linux-kernel - Re: [PATCH] x86, efi: initial the local variable of DataSize to zero

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Date:	Fri, 3 May 2013 09:50:04 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
Cc:	matt.fleming@...el.com, mjg59@...f.ucam.org,
	linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Lee, Chun-Yi" <jlee@...e.com>, Matthew Garrett <mjg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86, efi: initial the local variable of DataSize to zero

On Thu, 02 May, at 10:07:01PM, Lee, Chun-Yi wrote:
> That will be better initial the value of DataSize to zero for the input of
> GetVariable(), otherwise we will feed a random value. The debug log of input
> DataSize like this:
> 
> ...
> [  195.915612] EFI Variables Facility v0.08 2004-May-17
> [  195.915819] efi: size: 18446744071581821342
> [  195.915969] efi:  size': 18446744071581821342
> [  195.916324] efi: size: 18446612150714306560
> [  195.916632] efi:  size': 18446612150714306560
> [  195.917159] efi: size: 18446612150714306560
> [  195.917453] efi:  size': 18446612150714306560
> ...
> 
> The size' is value that was returned by BIOS.
> 
> After applied this patch:
> [   82.442042] EFI Variables Facility v0.08 2004-May-17
> [   82.442202] efi: size: 0
> [   82.442360] efi:  size': 1039
> [   82.443828] efi: size: 0
> [   82.444127] efi:  size': 2616
> [   82.447057] efi: size: 0
> [   82.447356] efi:  size': 5832
> ...
> 
> Found on Acer Aspire V3 BIOS, it will not return the size of data if we input a
> non-zero DataSize.
> 
> Cc: Matthew Garrett <mjg@...hat.com>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
> ---
>  arch/x86/platform/efi/efi.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)

Applied, thanks.

-- 
Matt Fleming, Intel Open Source Technology Center
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