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

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Date:	Tue, 15 May 2012 17:21:29 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Hannes Reinecke <hare@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH] EDD: Check for correct EDD 3.0 length

On Tue, May 15, 2012 at 03:18:49PM +0100, Alan Cox wrote:
> On Tue, 15 May 2012 17:12:14 +0300
> Gleb Natapov <gleb@...hat.com> wrote:
> 
> > On Tue, May 15, 2012 at 02:49:45PM +0100, Alan Cox wrote:
> > > > I do not see support for other spec to be important, but you are welcome
> > > > to write support for it if you need it. The only way I see to check what
> > > > spec edd info corresponds to is to calculate checksum according to both
> > > > specs and see which one succeeds.
> > > 
> > > No it doesn't work like that. This is a regression for existing working
> > > systems. It needs to be reverted or fixed. If it was a new feature you'd
> > > have a point - but it isn't. You've broken stuff, undo the breakage.
> > > 
> > Code never supported anything but EDD4.0 spec. I checked history git.
> > Code erroneously tried to interpret EDD3.0 info according to EDD4.0 spec
> > providing garbage as a result.
> 
> Providing some valid data and info, which has now disappeared.
> 
False. See my other mail:

# cat /sys/firmware/edd/int13_dev80/interface
SCSI            id: 0  lun: 1224979098644774912

This is what I got on my system. How is it useful?

> So I still think this is a regression. It wants fixing properly and that
> patch should be reverted until it has been done right.

--
			Gleb.
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