linux-kernel - Re: [PATCH] UIO: Implement a UIO interface for the SMX Cryptengine

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Date:	Wed, 12 Mar 2008 19:08:31 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Ben Nizette <bn@...sdigital.com>
Cc:	gregkh@...e.de, linux-kernel <linux-kernel@...r.kernel.org>,
	hjk@...utronix.de
Subject: Re: [PATCH] UIO: Implement a UIO interface for the SMX Cryptengine

On Tue, Mar 11, 2008 at 03:57:10PM +1100, Ben Nizette wrote:
> +	regs = platform_get_resource(dev, IORESOURCE_MEM, 0);
> +	if (!regs)
> +		goto out_free;
> +
> +	info->mem[0].addr = regs->start;
> +	if (!info->mem[0].addr)
> +		goto out_free;
> +	info->mem[0].internal_addr = ioremap(regs->start, regs->end -
> regs->start);
> +	if (!info->mem[0].internal_addr)
> +		goto out_free;
> +
> +	info->mem[0].size = regs->end - regs->start;
> +	info->mem[0].memtype = UIO_MEM_PHYS;
> +
You have an off-by-1 in the resource size. ioremap and struct resource
are not equal in their expectations. You probably want to do something
like:

	info->mem[0].size = regs->end - regs->start + 1;
	info->mem[0].internal_addr = ioremap(regs->start, info->mem[0].size);
	...

and make sure that your resource end doesn't overlap with a start address
of an unrelated resource in your definition. /proc/iomem tends to be
useful for this.
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