linux-kernel - Re: [PATCH] EDD: Check for correct EDD 3.0 length

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Message-ID: <20120515111255.GJ32036@redhat.com>
Date:	Tue, 15 May 2012 14:12:55 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Hannes Reinecke <hare@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH] EDD: Check for correct EDD 3.0 length

Next time you resent an email say why you are doing it (wrong lkml
address in this case).

On Tue, May 15, 2012 at 01:04:49PM +0200, Hannes Reinecke wrote:
> The device_path_info_length for EDD 3.0 is 36, not 44.
> Cf http://mbldr.sourceforge.net/specsedd30.pdf.
> 
That's the wrong spec.

> This is a regression introduced by commit
> 0c61227094b3ddaca2f847ee287c4a2e3762b5a2
> 
> Signed-off-by: Hannes Reinecke <hare@...e.de>
> Cc: Gleb Natapov <gleb@...hat.com>
> Cc: H. Peter Anvin <hpa@...ux.intel.com>
> 
> diff --git a/drivers/firmware/edd.c b/drivers/firmware/edd.c
> index e229576..09a77d5 100644
> --- a/drivers/firmware/edd.c
> +++ b/drivers/firmware/edd.c
> @@ -545,8 +545,8 @@ edd_has_edd30(struct edd_device *edev)
>  	}
>  
>  
> -	/* We support only T13 spec */
> -	if (info->params.device_path_info_length != 44)
Here is the spec that code supports is spelled out, but you just replace
the comment with pointer to the spec that the code does not support.

> +	/* EDD 3.0 specifies this to be 36 */
> +	if (info->params.device_path_info_length != 36)
>  		return 0;
>  
>  	for (i = 30; i < info->params.device_path_info_length + 30; i++)

--
			Gleb.
--
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