(sizeof(struct resource) * res_count) +
> +			platform_data_size, GFP_KERNEL);
>
> ...
>
> +		smdev->pdev.resource = (struct resource *)(smdev+1);

So this driver plays party tricks with memory allocation and the C type
system.

We could at least add

	struct resource resources[0];

to the end of `struct sm501_device' to avoid the type abuse.  Or we could
even get radical and splurge four bytes on a `struct resource *'.  But
please, not this.


Oh well. A pre-existing problem.
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