linux-kernel - Re: [PATCH] Fix EDD3.0 data verification.

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Date:	Wed, 02 Feb 2011 11:56:55 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH] Fix EDD3.0 data verification.

On 02/02/2011 09:59 AM, Gleb Natapov wrote:
> 
> Ah I see what length you were referring to params->device_path_info_length.
> If we will use that then we will get correct checksum for BIOSes that work
> according to phoenix spec too, but edd_show_interface() and edd_show_host_bus()
> handle only T13 spec so the information they show can be incorrect. I can
> change code to check that params->device_path_info_length == 44 in addition
> to checking csum. What do you think?
> 

Yes, you need to check both.

This is really a union of two similar-but-not-identical structures
distinguished by the length field.

	-hpa
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